According to Bohr's model of the atom, the energy of the photon involved in the transition of a hydrogen atom's electron from "n" is given by the equation:
E (n) = - [tex]\frac{1}{n^{2} }[/tex] . 13.6 eV
Here, "n" represents the shell number.
Bohr's model of hydrogen puts forward the assumption that the electrons revolve around the nucleus in specific orbits or shells.
Bohr explained the concept of energy of a photon in the hydrogen spectrum in terms of absorption and emission of photons by electrons, which leads to change in energy levels. The energy of a photon is given by the equation:
ΔE =hν
where, h is planck's constant whose value is 6.626 × 10⁻³⁴ Js
and ν is the frequency of the photon.
A drawback of Bohr's model is that it doesn't work for systems consisting of more than one electron.
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Which of the following is the correct Lewis structure for the molecule NH3?
N=H
Option 1
H-N-H
Option 3
-I
H
H=N:
Option 2
H-N-H
H
Option 4
The Lewis structure of ammonia, NH
3
, would be three hydrogen-bonded to a nitrogen atom in the middle, with a lone pair of electrons on top of the atom. This is the reason why ammonia acts as a Lewis base, as it can donate those electrons.
solution
OPTION 3 IS THE ANSWER
a 94.0 ml solution of 0.200 m of agno3 reacts with 195.0 ml solution of 0.201 m of nacl to produce silver chloride (agcl) and sodium nitrate (nano3) according to the balanced equationAgNO3 (aq)NaCI(aq) AgCl(s) NaNO3(aq) Determine the limiting reactant for the given reaction O NaCl O AgNO3 O AgCl O NaNO3
NaCl is the limiting reactant in the given reaction.
You must figure out how many moles of each reactant are present to identify the limiting reactant. Utilizing each solution's concentration and volume can help you achieve this.
You have a volume of 94.0 ml and a concentration of 0.200 M for the AgNO3 solution. The AgNO3 solution has a volume of 0.094 liters after being converted from milliliters to liters by dividing by 1000 ml/L. The number of moles of AgNO3 may then be determined by dividing the concentration by the volume:
moles AgNO3 = concentration × volume
= 0.200 M × 0.094 L
= 0.0188 moles
You have a volume of 195.0 ml and a concentration of 0.201 M for the NaCl solution. The NaCl solution has a volume of 0.195 L after being multiplied by 1000 ml/L to convert the volume to liters. The number of moles of NaCl may then be determined by dividing the concentration by the volume:
moles NaCl = concentration × volume
= 0.201 M × 0.195 L
= 0.0401 moles
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Why the sulphides precipitate of group IIA should be washed with distilled water and then centrifuged before addition of dilution solution of HNO3?
Because of the fact that certain ions and impurities are adsorbed on the precipitate's surface. Precipitate is washed with tap water in order to eliminate these contaminants since water will wash away any pollutants that are still soluble in it.
Why are ions formed?Ions are electrically charged particles that may be produced by either taking electrons away from neutrality atoms to form positive ions or adding electrons to neutral atom to form negative ions. The quantity of protons remains constant during the creation of an ion.
Are ions a form of energy?Negative ions are believed to trigger biochemical processes that enhance serotonin levels once they enter our blood, which helps to reduce depression, reduce stress, and improve energy.
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Write the corresponding section of mRNA produced from the following section of DNA template strands: a. 3’ C C G A A G G T T C A C 5’ b. 3’ T A C G G C A A G C T A 5’ 10. What amino acid is coded for by each of the following mRNA codons? a. CCA b. AAC c. GGU d. AGG e. UCU f. UUC g. CGG h. GCA
The mRNA sequence created by the template strand, 3' A T C G G T T A A C 5', and the coding strand, 5' T A G C C A A T T G, will be 3' G U U A A C C G A U 5'.
What strand is opposite the mRNA strand?The strand that is complementary to the mRNA is the lower strand. The transcriptional start site (the A) is marked on the coding strand together with the promoter sequence's -35 region (TTGACA) and -10 region (TATATT).
What does the mRNA strand's codon sequence represent?An individual amino acid is specified by each codon, which are groups of three nucleotides in mRNA.
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What is the concentration in ppb of sulfur atoms if 120.0g of water is mixed with 0.00005g of sulfur
Answer:
the ppb ratio of sulfur atoms is 1/250.
