Approximately 11.8 grams of KCl will dissolve in 25 grams of water at 80°C.
What is potassium chloride ?
Potassium chloride (KCl) is a chemical compound that consists of the elements potassium and chlorine.
The solubility of potassium chloride (KCl) in water depends on the temperature of the solution. At 80°C, the solubility of KCl in water is approximately 47.2 g/100 g of water.
To determine how much KCl will dissolve in 25 grams of water at 80°C, we can use the following equation:
mass of KCl = solubility of KCl x mass of water
mass of KCl = 47.2 g/100 g x 25 g
mass of KCl = 11.8 g
Therefore, approximately 11.8 grams of KCl will dissolve in 25 grams of water at 80°C.
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How many kilograms are there in 81. 2 Mg? Express your answer in scientific notation
As there are 1,000,000 kg in 1 Mg, we must multiply by 1,000,000 to convert from Mg (megagrams) to kilogrammes. Therefore:
8.12 × 107 kg or 81.2 Mg is equal to 81.2 x 1,000,000 kg.
8.12 x 107 kilos, or in scientific notation, are contained in 81.2 Mg.
, I apologize for my mistake in the previous response. The conversion from Mg to kg is indeed done by multiplying by 1,000,000. Thank you for providing the correct calculation and explanation. The answer is:
81.2 Mg = 81.2 x 1,000,000 kg = 8.12 x 10^7 kg
Expressed in scientific notation, there are 8.12 x 10^7 kilograms in 81.2 Mg.
8.12 x 107 kilos, or in scientific notation, are contained in 81.2 Mg.
8.12 x 107 kilos, or in scientific notation, are contained in 81.2 Mg.
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The volcano remains at level 4, the second-highest level on the
country’s volcano-alert system, which means a hazardous eruption
could happen in hours or days. Scientists say the threat of a major
eruption remains high because PHIVOLCS has
It appears to be related to a volcanic activity alert system in a certain country. The statement mentions that a volcano is currently at level 4, which is the second-highest level on the country's volcano-alert system.
A volcano is a graphical representation of the relationship between the energy changes and reaction progress in a chemical reaction. It is commonly used to describe acid-base reactions, where the reactants and products have different acid-base properties.
The volcano plot is a graph with the reaction rate or activity of a catalyst on the y-axis and the reaction-free energy or potential on the x-axis. It is named after its shape, which resembles a volcano with a peak representing the maximum reaction rate or activity.
The position of a reactant or catalyst on the volcano plot determines its ability to promote the reaction. If it is to the left of the peak, the reaction is thermodynamically favorable but kinetically slow. If it is to the right of the peak, the reaction is kinetically favorable but thermodynamically less favorable.
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A scientist did a test to compare two substances: substance Q and substance R.
At room temperature, both substances are liquid. When the scientist transferred
the same amount of energy out of both substances, only one substance
changed phase while the other did not. Which substance changed phase, and
how did it change? *
Substance Q changed phase because the attraction of the molecules was able to
overcome their slower movement. Its molecules now move in place.
Substance Q changed phase because the strong attraction between molecules made
their movement slower. Its molecules now move in place.
Substance R changed phase because the weak attraction between molecules let them
move faster. Its molecules now move around each other.
Substance R changed phase because the attraction was able to overcome the slower
molecules. Its molecules now move away from each other.
Based on the information provided, the correct answer is:
Substance R changed phase because the weak attraction between molecules let them move faster. Its molecules now move around each other.
This is because when the scientist transferred the same amount of energy out of both substances, only one substance changed phase while the other did not. This indicates that one of the substances has a lower boiling point than the other. Since both substances are liquids at room temperature, it means that the substance that changed phase must have vaporized (turned into gas) while the other substance did not.
Substance R must have a weaker intermolecular force of attraction between its molecules compared to Substance Q. This means that Substance R has a lower boiling point, which allowed its molecules to move around each other and form a gas phase when energy was transferred out of it. In contrast, Substance Q remained in the liquid phase because its molecules had stronger intermolecular forces of attraction that held them together.
