Q: Which of the following is the correct formula for calculating the enthalpy change ($$\Delta H) of a $$reaction using bond energies?

$$\Delta H = \text{(sum of bond energies of bonds broken)} - \text{(sum of bond energies of bonds formed)}$$

Question 1

Which of the following compounds has the greatest degree of unsaturation?

Accepted Answer

Cyclohexene ($$C_6H_{10})$$

Question 2

A hydrocarbon has the molecular formula $$C_8H_{14}. $$How many degrees of unsaturation does it have?

Accepted Answer

$$2$$

Question 3

Which of the following best describes the difference between a saturated and an unsaturated hydrocarbon?

Accepted Answer

Saturated hydrocarbons have no double bonds, while unsaturated hydrocarbons have one or more double bonds.

Question 4

What is the correct IUPAC name for the following compound: $$CH_2=$$CHCH_2CH_3$$?

Accepted Answer

1-butene

Question 5

Which of the following is the correct name for a compound with two double bonds at positions 1 and 3 in a five-carbon chain?

Accepted Answer

1,3-pentadiene

Question 6

Which of the following statements about the stability of alkenes is correct?

Accepted Answer

The more alkyl groups bonded to the sp$$^2$$ carbons, the more stable the alkene.

Question 7

Which of the following is a correct statement about the heat of hydrogenation of alkenes?

Accepted Answer

A lower heat of hydrogenation indicates a more stable alkene.

Question 8

Which of the following is a nucleophile?

Accepted Answer

$$Br^-$$

Question 9

Which of the following best describes the role of a catalyst in a chemical reaction?

Accepted Answer

It provides a pathway with a lower activation energy.

Question 10

Which of the following is the correct relationship between the standard free energy change ($$\Delta G^\circ) $$and the equilibrium constant ($$K_{eq}$$)?

Accepted Answer

$$\Delta G^\circ = -RT \ln K_{eq}$$

Question 11

A reaction has a large positive activation free energy ($$\Delta G$$^{\ddagger}$$). What does this imply about the reaction?

Accepted Answer

The reaction is kinetically slow.

Question 12

Which of the following best describes the transition state of a reaction?

Accepted Answer

It has partially formed and partially broken bonds.

Question 13

Which of the following factors will increase the rate of a chemical reaction?

Accepted Answer

Adding a catalyst.

Question 14

Which of the following is the correct rate law for a reaction that is first order in $$A$$ and second order in $$B$$?

Accepted Answer

$$	ext{rate} = k[A][B]^2$$

Question 15

Which of the following statements about the Arrhenius equation is correct?

Accepted Answer

The rate constant $$k$$ increases as temperature increases.

Question 16

Which of the following is the correct IUPAC name for the compound with the structure $$CH_2=$$CHCH_2CH_2CH_3$$?

Accepted Answer

1-pentene

Question 17

Which of the following is a correct statement about the mechanism of the addition of HBr to 2-butene?

Accepted Answer

The first step is the formation of a carbocation.

Question 18

Which of the following best describes the effect of increasing the concentration of reactants on the rate of a reaction?

Accepted Answer

It increases the rate.

Question 19

Which of the following is the correct formula for calculating the enthalpy change ($$\Delta H) of a $$reaction using bond energies?

Accepted Answer

$$\Delta H = 	ext{(sum of bond energies of bonds broken)} - 	ext{(sum of bond energies of bonds formed)}$$

Question 20

Which of the following is true about the naming of alkenes with substituents?

Accepted Answer

Substituents are listed in alphabetical order before the parent name.

Alkenes: Structure, Nomenclature, and Introduction to Reactions, Thermodynamics, and Kinetics

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