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Chemistry Cumulative Exam Questions and Answers 100% Pass
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Chemistry Cumulative Exam Questions and Answers 100% Pass How does pure water behave at 25°C? A. It undergoes ionization with the addition of an acid, establishing a state of equilibrium in which hydrogen ions and hydroxide ions are formed. B. It ionizes in the presence of acid, leading t...

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  • July 25, 2024
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  • 2023/2024
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Chemistry Cumulative Exam Questions
and Answers 100% Pass
How does pure water behave at 25°C?

A. It undergoes ionization with the addition of an acid, establishing a state of equilibrium in

which hydrogen ions and hydroxide ions are formed.

B. It ionizes in the presence of acid, leading to an equilibrium condition where the concentration

of hydrogen ions and hydroxide ions remains constant.

C. It experiences self-ionization, resulting in a balanced system where hydrogen ions and

hydroxide ions are present in equal amounts. ✔✔


D. It self-ionizes to reach an equilibrium state where there is a constant ratio of hydrogen ions to

hydroxide ions.




What does the notation (-Hfus) represent during a phase transition?

A. The formation of a gas.

B. The process of turning a gas into a liquid.


C. The creation of a solid from a liquid. ✔✔


D. The transformation of a liquid into a gas.




1

,What does the collision theory state about reactions?


- For a reaction to occur, particles must collide. ✔✔


- Successful collisions between particles can happen in any molecular alignment.

- An increase in temperature causes particles to lose kinetic energy.

- Reactions do not necessarily start with particle collisions.




In the equilibrium reaction: H₂ + I₂ + heat ⇌ 2HI, what effect will raising the temperature have

on the equilibrium?


- The equilibrium will shift to favor the formation of products, moving to the right. ✔✔


- An increase in temperature will not change the equilibrium.

- The equilibrium will shift to favor the reactants, moving to the left.

- The equilibrium will be permanently altered by the temperature change.




What is the initial step when a solute dissolves in a solvent?


- The solvent molecules are drawn to the surface particles of the solute. ✔✔


- The solute molecules are carried into the solvent.

- The solvent molecules encase the solute particles.


2

, - The solute behaves similarly to the solvent.




Smog is primarily composed of . After several intermediate reactions, what is the overall

chemical equation for smog?


✔✔D




According to collision theory, what is necessary to achieve a high number of effective collisions?

- Minimal force from colliding molecules.

- Minimal kinetic energy from colliding molecules.


- Collisions between molecules must occur with specific orientations. ✔✔


- Collisions must provide sufficient energy to surpass the activation energy.




Why is carbon-14 found in the molecules of all living organisms?

- The radioactive isotope reacts similarly to stable isotopes in the body’s nuclear reactions.

- The radioactive isotope reacts in the same manner as stable isotopes in the body’s chemical

reactions. ✔✔


- The radioactive isotope reacts more quickly than stable isotopes in nuclear reactions within the

body.

- The radioactive isotope reacts faster than stable isotopes in the body’s chemical reactions.

3

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