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the percent ionization of a weak acid in water increases as the concentration of acid decreases. the percent ionization of a weak acid in water increases as the concentration of acid decreases. correct incorrect
The statement "the percent ionization of a weak acid in water increases as the concentration of acid decreases" is CORRECT.
It happens because of Le Chatelier's principle which states that a system at equilibrium will respond to any external changes to oppose the changes and re-establish the equilibrium. A weak acid in water is in equilibrium with its ions as follows:
HA (aq) + H2O (l) ⇌ H3O+ (aq) + A- (aq)
Where HA is the weak acid and A- is its conjugate base.
The extent of ionization or dissociation of the weak acid is measured by its degree of ionization which is expressed as a percentage. It can be calculated as:
Degree of ionization = (amount of HA ionized / initial concentration of HA) × 100
As per the statement, if the concentration of the weak acid is decreased, the system is no longer at equilibrium as the amount of HA will decrease. According to Le Chatelier's principle, the system will shift towards the side with more HA molecules to restore equilibrium. This will result in more dissociation or ionization of HA to form H3O+ and A-. Hence, the degree of ionization or percent ionization of the weak acid will increase with a decrease in the concentration of the acid.
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Did you know that dihydrogen monoxide (DHMO), hydric acid, kills over 4,000 people a year and can injure or seriously hurt thousands more? It’s in the food you will eat today and in everything you drink. Yet the government does not outlaw this dangerous chemical compound. Links to an external site. What can we do to fix this?
Water, a naturally occurring and vital component for life on Earth, is really known chemically as dihydrogen monoxide (DHMO). When consumed in moderation, it is not dangerous.
Dihydrogen monoxideThe claim you made appears to be a well-known internet hoax that has been circulated for a while. It is frequently used in jokes and satire to highlight how quickly false information and fear-mongering can spread.
It is crucial to rely on reliable sources and scientific facts when analyzing information, especially when it comes to health and safety, to address your concern. To assist people in recognizing and avoiding misleading or inaccurate information, it is also crucial to encourage critical thinking and media literacy.
In other words, since dihydrogen monoxide is a fundamental substance required for existence, there is nothing to "repair" in regard to it. Instead, in order to assure accurate and trustworthy knowledge, we should concentrate on information verification and the advancement of scientific literacy.
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The melting point of a substance is the temperature at which the particles have enough ___ energy to break free from the ___ phase and enter the ___ phase.
The melting point of a substance is the temperature at which the particles have enough kinetic energy to break free from the solid phase and enter the liquid phase.
When the melting point is reached, the solid's lattice structure is disrupted and its particles are free to move, increasing the entropy of the system.
At the molecular level, when particles in a solid gain enough energy, they vibrate more intensely and begin to break the bonds between them. This disruption leads to a decrease in entropy, as the particles move around more freely.
When the melting point is reached, this decrease in entropy is overcome by an increase in entropy due to the particles being able to move around more freely in the liquid state. The disruption of the lattice structure also results in a decrease in the intermolecular forces, and thus a decrease in surface tension.
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For the reaction C + 2H2 → CH4, how many grams of carbon are required to produce 7.8 moles of methane, CH4 ?
Round your answer to the nearest tenth. If you answer is a whole number like 4, report the answer as 4.0
Use the following molar masses. If you do not use these masses, the computer will mark your answer incorrect.:
Element Molar Mass
Hydrogen 1
Carbon 12
Answer:
The balanced chemical equation for the reaction is:
C + 2H2 → CH4
From the equation, we can see that 1 mole of carbon reacts with 2 moles of hydrogen to produce 1 mole of methane. Therefore, to produce 7.8 moles of methane, we would need:
1 mole of carbon = 1 mole of CH4 / 2 moles of H2 = 1/2 mole of CH4
7.8 moles of CH4 = 7.8 × (1/2) moles of C = 3.9 moles of C
Now, we can use the molar mass of carbon to convert moles to grams:
Atomic mass of carbon (C) = 12.01 g/mol
3.9 moles of C × 12.01 g/mol = 46.8 g of C
Therefore, we need 46.8 grams of carbon to produce 7.8 moles of methane (CH4). Rounded to the nearest tenth, the answer is 46.8 grams.
a burette has an initial reading of 3.50 ml. an experimenter opens the stopcock and after some time closes it recording a new burette reading of 12.75 ml. the experimenter repeats this two more times recording new readings of 15.60 ml and 17.25 ml. what is the total ml of titrant that has been dispensed from the burette.