Explanation: i do math for livin cuh
a molecule of water contains hydrogen and oxygen in a 1:8 ratio by mass. this is a statement of . group of answer choices the law of conservation of mass the law of constant composition the law of conservation of energy none of the above the law of multiple proportions
A molecule of water contains hydrogen and oxygen in a 1:8 ratio by mass. this is a statement of the law of constant composition. Option B.
A water molecule is composed of hydrogen atoms and oxygen atoms bonded in a 2:1 ratio. Due to their fixed mass ratios, water molecules obey the law of constant proportions. Another example of a compound that obeys the law of constant ratios is methane.
To illustrate this, consider the production of water from molecular oxygen and hydrogen. Therefore mass is conserved. Conservation of mass can be used in chemical calculations. The law of conservation of mass states that matter cannot be created or destroyed.
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The Cori cycle is a metabolic pathway that involves active muscles and the liver. fatty acids glucose → glucose glycolysis → ATP gluconeo- genesis ATP CO2 + H2O lactate lactate LIVER MUSCLE Complete the sentences about the Cori cycle. Muscles break down into , which undergoes glycolysis. The end product of glycolysis in active muscles is , which is transported in the blood. The liver uses energy from to drive The produced in the liver is transported to the muscle in the bloodstream. Answer Banklactate pyruvate fatty acid oxidation glycolysis glycogen gluconeogenesis glucose
The process of moving lactate from cells that are engaged in anaerobic metabolism to the liver, where it is used to deliver glucose back to the cells, is known as the Cori cycle.
It serves as an illustration of one of the vital functions of the liver in ensuring that the body has an adequate supply of glucose. Gluconeogenesis has examples like the Cori cycle. It is true that the Cori cycle uses the liver's gluconeogenesis to change the lactate that muscles create into glucose. To be utilized by other cells throughout the body, this freshly created glucose is discharged into the blood. The Cori cycle, which transforms lactic acid into Glycogen, which can be used as a source of energy, prevents the excessive accumulation of lactic acid.
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Which of the following equations represents a reaction for which the standard entropy change is positive?
a) 3 O₂(g) --> 2 O₃(g)
b) 2 H₂(g) + O₂(g) --> 2 H₂O(l)
c) CaCO₃(s) --> CaO(s) + CO₂(g)
d) I₂(g) + 2 K(s) --> 2KI(s)
The correct response is A) The change in gaseous moles n g must be largest, indicating the formation of more gaseous products, which enhances unpredictability and, hence, entropy positive.
Entropy increases as a substance transitions from a solid to a liquid to a gas, and by observing the phases of the reactants and products, you can determine if an entropy change is positive or negative. Entropy will rise once the number of gas moles increases. The environment's negative entropy change is significantly outweighed by the system's positive entropy change. We can see that the system's entropy change is positive.
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a concept map for four types of intermolecular forces and a certain type of bond is shown. an ellipse is shown. inside the ellipse is written are ions present. an arrow from the right side of the ellipse has yes written on it and points to another ellipse. this ellipse has are polar molecules present written inside it. this ellipse has two arrows coming out of it. one arrow has yes written on it and leads to a rectangular box that has d written inside it. the second arrow has no written on it and leads to a rectangular box that has e written inside it. an arrow from the left of the topmost ellipse has no written on it and leads to an ellipse that has are molecules with permanent dipoles present written on it. an arrow that has no written on it, points from this ellipse towards a rectangle that has a written inside it. an arrow that has yes written on it, points from this ellipse towards another ellipse that has is h atom bonded to f, o, or n atom written on it. this ellipse also has two arrows coming from it. the arrow with yes written on it leads to a rectangle that has c written on it and the arrow that has no written on it leads to a rectangle that has b written inside it. which of the following correctly identifies the intermolecular force represented by a and compares its strength relative to the intermolecular force represented by b? a represents london dispersion forces, which are weaker than the force represented by b. a represents hydrogen bonding, which is weaker than the force represented by b. a represents london dispersion forces, which are stronger than the force represented by b. a represents hydrogen bonding, which is stronger than the force represented by b.
The letter A represents the dispersion forces as a kind of intermolecular force. Option A
What is a concept map?We know that a concept map can be regarded as the framework that is used to be able to organize facts and then be able to pass across an information. Thus a concept map is a tool that helps in the explanation of facts.
