Answer:
Explanation: Using the idea of Dobereiner's triads, what conclusion could have been made about magnesium,
had beryllium and calcium already been discovered?
What is the difference between an exothermic and an endothermic reaction?
A. Endothermic reactions absorb heat.
B. Exothermic reactions absorb heat.
C. There are no changes in heat during either reaction.
D. Endothermic reactions release heat.
answer D
Explanation:hope thhis helped
please help with the attached picture question 21, 22, 23
Explanation:
21. The given molecule for cracking is tetradecane.
On cracking it forms one mole of decane (C10H22) and two moles of ethene gas.
The chemical equation is shown below:
[tex]C_1_4H_3_0->C_1_0H_2_2+2C_2H_4[/tex]
22. The essential condition for the formation of an ester is the reaction of alcohol and acid in presence of concentrated sulfuric acid.
Thus among the given options, the first option is the correct one.
23. Isomers of butanol are shown below:
It is 2-butanol.
The position of -OH group changes to the second carbon.
Select the structure corresponding to trans-3-octene.
Answer: B
Explanation:
Answer:
The Correct Answer Is B.
Calculate the molar mass of the following compound: Ca3P2
Answer:
The molar mass of the compound given is 182.182 g/mol.
Explanation:
To calculate the molar mass of the compound, we must multiply the number of moles of each element by the the individual molar mass of each element and add them together.
Let's start with Calcium. The molar mass of Calcium is 40.078. In this compound, we have three moles of Calcium, so we should multiply this number by 3.
40.078 g/mol * 3 mol = 120.234 g
Now, let's do the same for Phosphorus.
30.974 g/mol * 2 g/mol = 61.948 g
To find the molar mass of the entire compound, we should add these two values together.
120.234 g + 61.948 g = 182.182 g
Therefore, the correct answer is 182.182 g/mol.
Hope this helps!
Describe weighted average
Answer:
Explained below
Explanation:
In simple average, we just add all the given data variables and divide it by the number of data given.
However, when it comes to weighted average, what we do is that we multiply each given variable by their weights and then divide the sum of that by the sum of the weights.
Thus, if the variables are denoted by x and their weights are denoted by y, then we have;
Weighted average = Σ(xy)/Σy
A mixture of reactants and products for the reaction shown below is at equilibrium in a 5.0 L container what would most likely happen to the equilibrium if the volume of the container will reduced to 3.0 L?
Since the volume decreased, it means that the pressure is going to rise. Thus, the equilibrium of the reaction will shift in the direction that has the least amount of moles.
The statement, that describes the equilibrium "will change in the direction with the minimum moles."
What is an equilibrium?A condition of equilibrium has become one of balance. Chemical equilibrium is the state in which both the reactants and products are present in concentrations that have no further tendency to change with time, resulting in no observable change in the system's properties.
When volume decreases, the equilibrium shifts to favor the direction that produces fewer moles of gas. When the volume is raised, the equilibrium shifts in favor of the direction that produces the most moles of gas. Because the container's volume will be lowered from 5.0 L to 3.0 L, the pressure will rise. As a result, the equilibrium of the reaction will shift in the direction with the fewest moles. When the volume is reduced, the pressure rises. This demonstrates that a gas's pressure is inversely proportional to its volume.
Hence the correct answer is equilibrium will change in the direction with the minimum moles.
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its not a question but i wanted to tell you guys that if you guyz like my answers then please don't forget to give like and follow at the same time. I am not forcing you to follow only if you guyz like my answer then like or follow. THANKS FOR READING..
Answer:
thank you for this oibnki
Answer:
Sure I'll go ahead and like your answers and follow you if that's what you wanted! :)
Explanation:
. De las siguientes soluciones:
1. 20 ml de alcohol etílico mezcladas con 80 ml de agua.
2. 500 ml de agua con 20 g de sal disueltas (V Sln: 500ml).
3. 80 g de sal en 2 litros de agua.
a) Identifica el soluto y solvente de cada solución y explica ¿por qué?
b) Encuentra la concentración por peso de la solución número 3 c) Entre la disolución 2 y 3 ¿Cuál presenta mayor concentración?
por favor lo necesito para hoy ¡gracias!