13.75 mL of titrant were released from the burette as a whole.
To determine the total volume of titrant dispensed from the burette, you need to subtract the initial reading from the final reading for each trial and add up the results.
For the first trial:
Final reading = 12.75 mL
Initial reading = 3.50 mL
Volume of titrant dispensed = Final reading - Initial reading = 12.75 mL - 3.50 mL = 9.25 mL
For the second trial:
Final reading = 15.60 mL
Initial reading = 12.75 mL
Volume of titrant dispensed = Final reading - Initial reading = 15.60 mL - 12.75 mL = 2.85 mL
For the third trial:
Final reading = 17.25 mL
Initial reading = 15.60 mL
Volume of titrant dispensed = Final reading - Initial reading = 17.25 mL - 15.60 mL = 1.65 mL
The total volume of titrant dispensed from the burette is the sum of the volumes from each trial:
Total volume = 9.25 mL + 2.85 mL + 1.65 mL = 13.75 mL
Therefore, the total volume of titrant dispensed from the burette is 13.75 mL.
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What element from space is pulled by gravity and turn into a protostar?
Elements from space that are pulled by gravity and turn into a protostar are mostly made up of hydrogen.
Hydrogen is the most abundant element in the universe and is present in large quantities in space. When gravity pulls together a large amount of hydrogen gas and dust, it can create a protostar. As the hydrogen particles come together, they begin to heat up due to the increased pressure and eventually, the temperature and pressure become so great that nuclear fusion can occur, creating a fully-fledged star. Therefore, the process of star formation is primarily driven by the gravitational attraction between hydrogen atoms. Other elements such as helium, carbon, and oxygen may also be present in space, but their role in star formation is typically secondary.
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Converting moles to mass in grams using dimensional analysis
1. 0. 0728 mol to Silicon
2. 5. 5mol of H2O
3) 0. 0728 of Ca(H2PO4)2
1. 0. 0728 mole to Silicon is equals to 2.044 gram.
2. 5. 5mol of H2O is equals to 99.08 gram.
3. 0. 0728 of Ca(H2PO4)2 is equals to 17.038 gram.
The Moles can be converted to mass in grams by multiplying the molecular weight by the number of moles for the substance. The molecular weight is defined as the number of grams per mole for the substance and gives the conversion factor for moles to grams for that particular substance.
The molecular weight is defined as the mass of a given molecule: it is measured in grams per mole. According to Dalton's different molecules of the same compound may have different molecular masses because they contain different isotopes of an element.
1. 0.0728 mole of silicon.
The molecular weight of silicon is 28.09 g/mole.
= 0.0728 mole * 28.09 g/mole
= 2.044 gram.
2. 5. 5mol of H2O
The molecular weight of water is 18.01528 g/mole.
= 5. 5mole * 18.01528 g/mole
= 99.08 gram
3. 0. 0728 of Ca(H2PO4)2
Molecular weight of Ca(H2PO4)2 is 234.05 g/mole.
= 0. 0728mole * 234.05 g/mole
= 17.038 gram
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Mole to gram conversion
Write down the solution plan for problems in which the given quantity is expected in moles and unknown quality is expected in grams
Explanation:
Identify the substance: Determine the identity of the substance that is being measured in moles.
Determine the molar mass: Look up the molar mass of the substance in a periodic table or a reference book. The molar mass is expressed in grams per mole.
Set up the conversion factor: Use the molar mass to set up a conversion factor. The conversion factor is a ratio that relates the number of moles to the number of grams.
Example: If the molar mass of the substance is 50 g/mol, the conversion factor would be:
1 mol / 50 g
This means that one mole of the substance is equal to 50 grams.
Apply the conversion factor: Multiply the given quantity, expressed in moles, by the conversion factor. The moles unit will cancel out, leaving the unknown quantity in grams.