Given that we can see from the concept map that the compound is not composed of ions and there are no permanent dipoles that can be seen in the molecule, the simple meaning is that there is no kind of intermolecular interaction that involves the attraction of the oppositely charged ions in the compound and this would correspond to the dispersion forces.
In this kind of dipole attraction, it is the intermittent shifts in the electron cloud that leads to the attraction.
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Peripheral chemoreceptors are specialized cells in contact with arterial blood that respond directly to changes in blood ________.A) pHB) PO2C) PCO2D) PCO2 and PO2E) PO2, pH, and PCO2
Specialized cells called peripheral chemoreceptors in contact with arterial blood react immediately to variations in blood PO2.
Carotid and aortic bodies, which are peripheral chemoreceptors, sense changes in arterial blood oxygen levels and set off reflexes that are crucial for preserving homeostasis in hypoxemia. The carotid (and aortic) bodies, which act as peripheral chemoreceptors, recognise arterial hypoxia and promote breathing. They give the brain stem a constant excitatory input at normal arterial PO2 (PaO2) values (6), and in hypoxia, they react dramatically as PaO2 drops below 70 Torr. With some help from [H+], peripheral chemoreceptors are particularly sensitive to changes in PaO2. The peripheral chemoreceptor hypoxic response predominates in situations where the receptors disagree, such as hypoxic hypocapnia, causing the respiratory drive to increase oxygenation despite additional reductions in CO2.
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state amagats law of combining volume, giving both mathematical and graphical representation
According to the amagats law , the total pressure that is occupied by a gas is a sum of its partial volumes.
What is the volume of a gas?
We know that the volume of a gas has to do with the space that is being occupied by the gas. This is actually the physical space that has been taken up by the gas.
We know that a gas takes up the entire volume of the container. The volume of the container that is taken up by each of the gasses that can be found in a given mixture of gases is not the same.
As such we can be able to speak of the partial volume of a gas which is the space that the gas is able to take up in a mixture of gasses. This is the fraction of the volume of the container that has been occupied by the particular gas that is in question.
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Briefly describe each layer of Earth.
The layers of the earth include the following;troposphere, stratosphere, mesosphere, thermosphere, and exosphere. It's explanation will be discussed below.
What are the layers of the earth?The layers of the earth are grouped into five major layers that includes the following:
Troposphere: This is the layer of the earth that is closest to the earth's surface. It is characterized by having 78% nitrogen, 21% oxygen and remainder of trace gases (carbon dioxide, ozone, hydrocarbons, argon).
Stratosphere: This layers is located immediately above the troposphere. This layer is where ozone formation occurs and it's suitable for flying jets. It can be said that the stratosphere helps to protect us against ultraviolet rays of the sunlight.
Mesosphere: This is the layer found immediately above the stratosphere. This layer is characterized by having internal atmospheric gravity waves.
Thermosphere: This is the layer that is found immediately above the Mesosphere. It has the ability to absorb the sun's radiation.
Exosphere: This is the layer that is found immediately above the thermosphere. There is accumulation of the lightest gases such as hydrogen and helium in this layer.
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Correct the volume of 2.90 L of a gas at –12 °C to the volume occupied at 25 °C. Remember to convert between °C and K.
The volume occupied at 25 °C. Remember to convert between °C and K. V2 = 3.311 L is the correct answer.
What is volume?
Volume is a measure of the amount of space occupied by an object, or the amount of matter contained within it. It is measured in units such as cubic metres, cubic centimetres, litres, millilitres, etc. Volume is a three-dimensional concept, meaning that it requires three measurements to be taken in order to accurately measure the amount of space an object occupies. The volume of a solid object can be determined by applying the formula V = l x w x h, where l is the length, w is the width, and h is the height of the object. For a liquid or gas, the volume is calculated by measuring its mass and the density of the substance. Volume can also be used to describe the total amount of space something occupies, such as the volume of a room or the volume of a storage container.
Temperature and Volume equation
Given,
The volume at -12°C = 2.90L
Temperature, T1 = -12°C
= (-12°C + 273)
= 261K
And, Volume at 25°C = ?
(25°C + 273)K
= 298K
Now, by using this equation:-
V1/T1 = V2/T2
V2 = V1 x T2/T1
V2 = 2.90L x 298K/261K
V2 = 3.311L
Hence, The volume at 25°C will be 3.311L
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How many grams of calcium chloride will be produced when 27.0 g of calcium carbonate is combined with 11.0 g of hydrochloric acid?