Answer:
can u translate this to English? I might be able to help
a) Solution 1: Solute is ethyl alcohol, solvent is water. Solution 2 and 3: Solute is salt, solvent is water.
b) Concentration by weight of solution 3: Approximately 3.85%.
c) Solution 3 has a higher concentration than solution 2.
a) Solutions and their solutes and solvents:
Solution 1: The solute is ethyl alcohol, and the solvent is water. This is because ethyl alcohol is the substance that dissolves in water to form the solution.
Solution 2: The solute is salt, and the solvent is water. Salt is the substance that dissolves in water to form the solution.
Solution 3: The solute is salt, and the solvent is water. Similar to solution 2, salt is the substance that dissolves in water to form the solution.
b) Weight concentration of solution number 3:
The weight concentration is calculated by dividing the mass of the solute (80 g of salt) by the total mass of the solution (80 g of salt + 2000 g of water):
Weight concentration = (80 g / 2080 g) * 100% ≈ 3.85%
c) Comparison of concentrations between solution 2 and 3:
Solution number 3 has a higher concentration than solution 2, as the weight concentration of solution 3 is approximately 3.85%, while the exact amount of water is not provided for solution 2 to calculate its concentration. However, solution 2 contains only 20 g of salt dissolved in 500 ml of water, which implies that the concentration will be lower than solution 3. Therefore, solution number 3 has a higher concentration compared to solution 2.
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what is the organic molecule
Answer:
kinetic energy is the molecules
Explanation:
A molecule of the kind normally found in living systems. Organic molecules are usually composed of carbon atoms in rings or long chains, to which are attached other atoms of such elements as hydrogen, oxygen, and nitrogen.
Balance the following equations by inserting the proper coefficients.
The question is incomplete, the complete question is;
Balance the following equations by inserting the proper coefficients.
CH4 + O2 ---------------> CO2 +H2O
CaCl2 + AgNO3 ----->Ca(NO3)2 +AgCl
C2H6O + O2----------->CO2 +H2O
Answer:
CH4 + 2O2 ---------------> CO2 +2H2O
2AgNO3 + CaCl2 → Ca(NO3)2 + 2AgCl
C2H6O + 3O2 → 2CO2 + 3H2O
Explanation:
You see, when we set out to balance chemical reaction equations, ultimately, our aim is to ensure that the number of atoms of each element on the reactant side is exactly the same as the number of atoms of the same element on the products side.
We do this by counting the number of atoms required to have a balanced reaction equation and then adding coefficients in order to have a balanced chemical reaction equation.
This is what have been done in balancing the three reaction equations shown in the answer section.
Element X and Y are two different elements that are placed in the same group in the Periodic Table of Elements. Which of the following statements is correct about their atoms?
A Atoms of element X and Y have same number of electrons
B Atoms of element X and Y have different number of protons
C Number of neutrons for atom X and Y changes during formation of an ion
D Nucleon number for atom X and Y is the total number of protons and electrons
Answer:
A Atoms of element X and Y have same number of electrons
Re-word this statement: Ionic Radii are changing as you move down the column because the atoms in lower rows have more energy levels, which makes the valence electrons farther from the nucleus, so it takes less energy for them to be pulled away.
The Ionic radii are changing as you move across a row because each element has one more proton, which increases the attraction of the nucleus.
Answer:
ty po hehe
Explanation:
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the number of atoms in 2 moles of aluminium is if the 1mole is 6.022*10 the power of 23 or 10^23
Answer:
1.204 × 10²⁴ atoms
Explanation:
According to this question, one mole of aluminum (Al) atom contains 6.02 × 10²³ atoms.
If two moles of aluminum are given, this means that there will be 2 × 6.02 × 10²³ atoms of aluminum
2 × 6.02 × 10²3
= 12.04 × 10²³
= 1.204 × 10²⁴ atoms.
what do you mean by 1 joule work
Answer:
Joule is the SI unit of work. 1 Joule is amount of work done when a force of 1 Newton displaces a body through a distance of 1m in the direction of the force applied.