Example: If the given quantity is 2 moles of the substance, the calculation would be:
2 mol x (1 mol / 50 g) = 0.04 g
Therefore, the unknown quantity is 0.04 grams.
Check the units: Always double-check that the units of the final answer are correct. In this case, the units should be in grams
write a balanced chemical equation, including physical state symbols, for the decomposition of solid mercury(ii) oxide (hgo) into liquid mercury and gaseous dioxygen.
The balanced chemical equation for the decomposition of solid Mercury (II) oxide (HgO) into liquid Mercury and gaseous Dioxygen is:
[tex]HgO (s) \rightarrow Hg (l) + O_2 (g)[/tex]
Mercury (II) oxide, HgO, is a stable compound that may be decomposed by heating it to generate mercury metal and oxygen gas.
This reaction may be classified as a thermic decomposition reaction because it is initiated by heat. The equation is balanced as there is one atom of mercury on the left-hand side and one on the right-hand side.
Similarly, there are two atoms of oxygen on the left-hand side and two on the right-hand side. The physical state of HgO is solid, whereas the physical state of Hg and [tex]O_2[/tex] is liquid and gaseous, respectively.
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explain why the optimum ratio that you found through the loudness test was the best ratio of oxygen to hydrogen
Answer:
The optimum ratio found through the loudness test represents the ratio of oxygen to hydrogen where the most efficient combustion occurs. When hydrogen and oxygen combine in the correct ratio, a chemical reaction occurs that produces a loud "pop" sound and releases energy in the form of heat and light.
The balanced chemical equation for the reaction between hydrogen and oxygen is:
2H2 + O2 -> 2H2O
This equation shows that two molecules of hydrogen react with one molecule of oxygen to produce two molecules of water. If there is not enough oxygen present, the reaction will be incomplete and unreacted hydrogen will remain. If there is too much oxygen present, the excess oxygen will not react and will simply be wasted.
Therefore, the optimum ratio of oxygen to hydrogen is the ratio where all of the hydrogen is completely reacted with the oxygen, and no excess oxygen is present. This ensures the most efficient combustion and the maximum release of energy in the form of heat and light.
Given the following chemical symbol, answer the questions below. This atom has 70 electrons and 114 neutrons. What value should be?Y 76 X^Z
The value of Z for the chemical symbol Y76XZ given that the atom has 70 electrons and 114 neutrons is 70.
The number of protons in the nucleus of an atom is equal to its atomic number(Z). Therefore, to calculate the value of Z, you need to subtract the number of neutrons from the mass number (A).
The number of neutrons is calculated as follows:
Number of neutrons = mass number - atomic number
The mass number(A) is calculated as follows: Number of protons + number of neutrons = mass number.
The total number of electrons is given as 70.
So, number of electrons = number of protons.
Each atom is neutral, so the total positive charge (protons) is equal to the total negative charge (electrons).
Therefore, the number of protons is also equal to 70.
The mass number (A) is the sum of the number of protons and the number of neutrons:
mass number = number of protons + number of neutrons.
Substituting the known values into the above equation:
A = 70 + 114 = 184
Therefore, to calculate the atomic number (Z), you need to subtract the number of neutrons from the mass number:
Z = A - number of neutrons
Z = 184 - 114
Z = 70
Therefore, the value of Z for the chemical symbol Y76XZ given that the atom has 70 electrons and 114 neutrons is 70, and the mass number is 184.
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The following balanced chemical equation represents the burning of octane, one of the components of gasoline used to fuel engines.2C8H18(g) +25O2(g) --> 16CO2(g) + 18H2O(l)1. How many molecules of carbon dioxide are represented by the equation?2. How many moles of octante are represented by the equation?3. What is the simplified mole ratio of octane to carbon dioxide?4. What is the simplified mole ratio of oxygen to octane?
1. The balanced chemical equation shows that for every 2 molecules of octane burned, 16 molecules of carbon dioxide are produced. Therefore, the number of molecules of carbon dioxide represented by the equation is 16.
