CHEMISTRY HIGH SCHOOL

Compared to pure water, an aqueous solution of calcium chloride has a(1) higher boiling point and higher freezing point
(2) higher boiling point and lower freezing point
(3) lower boiling point and higher freezing point
(4) lower boiling point and lower freezing point

Answers

Answer 1
Answer: Answer: option (2) higher boiling point and lower freezing point.


Explanation:


Colligative properties are those properties of solution that depend on the concentraion of the solute.


Increase of boling point and depression of freezing point are two of those colligative properties.


Regarding the boiling point, as some impurities (in this case the solute calcium chloride) are present in the solvent (water) ,at the same temperature, less molecules of water will reach the surface to escape, at a given temperature. Hence, you have to increase the temperature to manage that the number of molecules and their speed increase and so all the molecules can escape fro, the liquid phase to form the gas. So, the boiling point of the water with the salt in it will be higher than the boiling point of pure water.


As for the freezing point, in a solution the particles of solute interfere with the attractive forces between the molecules of water avoiding that the solvent passes to solid state at the normal freezing point. Hence, the temperature to freeze will be lower.

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If the solution process is endothermic, then an increase in temperature usually results in:an increase in solubility

a decrease in solubility

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Answers

If the solution process is endothermic, then an increase in temperature usually results in an increase in solubility. Their heat of reaction is usually positive. The rest of the choices do not answer the question above.

Answer:

solubility increases

Explanation:

A particle has 5 protons, 6 neutrons, and 5 electrons. What is its net charge.

Answers

It would have a zero charge because it is a neutral atom. The number of electrons which is a negative charge is equal to the number of protons which is positive, they will cancel each other out hence meaning it will become neutral

An element's atomic number is the A. weight of the atom.
B. sum of the protons and neutrons in an atom.
C. number of protons in an atom's nucleus.
D. mass of the atom

Answers

Answer:

C. number of protons in an atom's nucleus.

Explanation:

Atomic number : It is defined as the number of electrons or number of protons present in a neutral atom.

However, when we talk about the atomic number of the ion, it is not equal to the number of electrons as electron can be gained or loosed.

This is why, more appropriately, the number of the protons which are present in the nucleus of the atom is called the atomic number.

For example, Sodium has 11 protons in its nucleus which suggest that the atomic number of sodium is 11.
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Why do natural systems like the water in a pond rarely reach thermal equilibrium?

Answers

Final answer:

Natural systems like water in a pond rarely reach thermal equilibrium due to temperature differences and energy transfer limitations.

Explanation:

Natural systems like the water in a pond rarely reach thermal equilibrium due to various factors.

  1. One reason is the presence of temperature differences in different parts of the pond. For example, during the summer, the upper layer of water is warmed by the Sun and doesn't mix with deeper, cooler water, causing thermal stratification.
  2. Another reason is that energy transfer by heat requires a temperature difference. Once the two masses of water in the pond are mixed, there is no more temperature difference left to drive energy transfer by heat and do work.

These factors prevent the pond from reaching thermal equilibrium.

Learn more about thermal equilibrium here:

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I need to know the answer for number two. * I

Answers

Answer:

The answer to your question is (C). I would work out the question for you lad, but I don't know how to do it on here.

Explanation:

It is possible for the mass of the reactants to be greater than the mass of the products during _________.a. phase changes
b. fusion reactions
c. fission reactions
d. physical reactions E. chemical reactions

Answers

The correct answer is B. It is possible for the mass of the reactants to be greater than the mass of the products during fusion reactions. The mass of the products is less than the mass of the reactants because some of the mass has been converted to energy. Fusion reaction happens when two or more nuclei combine or collide to form an element with a higher atomic number. In this process, some of the matter of the fusing nuclei is converted to energy.
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