(06.01 MC)
Part 1. A glass bottle, which is half-filled with water, has a balloon attached to its
opening. The bottle is placed in a hot water bath for some time. Explain the change
to the size of the balloon based on the kinetic molecular theory.
Part 2. What would most likely happen to the balloon if the bottle was then placed
into a jar of cold water with ice cubes? Explain your answer based on the kinetic
molecular theory
In both cases, assume the balloon is attached tightly enough so that air does not
escape the system. (10 points)
Answer:
See explanation
Explanation:
According to the kinetic theory, a gas temperature is a measure of the average kinetic energy of the molecules of the gas. Thus, when the balloon is attached to the opening of a glass bottle placed in a hot water bath for some time, the molecules of the gas inside the balloon acquire greater kinetic energy and move faster. Hence, the molecules spread out and the gas expands - its size increases.
When the bottle is placed into a jar of cold water with ice cubes, the molecules of the gas loose energy and begin to coalesce. As a result of this, the volume of the gas decreases and the balloon shrinks. This is a demonstration of Charles law.
Answer:
According to the kinetic theory, a gas temperature is the measure of the average kinetic energy of the molecules of gas. Thus, when the balloon is attached to the opening of a glass bottle placed in a hot water bath for some time, the molecules of gas inside the balloon acquire greater kinetic energy thus moving faster. Hence, the molecules spread out and the gas expands thus expanding the balloon.
When the bottle is placed in a cold jar of cold water with ice cubes, the molecules of the gas loose energy thus decreasing the speed of the molecules within the gas. As a result of this, the size of the balloon should begin to shrink and so does the volume of the gas. Therefore, innately showing a demonstration of Charles' law of gasses which is the law that the volume of gasses is proportional to the temperature, (if the volume increases so does the temperature and vice versa).
Explanation:
I took the exam and go tthis question correct.
what is a measureing tape used for
Answer:
It is used to measure size or distance.
Answer:
it is used to measure long heights and distances and lengths,it is yellow and goes round
Explanation:
How many liters of carbon dioxide can be “scrubbed”, or removed, with 3.45 Liters of 0.10 M of lithium hydroxide solution?
Answer:
The correct answer is - 3.864 L of CO2.
Explanation:
Suppose that three isotopes of element X occur in nature as follows:
The relative atomic mass of the naturally occurring mixture of element X is
Answer:
107.5 amu
Explanation:
isotopes: fractional Wt Avg
isotopes: isotopic mass %Abundance abundance (amu)
X110 110 60 0.60 66.0
X105 105 30 0.30 31.5
X100 100 10 0.10 10.0
∑ atm mass contributions = 107.5 amu*
*amu = atomic mass units
Which of the following is not a pure form of a substance ?
A.Element
B.Atom
C.Molecule
D.Mixture
E.Compound
Answer:
Which of the following is not a pure form of a substance ?
C.mixture
Explanation:
since mixture is created due to one or more than two element,compound,molecule or atom.
Answer:
option D . mixture.
Explanation:
Mixture is not a pure form of a substance .
it is formed when two particles mixed together in one substance
Hope it is helpful to you ❣️✌️☺️☪️❣️
How much of a sample remains after five half-lives have occurred?
1/5 of the original sample
1/25 of the original sample
1/32 of the original gample
1/64 of the original sample
Answer:
1/32
Explanation:
Please help me with my work
Answer:
2
Explanation:
There's 2 Hydrogen and Chlorine molecules on the right side with one Zinc. So the left side needs to have a coefficient of 2 on the hydrochloric acid, or HCl.
What is the boiling point of water?
Answer:
212°F , 100°C , 373.15°K
They are all the same, in different units.
Answer:
The boiling point of water is 212 degrees fahrenheit, and/or 100 degrees celsius.
Fe2O3 +3CO--2Fe+3CO2 .identify the substance oxidized ,reduced and oxidizing agent and reducing agent
Answer:
Oxidized : CO
Reduced: Fe
Oxidizing agent: Fe2O3
Reducing agent: CO
Explanation:
Loss of electrons is oxidation while gaining of electrons is reduction.
CO is a reducing agent, Fe2O3 is an oxidizing agent.