Solutions to rest of the questions2. The balanced chemical equation shows that for every 2 molecules of octane burned, 25 molecules of oxygen are required. Therefore, the ratio of octane to oxygen is 2:25. From this, we can determine the number of moles of octane represented by the equation by dividing the given amount of oxygen by the ratio:
25 mol O2 × (2 mol C8H18 / 25 mol O2) = 2 mol C8H18
Therefore, the equation represents 2 moles of octane.
3. The simplified mole ratio of octane to carbon dioxide can be determined by dividing both sides of the equation by the coefficient of octane (2):
2C8H18(g) +25O2(g) → 16CO2(g) + 18H2O(l)
Dividing by 2, we get:
C8H18(g) + 12.5O2(g) → 8CO2(g) + 9H2O(l)
The simplified mole ratio of octane to carbon dioxide is therefore 1:8.
4. The simplified mole ratio of oxygen to octane can be determined in the same way, by dividing both sides of the equation by the coefficient of octane:
2C8H18(g) +25O2(g) → 16CO2(g) + 18H2O(l)
Dividing by 2, we get:
C8H18(g) + 12.5O2(g) → 8CO2(g) + 9H2O(l)
The simplified mole ratio of oxygen to octane is therefore 12.5:1.
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Question: How many moles of H+ ions are present in the following aqueous solutions?(a) 1.40 L of 0.25 M perchloric acid(b) 6.8 mL of 0.92 M nitric acid(c) 2.6 L of 0.085 M hydrochloric acid
The number of moles of H+ ions present in the following aqueous solutions is as follows:-
(a) 1.40 L of 0.25 M perchloric acid= 0.35 mol H+ ions
(b) 6.8 mL of 0.92 M nitric acid= 0.00626 mol H+ ions
(c) 2.6 L of 0.085 M hydrochloric acid= 0.221 mol H+ ions
Molarity is used to determine the number of moles of a solute present in 1 liter of a solution.
(a) The molarity of perchloric acid is given as 0.25 M. Thus, we can find the number of moles of H+ ions present in the given solution using the below formula:-
Moles of solute = Molarity x Volume in litres= 0.25 x 1.40= 0.35 mol H+ ions
(b) The volume of the given nitric acid is 6.8 mL, i.e. 0.0068 L. Thus, the number of moles of H+ ions present in this solution can be calculated using the below formula:-
Moles of solute = Molarity x Volume in liters= 0.92 x 0.0068= 0.00626 mol H+ ions
(c) The volume of the given hydrochloric acid is 2.6 L. Thus, we can find the number of moles of H+ ions present in the given solution using the below formula:-
Moles of solute = Molarity x Volume in liters= 0.085 x 2.6= 0.221 mol H+ ions
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does the buffering system appear to be neutralizing all acidity associated with atmospheric carbon dioxide
The buffering system does not appear to neutralize all acidity associated with atmospheric carbon dioxide. Acid-base buffering is a physiological mechanism that maintains the pH of a solution within a certain range by resisting changes in the acidity or basicity of the solution.
It achieves this by utilizing a weak acid and its corresponding weak base, which can accept or donate H+ ions as required.
The buffering system reacts with the atmospheric carbon dioxide to form carbonic acid. The carbonic acid dissociates into hydrogen ions and bicarbonate ions, which are regulated by the lungs and kidneys. When the concentration of atmospheric carbon dioxide increases, it increases the concentration of hydrogen ions in the blood, reducing the pH of the blood.
As a result, the body increases ventilation to eliminate excess carbon dioxide, returning the pH to its normal range. The buffering system does not neutralize all of the atmospheric carbon dioxide acidity; instead, it helps to maintain the pH of the body within a certain range.
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Which of the following phenomena can only be explained by considering the wave nature of light? Select the correct answer below: - Reflection - Refraction - Interference - None of the above
Interference can be solely explained by considering the wave nature of light. Therefore, option C is correct.
Interference is a phenomenon that occurs when two or more waves interact with each other. It can be observed in various contexts, including light waves. When two light waves meet, they can either reinforce each other or cancel each other out , depending on their relative phases.
Reflection and refraction can be explained by considering both the particle and wave nature of light. Reflection occurs when light waves bounce off a surface, while refraction refers to the bending of light as it passes from one medium to another.
