$$\Delta G = -100,000 - (298 \times 0.2) J = -100$$,059.6$ J

Question 1

Which of the following statements best describes an exothermic reaction?

Accepted Answer

It gives off heat to the surroundings, resulting in a negative $$\Delta H.$$

Question 2

Which equation correctly relates Gibbs free energy change ($$\Delta G) to $$enthalpy and entropy?

Accepted Answer

$$\Delta G = \Delta H - T\Delta S$$

Question 3

A reaction has $$\Delta H = -100 kJ $$and $$\Delta S = +200 J/K at$$ $$T = 298 K. $$What is $$\Delta G$$ for the reaction?

Accepted Answer

$$\Delta G = -100,000 - (298 	imes 0.2) J = -100$$,059.6$ J

Question 4

Which of the following factors will NOT increase the rate of a chemical reaction?

Accepted Answer

Decreasing the concentration of reactants

Question 5

Enzymes are biological catalysts. Which statement about enzymes is FALSE?

Accepted Answer

Enzymes are consumed during the reaction.

Question 6

Which of the following is a decomposition reaction?

Accepted Answer

$$AB \rightarrow A + B$$

Question 7

Combustion of glucose in the body is an example of which type of reaction?

Accepted Answer

Decomposition and oxidation-reduction

Question 8

Which statement about reversible reactions is correct?

Accepted Answer

At equilibrium, the rates of the forward and reverse reactions are equal.

Question 9

In an oxidation-reduction (redox) reaction, which species is the reducing agent?

Accepted Answer

The species that loses electrons

Question 10

Which of the following organic reactions produces water as a product?

Accepted Answer

Condensation

Question 11

During the hydrogenation of an alkene, what is added to the molecule?

Accepted Answer

Hydrogen ($$H_2)$$

Question 12

According to Markovnikov's rule, during the hydration of an asymmetric alkene, the $$-OH$$ group will bond to:

Accepted Answer

The carbon with more carbon groups

Question 13

Which of the following is TRUE about activation energy?

Accepted Answer

It is the energy required to start a reaction.

Question 14

Which of the following best describes an endergonic reaction?

Accepted Answer

It has a positive $$\Delta G$$ and requires energy input.

Question 15

Which molecule is the main energy carrier in living systems?

Accepted Answer

ATP (adenosine triphosphate)

Question 16

Which of the following is a correct example of an organic oxidation reaction?

Accepted Answer

Alcohol $$\rightarrow$$ Aldehyde

Question 17

Which statement about hydrolyzable lipids is correct?

Accepted Answer

They can be broken down into smaller molecules by hydrolysis.

Question 18

Which of the following is a correct general scheme for a double exchange reaction?

Accepted Answer

$$AB + CD \rightarrow AD + CB$$

Question 19

Which of the following statements about entropy ($$\Delta S) is $$TRUE?

Accepted Answer

A positive $$\Delta S$$ means the system becomes more random.

Question 20

Which of the following is NOT a function of a catalyst in a chemical reaction?

Accepted Answer

Is consumed during the reaction

Chapter 5: Chemical Reactions – Thermodynamics, Kinetics, and Reaction Types in GOB Chemistry

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