Each carbon atom is oxidized in CO. CO is the reducing agent
Each Fe atom in FeO3 is reduced. FeO3 is the oxidizing agent
What happens to a glass of sugar solution when sugar is added to it?
The number of moles of water increases.
The number of moles of water decreases.
The molarity of the solution increases.
The molarity of the solution decreases.
When sugar is added to a glass of sugar solution, the molarity of the solution increases. Details about molarity can be found below, which is the third option.
What is molarity?Molarity is a term used to identify the amount of solute, in moles, dissolved in a solvent by volume. Molarity is expressed as moles per liter (mol/L).
However, molarity is directly proportional to the amount of solute in solution. This means that as the amount of solute increases, molarity also increases.
Therefore, when sugar is added to a glass of sugar solution, the molarity of the solution increases.
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Plz Help I have One more time To retake and I can't fail it..
Answer:
B. Radar uses radio and the siren uses sound waves. both exhibit in the Doppler effect.
sorry if this is wrong
Which molecule will have the strongest LDF
Answer: Try to get answer in Explanation
Explanation: Kr has a greater number of polarizable electrons (36 electrons), so Kr would have a greater degree of LDFs and therefore a greater melting point than N 2 (which has 7 × 2 = 14 polarizable electrons).
If the [OH1-] of a solution at 25oC is 5.8x10^(-5) mol/L, calculate the [H1+] in mol/L, the pH, and the pOH.
Answer:
1. [H⁺] = 1.58×10¯¹⁰ mol/L
2. pH = 9.8
3. pOH = 4.2
Explanation:
We'll begin by calculating the pOH of the solution. This can be obtained as follow:
Concentration of Hydroxide ion [OH¯] = 5.8×10¯⁵ mol/L
pOH =?
pOH = –Log [OH¯]
pOH = –Log 5.8×10¯⁵
pOH = 4.2
Next, we shall determine the pH of the solution. This can be obtained as follow:
pOH = 4.2
pH =?
pH + pOH = 14
pH + 4.2 = 14
Collect like terms
pH = 14 – 4.2
pH = 9.8
Finally, we shall determine the concentration of Hydrogen ion [H⁺] in the solution. This can be obtained as follow:
pH = 9.8
Concentration of Hydrogen ion [H⁺] =?
pH = –Log [H⁺]
9.8 = –Log [H⁺]
Multiply through by –1
–9.8 = Log [H⁺]
Take the anti log of –9.8
[H⁺] = antilog (–9.8)
[H⁺] = 1.58×10¯¹⁰ mol/L
SUMMARY:
1. [H⁺] = 1.58×10¯¹⁰ mol/L
2. pH = 9.8
3. pOH = 4.2
A piece of calcium metal was reacted with excess dilute acid to produce hydrogen gas. The gas was collected at SLC. If 4.58g of calcium reacted, what volume of hydrogen gas will be collected?
10g-4.58=4.42g volume of hydrogen gas
mention two factors which affect pressure due to liquid contained in a vessel
Answer:
depth of the liquid and nature of liquid affects the pressure due to liquid contained in a vessel
Answer:
Two factors influence the pressure of fluids. They are the depth of the fluid and its density. A fluid exerts more pressure at greater depths
I. En un laboratorio se hizo reaccionar una disolución de ácido sulfúrico (H2SO4) con otra de hidróxido de sodio (NaOH), ambos acuosos. Para formar sulfato de sodio (Na2SO4) y 2 moléculas de agua (H2O) líquido. Completa en relación con la ecuación química que representa la reacción:
Answer:
In a laboratory, a solution of sulfuric acid (H2SO4) was reacted with another of sodium hydroxide (NaOH), both aqueous. To form sodium sulfate (Na2SO4) and 2 molecules of liquid water (H2O). Complete in relation to the chemical equation that represents the reaction:
Explanation:
The balanced chemical equation of the reaction is:
[tex]H_2SO_4(aq)+2NaOH(aq)-> Na_2SO_4(aq)+2H_2O(l)[/tex]
Thus, one mole of sulfuric acid reacts with two moles of sodium hydroxide.
