Q: How many molecules are present in 2.00 moles of water ($$H_2O$$)?

$$1.20 \times 10$$^{24}$$ molecules

Q: Which of the following acids is the strongest, based on the $$K_a$$ values provided?

Phosphoric acid ($$K_a = 7.5 \times 10$$^{-3}$$)

Question 1

Which of the following best describes a Bronsted-Lowry acid?

Accepted Answer

A substance that donates a proton.

Question 2

A chemical reaction is classified as exothermic if:

Accepted Answer

It releases heat to the surroundings.

Question 3

How many molecules are present in 2.00 moles of water ($$H_2O$$)?

Accepted Answer

$$1.20 	imes 10$$^{24}$$ molecules

Question 4

Which of the following reactions is a decomposition reaction?

Accepted Answer

$$2KClO_3 \rightarrow 2KCl + 3O_2$$

Question 5

A buffer solution can be made by mixing:

Accepted Answer

A weak acid and its conjugate base.

Question 6

Calculate the pH of a solution with $$[H_3O^+] = 2.5 	imes 10$$^{-4}$$ M.

Accepted Answer

Question 7

Which of the following best describes Le Chatelier’s Principle?

Accepted Answer

A system at equilibrium will shift to counteract any imposed change.

Question 8

Given the reaction $$N_2 + 3H_2$$ \rightarrow 2NH_3$$, how many grams of NH_3$ are produced from 14.0 g of N_2$ and excess H_2$? (Molar mass of N_2$ = 28.0 g/$$mol, $$NH_3 = 17.0$ g/mol)

Accepted Answer

17.0 g

Question 9

Which of the following is the correct formula for calculating the equilibrium constant $$K$$ for the reaction $$aA + bB \rightleftharpoons cC + dD$$?

Accepted Answer

$$K = \dfrac{[C]^c[D]^d}{[A]^a[B]^b}$$

Question 10

Which of the following is a structural isomer of butane ($$C_4H_{10}$$)?

Accepted Answer

Isobutane (2-methylpropane)

Question 11

Which of the following acids is the strongest, based on the $$K_a$$ values provided?

Accepted Answer

Phosphoric acid ($$K_a = 7.5 	imes 10$$^{-3}$$)

Question 12

Which of the following best describes the geometry around the carbon atom in ethene ($$C_2H_4$$)?

Accepted Answer

Trigonal planar

Question 13

A solution is prepared by mixing 0.50 mol of acetic acid ($$CH_3COOH) $$and 0.50 mol of sodium acetate ($$CH_3COONa) in 1.0 L of $$water. What is the pH of the solution? ($$pK_a of $$acetic acid = 4.74)

Accepted Answer

pH = 4.74

Question 14

Which of the following statements about hydrocarbons is true?

Accepted Answer

Alkynes contain a triple bond between carbon atoms.

Question 15

Which of the following best describes the process of neutralization?

Accepted Answer

A reaction between an acid and a base that produces water and a salt.

Question 16

If 0.10 mol of $$HCl is $$dissolved in enough water to make 1.0 L of solution, what is the concentration of $$H^+$$ ions?

Accepted Answer

$$0.10 M$$

Question 17

Which of the following is the correct expression for the dilution equation?

Accepted Answer

$$M_1V_1 = M_2V_2$$

Question 18

Which of the following would increase the rate of a chemical reaction?

Accepted Answer

Adding a catalyst

Question 19

Which of the following is the correct formula for calculating pH from $$[H_3O^+]$$?

Accepted Answer

$$pH = -\log [H_3O^+]$$

GOB Chemistry Exam 2 Study Guide: Chemical Reactions, Acids & Bases, and Hydrocarbons

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