Question 1

Which of the following molecules will boil at the highest temperature?

Accepted Answer

CH3CH2OH

Question 2

Which of the following forms of electromagnetic radiation has the lowest energy per photon?

Accepted Answer

radio waves

Question 3

A reaction is first-order in reactant A. If the initial concentration of A is doubled, what happens to the half-life of the reaction?

Accepted Answer

It is halved.

Question 4

Which of the following statements about London dispersion forces is correct?

Accepted Answer

Their strength is proportional to the polarizability of a molecule or ion.

Question 5

Which of the following electron transitions in the hydrogen atom emits radiation with the highest frequency?

Accepted Answer

$$n=4 	o n=2$$

Question 6

Given the reaction $$2\ \mathrm{C}_8\mathrm{H}_{18} + 25\ \mathrm{O}_2 \rightarrow 16\ \mathrm{CO}_2 + 18\ \mathrm{H}_2\mathrm{O}$$, if 14.08 g of $$\mathrm{CO}_2$$ are formed from 4.000 moles of $$\mathrm{C}_8\mathrm{H}_{18}$$ and 2.000 moles of $$\mathrm{O}_2$$, what is the percent yield?

Accepted Answer

12.50%

Question 7

Which of the following compounds exists as a pair of enantiomers?

Accepted Answer

2-bromobutanoic acid

Question 8

Which of the following statements about the molecular orbitals of $$\mathrm{N}_2 is $$incorrect?

Accepted Answer

$$\sigma_{2s} \u003c \sigma_{2p}$$

Question 9

Which of the following species has the greatest number of unpaired electrons?

Accepted Answer

N atom

Question 10

Which of the following best explains why but-2-ene exists as two isomers, but butane does not?

Accepted Answer

The $$\pi-$$bond in butene prevents free rotation about the C–C bond.

Question 11

Which of the following statements about the order of increasing ionization energy for the atoms neon, nitrogen, phosphorus, and sodium is correct?

Accepted Answer

Na \u003c N \u003c P \u003c Ne

Question 12

A 500 mg antacid tablet containing aluminum hydroxide and magnesium hydroxide is dissolved in 50.0 mL of 0.500 M HCl. The solution requires 26.5 mL of 0.377 M NaOH for neutralization. How many moles of $$\mathrm{OH}^-$$ were present in the tablet?

Accepted Answer

$$1.00 	imes 10$$^{-2}$$ mol

Question 13

Which of the following best describes the bond order of the C–O bond in the acetate ion ($$\mathrm{CH}_3\mathrm{COO}^-$$)?

Accepted Answer

1.5

Question 14

Which of the following molecules is chiral?

Accepted Answer

CH$$_3CH(OH)CH$_2CH$_3$$

Question 15

Which of the following statements about the effect of doubling the concentration of $$\mathrm{OH}^- in an$$ $$\mathrm{S_N1}$$ reaction is correct?

Accepted Answer

The rate will remain unchanged.

Question 16

Which of the following best explains why the Br–Br bond is weaker than the C–Br bond?

Accepted Answer

Br–Br is a bond between two large, diffuse orbitals, making it easier to break.

Question 17

Which of the following is the correct ground state electron configuration for $$\mathrm{Co}^{3+}$$?

Accepted Answer

$$[\mathrm{Ar}]\ 3d^6$

Question 18

Which of the following statements about the polarity of bonds is correct if the electronegativity difference between atoms in A–B is 1.5 and in C–D is 2.0?

Accepted Answer

The C–D bond has more ionic character than the A–B bond.

Question 19

Which of the following is the correct rate law for the reaction $$\mathrm{CH}_3\mathrm{I} + \mathrm{OH}^- \rightarrow \mathrm{CH}_3\mathrm{OH} + \mathrm{I}^-$$, given the following data: doubling $$[\mathrm{CH}_3\mathrm{I}]$$ doubles the rate, and doubling $$[\mathrm{OH}^-]$$ doubles the rate?

Accepted Answer

Rate = $$k[\mathrm{CH}_3\mathrm{I}][\mathrm{OH}^-]$$

Question 20

Which of the following best describes the maximum number of electrons that can exist in the $$n=3$$ shell of a single atom?

Accepted Answer

18

General Chemistry I: Step-by-Step Study Guidance for Sample Final Exam

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