Question 1

Which of the following statements best describes the difference between a strong acid and a weak acid in aqueous solution?

Accepted Answer

A strong acid completely dissociates in water, while a weak acid only partially dissociates.

Question 2

Given the reaction: $$2	ext{Fe}^{3+} + 2	ext{I}^- ightarrow 2	ext{Fe}^{2+} + 	ext{I}_2$$, which species is oxidized?

Accepted Answer

I$$^-$$

Question 3

A student dissolves 5.0 g of NaCl in 250 mL of water. What is the molarity of the resulting solution? (Molar mass NaCl = 58.44 g/mol)

Accepted Answer

$$0.34\ 	ext{M}$$

Question 4

Which of the following best explains why CH$$_3CH$_2OH ($$ethanol) is more soluble in water than CH$$_3CH$_2CH$_3 ($$propane)?

Accepted Answer

Ethanol can form hydrogen bonds with water, while propane cannot.

Question 5

Calculate the energy of a photon with a wavelength of $$4.0 	imes 10$$^{-7}$$ m. (h = 6.626$$ 	imes $$10^{-34} J$$·s, $$c = 3.00 	imes 10^8$ m/s)

Accepted Answer

$$4.97 	imes 10$$^{-19}$$ J

Question 6

Which intermolecular force is primarily responsible for the high boiling point of water?

Accepted Answer

Hydrogen bonding

Question 7

A reaction has the rate law $$	ext{rate} = k[	ext{A}]^2[	ext{B}]. If $$the concentration of A is doubled and B is tripled, by what factor does the rate increase?

Accepted Answer

12

Question 8

Which of the following is the correct electron configuration for a neutral potassium atom?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^6$$\ $$3s^2$$\ $$3p^6$$\ $$4s^1$$

Question 9

Which of the following changes will increase the equilibrium concentration of ammonia in the reaction $$N_2(g) + 3H_2(g$$) \rightleftharpoons 2NH_3(g)$$ (exothermic)?

Accepted Answer

Decrease the temperature

Question 10

A voltaic cell is constructed using a zinc electrode in a zinc sulfate solution and a copper electrode in a copper(II) sulfate solution. Which statement is correct?

Accepted Answer

Zinc is oxidized at the anode and copper is reduced at the cathode.

Question 11

Which of the following molecules has the highest dipole moment?

Accepted Answer

H$$_2O$$

Question 12

What is the pH of a 0.01 M HCl solution?

Accepted Answer

2

Question 13

Which of the following best describes the role of a buffer solution?

Accepted Answer

It resists changes in pH upon addition of small amounts of acid or base.

Question 14

Which of the following is the correct formula for the solubility product constant ($$K_{sp}) of $$calcium phosphate, Ca$$_3(PO$_4$$)$$_2$$?

Accepted Answer

$$K_{sp} = [Ca$$^{2+}$$]^3[PO_4$^{3-}]^2$$

Question 15

Which of the following is a correct statement about the activation energy of a reaction?

Accepted Answer

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

Question 16

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

Accepted Answer

$$CH_4 + 2O_2$$ \rightarrow $$CO_2 + 2H_2O$

Question 17

Which of the following is the correct expression for the equilibrium constant $$K_c$$ for the reaction $$N_2(g) + 3H_2(g$$) \rightleftharpoons 2NH_3(g)$$?

Accepted Answer

$$K_c = \dfrac{[NH_3$]^2}{[N_2$][H_2$]^3}$$

Question 18

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

Accepted Answer

It lowers the activation energy, increasing the reaction rate.

Question 19

Which of the following is the correct formula for calculating the work done by a gas during expansion at constant pressure?

Accepted Answer

$$w = -P\Delta V$$

General Chemistry: Structured Study Notes from Sample Exam Questions

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