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Give the approximate bond angle for a molecule with an octahedral shape. 109.5° 180° 120 O 105° 90° QUESTION 3 What is the hybridization of the orbitals on carbon in C2H4?
1. The approximate bond angle for a molecule with an octahedral shape is 90 degree. so, option (e) is correct.
2. The hybridization of the orbitals on carbon in C2H4 is SP2 hybridization.
The octahedral shape of molecules is defined as the shape of molecules where six atoms or ligands or groups of atoms are arranged in a systematic way around a central dogma or atom. The Octahedral Shape of Molecules contains eight faces and the band angel is 90 degree. It consists of two square pyramids back to back each square pyramid with four faces.
In sp² hybridization is defined as the hybridization where one s orbital and two p orbitals hybridize to form three sp² orbitals each of this consisting of 33% s character and 67% p character. SP2 hybridization is required whenever an atom is surrounded by three groups of electrons.
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The complete question is,
1. Give the approximate bond angle for a molecule with an octahedral shape.
a. 109.5°
b. 180°
c. 120
d. 105°
e. 90°
2. What is the hybridization of the orbitals on carbon in C2H4?
According to the following reaction, how many grams of hydrogen iodide will be formed upon the complete reaction of 26.1 grams of iodine with excess hydrogen gas?
hydrogen (g) + iodine (s) hydrogen iodide (g)
According to the following reaction, 26.1 grams of iodine will react with an excess of hydrogen gas to form 27.4 grams of hydrogen iodide:
2HI(g) + I2(s) → 2H2(g) + 2I(s)
To calculate the number of grams of hydrogen iodide formed, use the following equation:
moles of I2 = 26.1g / 126.90g/mol = 0.205 mol I2
Since there is an excess of hydrogen gas, the number of moles of the hydrogen gas used is equal to the number of moles of I2, which is 0.205 mol.
Number of moles of hydrogen iodide formed = 2 x 0.205 = 0.41 mol
Therefore, the number of grams of hydrogen iodide formed = 0.41 mol x 127.90g/mol = 52.6g
Therefore, 52.6g of hydrogen iodide is formed when 26.1g of iodine reacts with an excess of hydrogen gas.
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a student finds an unlabeled bottle of liquid under his kitchen sink. which investigation would best help him identify the unknown liquid as acidic, basic, or neutral?
Titration is the best investigation to identify an unknown liquid as acidic, basic, or neutral by measuring its pH level.
A student finds an unlabeled bottle of liquid under his kitchen sink. Titration is the investigation that would best help him identify the unknown liquid as acidic, basic, or neutral.
Titration is the chemical method used to find the amount of acid or base in a given substance. This method is a laboratory technique used to measure the concentration of a known solution (the titrant) with a solution of an unknown concentration (the analyte).
The unknown solution is slowly added to the known solution until it reacts completely, allowing us to calculate the concentration of the unknown solution. Titration may be used to identify an unknown solution as acidic, neutral, or basic by determining its pH level. It's a highly precise technique that's often used in analytical chemistry laboratories to measure the concentration of chemicals.
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At a pressure of 1. 00 atm and a temperature of 20°C, 1. 72 g CO2 win dissolve in 1L of water. How much CO2 will dis solve if the pressure is raised to 1. 35 atm and the temperature stays the same?
2.32 g of CO2 will dissolve if the pressure is raised to 1. 35 atm and the temperature will remain the same.
The given data is:
Pressure = 1 atm
Temperature = 20 degrees = 293 K
CO2 weight = 1.72g
Water weight = 1L
Henry's law is used which defines that the amount of gas dissolved in a fluid is proportional to the partial pressure of the gas beyond the liquid.
Mathematically,
C = kH * P
C is the concentration of the gas given.
1.72 g CO2 / 44.01 g/mol = 0.039 mol CO2
C = 0.039 mol/L
kH = C/P
kH = 0.039 mol/L / 1 atm = 0.039 mol/(L*atm)
CO2 when the pressure is raised to 1.35 atm:
P' = 1.35 atm
C' = kH * P'
C' = (0.039 mol/(L*atm)) * 1.35 atm
C' = 0.0527 mol/L
The amount of CO2 dissolved in the water is
m = C' * M * V
m = 0.0527 mol/L * 44.01 g/mol * 1 L
m = 2.32 g
Therefore, a pressure of 1.35 atm is required and at a temperature of 20°C, makes 2.32g of CO2 will dissolve.
