$$\Delta G = -100,000 - (298 \times 200) = -159,600 J/$$mol = -159.6$ kJ/mol

Question 1

Which of the following statements about Gibbs free energy ($$\Delta G) is $$correct?

Accepted Answer

A reaction with $$\Delta G \u003c 0 is $$spontaneous and does not require energy input from the surroundings.

Question 2

Which equation correctly relates Gibbs free energy, enthalpy, and entropy?

Accepted Answer

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

Question 3

A chemical reaction has $$\Delta H = -100 kJ/$$mol and $$\Delta S = +200 J/($$mol\cdot K). At $$T = 298 K$$, what is $$\Delta G$$ for the reaction?

Accepted Answer

$$\Delta G = -100,000 - (298 	imes 200) = -159,600 J/$$mol = -159.6$ kJ/mol

Question 4

Which of the following best describes the effect of a catalyst on a chemical reaction?

Accepted Answer

It lowers the activation energy and increases the rate of reaction.

Question 5

Which of the following is an example of a decomposition reaction?

Accepted Answer

$$AB \rightarrow A + B$$

Question 6

Which statement about reversible and irreversible reactions is correct?

Accepted Answer

Reversible reactions reach a point where the rates of the forward and reverse reactions are equal.

Question 7

Which of the following is the correct balanced equation for the combustion of methane?

Accepted Answer

$$CH_4(g) + 2O_2(g$$) \rightarrow $$CO_2(g) + 2H_2O(g$$)$$

Question 8

Which of the following best describes oxidation in an inorganic redox reaction?

Accepted Answer

Loss of electrons by an atom or ion.

Question 9

In the reaction $$4Fe(s) + 3O_2(g) \rightarrow 2Fe_2O_3(s)$$, which substance is oxidized?

Accepted Answer

Iron ($$Fe)$$

Question 10

Which of the following is true about organic oxidation and reduction?

Accepted Answer

Oxidation involves gaining oxygen or losing hydrogen atoms.

Question 11

Which of the following reactions is a condensation reaction?

Accepted Answer

Amino acid + Amino acid \rightarrow Dipeptide + H_2O

Question 12

Which of the following is a correct description of a hydrolysis reaction?

Accepted Answer

A molecule is split into two smaller molecules using water as a reactant.

Question 13

Which of the following best describes the effect of increasing temperature on the rate of a chemical reaction?

Accepted Answer

It increases the kinetic energy of reactant molecules, causing more frequent collisions and increasing the reaction rate.

Question 14

Which of the following is true about enzymes?

Accepted Answer

Enzymes are biological catalysts that increase reaction rates by lowering activation energy.

Question 15

Which of the following is an example of an organic addition reaction to an alkene?

Accepted Answer

$$CH_2$$=$$CH_2$$ + $$H_2$$ \xrightarrow{Ni} CH_3CH_3$$

Question 16

Which of the following correctly describes the major product of the hydration of 2-butene ($$CH_3CH=$$CHCH_3$$) in the presence of acid?

Accepted Answer

2-butanol ($$CH_3CH(OH)CH_2CH_3)$$

Question 17

Which nutrient provides the highest energy content per gram when metabolized in the body?

Accepted Answer

Fats (9 Cal/g)

Question 18

Which of the following is true about the activation energy ($$E_a) of a $$reaction?

Accepted Answer

It is the minimum energy required for reactants to collide and form products.

Question 19

Which of the following is a correct example of a synthesis reaction?

Accepted Answer

$$N_2 + 3H_2$$ \rightarrow 2NH_3$$

General Chemistry Study Guide: Thermodynamics, Kinetics, Chemical Reactions, and Organic Mechanisms

Study Guide - Practice Questions