Answer: To determine how many grams of calcium chloride will be produced when 27.0 g of calcium carbonate is combined with 11.0 g of hydrochloric acid, we can use the balanced chemical equation for the reaction:
CaCO3 + 2 HCl -> CaCl2 + H2O + CO2
From the equation, we can see that for every mole of calcium carbonate that reacts, one mole of calcium chloride is produced. We can use the molar masses of each compound to convert the number of grams of each reactant to moles, and then use the mole ratios from the balanced chemical equation to determine the number of moles of calcium chloride produced.
The molar mass of calcium carbonate is 100.09 g/mol, so 27.0 g of calcium carbonate is equal to 0.269 moles. The molar mass of hydrochloric acid is 36.46 g/mol, so 11.0 g of hydrochloric acid is equal to 0.302 moles.
From the balanced chemical equation, we can see that for every mole of calcium carbonate that reacts, two moles of hydrochloric acid are needed. This means that we have an excess of hydrochloric acid, and the limiting reactant in this reaction is calcium carbonate. Therefore, the number of moles of calcium chloride produced will be equal to the number of moles of calcium carbonate consumed, which is 0.269 moles.
To determine the mass of calcium chloride produced, we can multiply the number of moles of calcium chloride by its molar mass. The molar mass of calcium chloride is 110.98 g/mol, so the mass of calcium chloride produced is 0.269 moles * 110.98 g/mol = 29.8 g.
Therefore, when 27.0 g of calcium carbonate is combined with 11.0 g of hydrochloric acid, 29.8 g of calcium chloride will be produced.
Oil and methane hydrates are both physical ocean resources found beneath the seafloor. List two other similarities between oil and methane hydrates.
Crude oil is a mixture of nitrogen, sulphur, oxygen, and volatile hydrocarbons. Methane hydrate is a particular kind of clathrate made up of water and low molecular weight gases like methane.
Fossil deposits under the seafloor are what make up oil. It is an organic chemical that was created by the deposition of organisms on the seafloor. Additionally, methane hydrates are created after marine creatures deposit. Under the ocean's surface, one can find both oil and methane hydrates.
Similarities between both the Oil and methane hydrates are :
They both came from the ocean floor.They come from fossil fuels.They are created by decaying aquatic life.They are an energy source that is not renewable.They were mostly made of hydrogen and carbon.Both contribute to climate danger.Under high pressure and low temperature, they solidified.To learn more about Oil and methane hydrates refer here
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match each process of the nitrogen cycle with the form of nitrogen that is produced. labels may be used more than once.
Matching each process of the nitrogen cycle with the form of nitrogen that is produced is combustion: NO2; decomposition: NH4+; nitrogen fixation: NH4+; denitrification: N2; and nitrification: NO3-.
The nitrogen cycle refers to the biogeochemical cycle by which nitrogen is converted into multiple chemical forms as it moves among terrestrial, atmospheric, and marine ecosystems. It is a repeating cycle of processes during which nitrogen circulates through both living and non-living things: the atmosphere, soil, water, plants, animals, and bacteria. In order to move through the different parts of the cycle, nitrogen must change forms. The conversion of nitrogen can be carried out through both biological and physical processes. The nitrogen converts into NO2 through stationary combustion and into NH4+ through decomposition. Fixation converts nitrogen in the atmosphere into forms that plants produce i.e., NH4+. Denitrification is the process that converts nitrate to nitrogen gas, producing N2. Nitrification is the process that converts ammonia to nitrite and then to nitrate producing NO3-.
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Is this ammonia a polar or non polar molecule
the number of electrons in a neutral atom of an element is always equal to the of the element.
The number of electrons on a neutral atom is equal to the number of protons in the atom's nucleus, hence the answer is protons. This is referred to as the Z atomic number.
Atoms are neutral, hence there are exactly as many protons as electrons in each atom. All hydrogen atoms contain one electron, which is located outside the nucleus.
The number of protons and electrons in an atom's stable state is always equal to the atomic number. for a steady atom
Protons are positively charged and electrons are negatively charged. The number of electrons and protons in a neutral atom are always equal. The quantity of protons is constant.
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at a certain temperature, the equilibrium constant for the following reaction is : h2(g) cl2(g)use this information to complete the following table.
At a certain temperature, the equilibrium constant for the reaction is 263.16 or 2.6*10^2 and 5.5 * 10^-8.