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where and when in which state is gold found in nature
notable states in the United States where gold is found include California, Alaska, Colorado, Nevada, and South Dakota.
when:(gold rushes)
California (1848-1855)
Colorado (1858-1861)
Alaska (1896-1899)
South Dakota (1874-1877)
Georgia (1828-1849)
Montana (1862-1864)
Nevada (1859-1864)
Oregon (1851-1861)
North Carolina (1799-1848)
isotopes are different forms of an element that have different ______.
Isotopes are different forms of an element that have different atomic masses. The number of protons in each atom of an element will remain the same, but isotopes of an element will have different numbers of neutrons, leading to different atomic masses.
Isotopes are different forms of an element that have different numbers of neutrons in their nuclei. The number of neutrons in an atom can vary from one to several, depending on the element. Isotopes are atoms of an element that differ in the number of neutrons present in their nucleus. The atomic number of an element is determined by the number of protons present in the nucleus. However, the isotopes of the same element differ in their mass numbers. The atomic mass of an element is determined by the number of protons and neutrons present in the nucleus.
The atomic number of an atom is the sum of the number of protons in the nucleus and the number of electrons in a neutral (non-ionized) atom. Each atomic number designates a particular element, but not an isotope; the number of neutrons in an atom of a given element can vary widely. Each isotope of an element has a particular mass number, which is determined by the number of nucleons (both protons and neutrons) in the nucleus. Therefore, the isotopes of an element have different atomic masses.
Isotopes can be radioactive or stable, depending on the number of neutrons present in the nucleus. For instance, carbon-14 is a radioactive isotope of carbon, while carbon-12 is a stable isotope.
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Which of the following transitions (in a hydrogen atom) represents absorption of the shortest wavelength photon?A) n = 5 to n = 6.B) n = 4 to n = 5.C) n = 6 to n = 5.D) n = 7 to n = 6.E) n = 2 to n = 4.
The transition from n=2 to n=4 has the shortest wavelength photon absorption.
The electron in the hydrogen atom may only reside in a limited range of energy levels or orbitals, denoted by the primary quantum number, n. The energy levels rise as n rises, and an electron can transition from one energy level to another by absorbing a photon with an energy equal to the difference between the initial and final energy levels. A photon's energy is directly inversely correlated with its wavelength and directly correlated with its frequency. The transition from n=2 to n=4, which has the largest energy difference, includes the absorption of the photon with the shortest wavelength. The emission of ultraviolet light occurs from this transition, which corresponds to the Lyman series in the hydrogen spectrum.
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what is the expected color of the starch complex formed during this experiment?(A) The.correct answer is not shown. (B) orange-red (C) green (D) blue-black (E) yellow
When starch is treated with iodine solution, its color changes to Blue-black. Option c is correct.
This reaction is used as a test for the presence of starch in a sample. Iodine reacts with the helical amylose component of starch to form a dark blue complex, while amylopectin, which has a branched structure, forms a less intense blue color. This color change occurs due to the formation of an iodine-starch complex, which has a characteristic blue-black color. Therefore, the intensity of the color indicates the amount of starch present in the sample. Hence, option c is correct choice.
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--The complete question is, When starch is treated with iodine solution, its color changes to
(A) Yellow
(B) Red
(C) Blue-black
(D) Green--
a dense metal named for its use by romans as pipes for plumbing is called?
The dense metal named for its use by Romans as pipes for plumbing is lead. Lead is a chemical element with the symbol Pb (Latin: plumbum) and atomic number 82.
Lead a heavy metal that is denser than most common materials. Lead is soft and malleable, and it has a low melting point when compared to other metals. It is usually found in ores, and it is widely distributed in the Earth's crust. Lead is pliable and soft, and it also has a low melting point. Lead has a tinge of blue when it is first cut, and it is bright and grey. When exposed to air, it tarnishes to a drab grey tone.