1. K = ( HCl )^2 / (H2)*(Cl2)
As the value of K is very less so HCl is very less amount and H2 & Cl2.
2. 2HCl = H2 + Cl2 as the reaction is reverse so equilibrium value will be inverse.
K' = 1/K
= 1/ 0.0038
= 263.16 or 2.6*10^2
3. 3H2 + 3 Cl2 = 6 HCl
Reaction is multiplied by 3 so K will be Cube
K' = K^3
= (0.0038)^3
= 5.5 * 10^-8
Equilibrium, in physics, the state of a system when neither its state of motion nor its internal energy state tend to change over time. A simple mechanical body is in equilibrium when it experiences neither linear nor angular acceleration. This state will continue indefinitely unless disturbed by an external force.
Equilibrium occurs for a single particle when the vector sum of all forces acting on the particle is zero. A rigid body (which by definition differs from a particle by its properties of extension), in addition to the states listed above for particles, is in equilibrium when the vector sum of all torques acting on the body is equal to zero, so Its state of rotational motion remains constant.
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cobalt- is radioactive and has a half life of years. how much of a sample would be left after years? round your answer to significant digits. also, be sure your answer has a unit symbol.
Cobalt-60 is radioactive and has a half life of 5.26 years . amount of 3.60 mg sample would be left after 5.20 years is 1.82 mg.
The half-life t1/2 = 5.26 years
the decay constant , k = 0.693 / t1/2
= 0.693 / 5.26
= 0.1317 / year
the expression is given as :
t = 2.303 / k log No/N
No = 3.60 mg
t = 5.20 yr
5.20 = 2.303 / 0.1317 log 3.60 / N
5.20 = 17.4 log 3.60 / N
log 3.60 / N = 0.2988
3.60 / N = 1.989
N = 1.82 mg
The question is incomplete , the complete question is :
cobalt- is radioactive and has a half life of years. how much of a sample would be left after years? round your answer to significant digits. also, be sure your answer has a unit symbol.
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a buffer solution with a ph of 4.31 is prepared with 1.0 m hc2h3o2 and --------m nac2h3o2. the ka of hc2h3o2 is 1.8 x 10^-5.
The concentration of sodium acetate (NaC₂H₃O₂) in the buffer solution is: 0.029 M.
What is a buffer solution?A buffer solution is a solution that is resistant to changes in pH when small amounts of an acid or a base are added to it. It is able to do this because it contains both a weak acid and its conjugate base (or a weak base and its conjugate acid).
To determine the concentration of sodium acetate (NaC₂HO₂) in the buffer solution, you can use the Henderson-Hasselbalch equation:
pH = pKa + log([C₂H₃O₂-]/[HC₂H₃O₂])
where [C₂H₃O₂-] is the concentration of the acetate ion (the conjugate base of acetic acid) and [HC₂H₃O₂] is the concentration of acetic acid.
So, Plugging in the given values, we get:
4.31 = -log(1.8 x 10^-5) + log([C₂H₃O₂-]/1.0)
Solving for [C₂H₃O₂-] above, we see that it is = 0.029 M.
Since the concentration of sodium acetate is equal to the concentration of acetate ions, the concentration of sodium acetate in the buffer solution is also 0.029 M.
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See full question below
determine the concentration of sodium acetate (NaC₂H₃O₂)) in the buffer solution below.
a buffer solution with a ph of 4.31 is prepared with 1.0 m hc2h3o2 and --------m nac2h3o2. the ka of hc2h3o2 is 1.8 x 10^-5.
PLEASE HELP!!!
1. SEP Develop Models
Use the space to draw electron dot structures to model the bonding in calcium oxide (CaO), calcium chloride (CaCl₂), and potassium nitride (K₂N). As you develop your models, consider the following: Use the diagram for NaCl as a guide for your electron dot structures. After the bond is formed, each ion should have a complete outer electron shell, and the overall charge on the compound should be zero.
Answer:
Calcium Oxide must be Ionic, as we have one metal and one non metal involved. the metal is Calcium and the non metal is Oxygen. Meaning Calcium must be the one that transfers (loses) electrons to Oxygen, and Oxygen gains these electrons. It would look something like this:
Because Calcium transfers 2 electrons, it now has 2 more positively charged protons than the total number of electrons, as two electrons are lost. this means Calcium is no longer an atom, as it's positive protons and negative electrons can't cancel and make it neutral, it is now an ion, and a positively charged one at that. Same thing applies for Oxygen, but the opposite. because it has 2 more negative electrons than it's total of positive protons, it is now also an ion, and a negative one at that. The diagrams provided show the charges of the ions.
Potassium Nitrate must also be Ionic, for the same reason as before. the metal is Potassium and the non metal is Nitrogen. However, because Potassium is in Group 1, it only has 1 electron it can transfer to Nitrogen, but Nitrogen needs 2 electrons for a full outer energy level, therefore, we must have two Potassium atoms in this equation. It would look something like this:
Because there are two Potassium ions, each with a +1 charge, this means the overall charge of the Potassium ions is 2+, and this cancels out with the 2- provided by one ion of Nitrogen
which of the following is not a network solid? selected answer: correctc. co2(s) correct answer: correctc. co2(s)
We were aware that SiO2 is a network covalent solid and that CO2 is a molecular solid, but I'm not sure how I would go about determining that.
Each silicon and carbon have the same number of valence electrons, and they both contain two oxygen atoms. Because solid sulfur dioxide is a molecule and has covalent bonds, it is not a network solid even if it is a solid and has covalent bonds. An example of a network solid is diamond. One of the many forms of elemental carbon found in nature, diamond is an allotrope of carbon. On an atomic level, it resembles this. The carbon atoms are linked together by the lines.
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Which of the following is an observation of a chemical property?
Ozinc reacts with hydrochloric acid
density of wood is 0.51 g/cm³
water boils at 100°C.
sand paper is roughly textured
The right answer to the previous question and the correct observation of a chemical property is that zinc reacts with hydrochloric acid.
ZnCl2 +H2 = Zn +2HCL
Balanced equation:
ZnCl2 + H2 Zn + 2HCL
Zinc is a chemical element, designated by the symbol Zn and the atomic number 30. When the oxidation is removed, zinc turns shiny-greyish and at room temperature turns into a somewhat brittle metal.
All living things, including people, animals, plants, and microorganisms, depend on the trace metal zinc. It is the trace metal that is present in people in the second-highest concentration after iron. Zinc is an essential nutrient for development and a key cofactor for various enzymes. A lack of zinc can lead to a variety of diseases. Deficiency can lead to diarrhoea, infection susceptibility, and slower growth.
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Atoms will combine with each in order to become more chemically stable. Compound are formed between two atoms that hare outer energy levels. The two types of compounds that can be formed between atoms are ionic and covalent. Ionic compounds are formed between two nonmetal ion. Metals will lose electrons to form positive ions and nonmetals will gain electrons to form negative ions. These oppositely charge ions are very attracted to each other and form very strong bonds as a result. lonic compounds are characterized by crystalline structure, Two: or more pairs of electrons. The force of attraction between the nonmetals is relatively weak. Covalent compounds are characterized by i meting and boiling points and can be gases, liquids, or soft solids at room temperature.
The majority of stable atoms share electrons. When two atoms share electrons, they establish a covalent bond. The result of sharing electrons are molecules, which are neutral particles.
Why does an atom's outer energy level reach its maximum when it is full?Due to the fact that all orbitals will be filled, an entire octet is exceedingly stable. A process that increases the stability of the atoms will release energy in the form of heat or light because more stable atoms have less energy.
What increases an atom's stability?Whether or not an atom's outermost shell is filled with electrons determines how stable the atom is. The atom is stable if the outer shell is filled. Because they are unstable, empty outer shell atoms typically form chemical bonds.
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descrie what would happen in the follopwing situations. in the reaction h2so4 (aq) h hso4 the ph has been increased
The pH will decrease and goes in acidic sense in the following situations i.e. in the reaction of H2SO4 (aq) + HSO4.
Chemistry uses a scale known as pH, which formerly stood for "potential of hydrogen" (or "power of hydrogen"), to express how acidic or basic an aqueous solution is. Acidic solutions (solutions with higher H+ ion concentrations) have lower pH values than basic or alkaline solutions. The pH scale, which is logarithmic, exhibits an inverse relationship with the concentration of hydrogen ions in the solution. To trace the pH scale, a group of standard solutions whose pH has been established by international agreement can be employed. The potential difference between a hydrogen electrode and a standard electrode, such as the silver chloride electrode, is measured using a concentration cell with transference to obtain the primary pH standard values. The pH of aqueous solutions can be measured using a glass electrode, a pH meter, or a color-changing indicator. pH measurements are important in many fields, including chemistry, agronomy, medicine, water treatment, and many more.