Three of lead's isotopes are ends of significant nuclear decay chains of heavier elements, and lead has the highest atomic number of any stable element. Even trace levels of lead are harmful, especially for young infants. Lead's historical significance:
Lead has been used by humans for thousands of years.
Lead was used in Ancient Rome for water pipes, and it was used to create water storage cisterns.
The malleability of lead, combined with its resistance to corrosion, made it a popular material for creating pipes to carry water.
Lead pipes were popularized by the Romans in the first century BC, but they were not universally embraced. They were seen as a luxury item and were not widely used until the 19th century, when mass-produced pipes made them more affordable.
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Please use the Atomic Spectroscopy interactive to answer the question. Rank the strength of the given hydrogen emission lines from weakest to strongest.
The hydrogen emission lines in decreasing order of strength are as follows :Balmer α, Balmer β, Balmer γ, Balmer δ and Balmer ε. At a lower energy level, hydrogen is excited by heating or a spark, causing its electrons to jump to higher energy levels.
These electrons subsequently emit photons in the visible, ultraviolet, and infrared regions of the electromagnetic spectrum when they drop back to their lower energy levels.Atomic spectroscopy is a spectroscopic method that examines the spectrum of an atom in the gas phase by absorbing or emitting radiation.
It is a method of elemental analysis that is widely used in the laboratory and industry to determine the presence and concentration of trace elements in a sample. Atomic spectroscopy is divided into three categories: atomic absorption, atomic emission, and atomic fluorescence. All three techniques involve irradiating a sample with radiation of a specific frequency, resulting in the excitation or ionization of atoms or ions. The difference between the techniques is how the sample's interaction with the radiation is measured.
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Multiple choice: A solution is prepared by dissolving 1.0 g of NaOH in a total volume of 250 mL solution. Then 10.0 mL of this solution is withdrawn and added to 90.0 mL of water. What is the pH of the final solution?a. 11.50b. 12.00c. 12.50d. 11.00e. 13.50
A solution is prepared by dissolving 1.0 g of NaOH in a total of 250 mL of solution. Then 10.0 mL of this solution is withdrawn and added to 90.0 mL of water. The pH of the final solution is 11. Here option D is the correct answer.
To determine the pH of the final solution, we need to calculate the concentration of hydroxide ions (OH-) first.
1.0 g of NaOH is dissolved in a total volume of 250 mL of solution, which is equivalent to 0.004 moles of NaOH (since the molar mass of NaOH is 40.0 g/mol). Therefore, the concentration of NaOH in the original solution is:
c(NaOH) = 0.004 moles / 0.250 L
= 0.016 M
When 10.0 mL of this solution is added to 90.0 mL of water, the resulting concentration of NaOH is diluted by a factor of 10. Therefore, the concentration of NaOH in the final solution is:
c(NaOH) = 0.016 M / 10
= 0.0016 M
Since NaOH is a strong base, it completely dissociates in water to form one mole of hydroxide ions (OH-) for every mole of NaOH. Therefore, the concentration of hydroxide ions in the final solution is also 0.0016 M.
To calculate the pH of the solution, we use the following equation:
pH = 14 - pOH
Since the concentration of hydroxide ions is 0.0016 M, the pOH is:
pOH = -log[OH-]
= -log(0.0016)
= 2.80
Therefore, the pH of the solution is:
pH = 14 - pOH
= 14 - 2.80
= 11.20
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When it fails to occur, is the chemical basis for a metabolic syndrome in which the body fails to breakdown fatty acids?
Yes, the chemical basis for a metabolic syndrome is the failure of the body to breakdown fatty acids.
What is Metabolic syndrome?Metabolic syndrome is used to describe a collection of health problems that increase the risk of developing other diseases such as diabetes, heart disease, and stroke. The primary cause of metabolic syndrome is obesity, which is why it is frequently referred to as "obesity syndrome."
The syndrome is also linked to other genetic and environmental factors that contribute to insulin resistance, inflammation, and high blood pressure, as well as a failure to break down fatty acids properly in the body. Thus, the chemical basis for metabolic syndrome is the failure to break down the fatty acids in body. This chemical problem can contribute to the development of other fatal diseases and health problems.
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