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What is the mass of the oxygen used during the reaction? Iron (19.43) and iron oxide (20.91).
The mass of the oxygen used during the reaction is 8.16 g
What is oxygen ?The chemical element with the atomic number 8 and symbol O is called oxygen. It belongs to the periodic table's chalcogen group, is a very reactive nonmetal, and an oxidizing agent that easily produces oxides with most elements as well as other compounds.
The reaction is as follows ,
4Fe + 3 ⇒ 2
The molar ratio of the reaction
= 4:3
The four moles of Fe react with 3 moles of oxygen molecule to produced Iron Oxide .
The mole of iron = mass ÷ molar mass
= 19.43 g ÷ 55.845 g/mole
= 0.34 mole
If four moles of Fe react with 3 moles of oxygen molecule to produced Iron Oxide .
The number of moles of oxygen
= 3 moles × 0.34 mole ÷ 4 moles
= 0.22 mole
The mass
= 0.22 × 32
= 8.16 g
Thus, The mass of the oxygen used during the reaction is 8.16 g
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Copper is a metal that can behave like a magnet because
A. It has many magnetic domains oriented randomly
B. It has a very large magnetic domain pointing in a given direction
C. It is a conductor and can support electric current.
D. It has two large magnetic domains that always cancel each other out.
Copper is a metal that can behave like a magnet because It is a conductor and can support electric current.
What is a definition of metal?
Strong electrical and thermal conductivity, malleability, ductility, and high light reflection are all characteristics of metals, which are one type of materials.
Copper is not magnetic in and of itself. However, when a magnet comes close to copper (and some other metals), the magnetic field causes the copper's surface electrons to reorganize and start revolving. They generate resistance by rotating in a circular motion perpendicular to the magnetic field.
Copper has the highest conductivity among non-precious metals, which means it can carry more electrical current than other non-precious metals.
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Lithium oxide is used to absorb carbon dioxide:
Li2O(s) + CO2(g) → Li2CO3(s)
What volume of CO2 can 6.77 g of Li2O absorb if the CO2 pressure is 3.5 × 10−4 atm and the temperature is 295 K?
Answer:160 L of CO₂.
Explanation: Give me brainly please.
The volume of CO₂ absorbed is 0.371 L (or 371 mL) at 3.5 × 10⁻⁴ atm and 295 K.
To calculate the volume of CO₂ absorbed by 6.77 g of Li₂O, we need to use the ideal gas law, which states:
PV = nRT
where P is the pressure, V is the volume, n is the number of moles of gas, R is the ideal gas constant, and T is the temperature in Kelvin.
First, calculate the number of moles of CO₂:
Molar mass of Li₂O = 2 * (6.94 g/mol) + 15.999 g/mol ≈ 29.88 g/mol
Moles of Li₂O = 6.77 g / 29.88 g/mol ≈ 0.2263 mol
Now, we can use the given pressure and temperature:
P = 3.5 × 10⁻⁴ atm
T = 295 K
Rearrange the ideal gas law to solve for V:
V = nRT / P
V = (0.2263 mol) * (0.08206 L atm/mol K) * (295 K) / (3.5 × 10⁻⁴ atm)
V ≈ 0.371 L
So, the volume of CO₂ that 6.77 g of Li₂O can absorb at 3.5 × 10⁻⁴ atm and 295 K is approximately 0.371 L (or 371 mL).
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a valid lewis structure of cannot be drawn without violating the octet rule. group of answer choices nf3 so42- pf3 sbf3 if3
A valid lewis structure of cannot be drawn without violating the octet rule is IF₃.
According to the octet rule the atoms will be more stable if the valence electrons in the valence are eight electrons.
a) NF₃ = in the lewis structure of NF₃ the atom will contains the eight valence electrons in the valence shell. thus it follows the octet rule.
b) SO₄²⁻ = SO₄²⁻ , lewis structure follows the octet rule . atoms contains the eight valence electrons.
c) PF₃ = phosphorus valence electrons is 5 and the fluorine valence electron is 7 and fulfil the octet rule.
d) IF₃ = in the lewis structure IF₃ , it does not follows the octet rule . it contains the more than eight electrons .
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