1. What is the pH of a solution where [H3O+] is 3.5 x 10-5 M? 2. For the followi

Question

1. What is the pH of a solution where [H3O+] is 3.5 x 10-5 M?

2. For the following reaction, which reactant is acting as an acid? H2O + HCO3- <-> OH- + H2CO3

3. A solid sample at room temperature spontaneously sublimes, forming a gas. This change in state is accompanied by which of the changes in the sample?

a. Entropy increases (+) and heat (enthalpy) is released (-).

b.Entropy decreases (-) and heat (enthalpy) is released (-).

c. Entropy increases (+) and heat (enthalpy) is absorbed (+).

d. Entropy decreases (-) and heat (enthalpy) is absorbed (+).

4. P4 (s) + 10 Cl2 (g) --> 4 PCl5 (s) ?H = -435.2 kcal

a. Based on the reaction shown, which statement is true?

The reaction is exothermic.

The reaction absobs heat.

The reaction increases in entropy.

The reaction is endothermic.

5. In the balanced reaction shown, the mole ratio of Fe2S3 to SO2 is:

Fe2S3 + 4 O2 --> 2 FeO + 3 SO2

6.

a. Entropy increases (+) and heat (enthalpy) is released (-).

b.Entropy decreases (-) and heat (enthalpy) is released (-).

c. Entropy increases (+) and heat (enthalpy) is absorbed (+).

d. Entropy decreases (-) and heat (enthalpy) is absorbed (+).

Explanation / Answer

1) pH = -log[H3O+] = -log(3.5*10^-5) = 4.456

2) H2O

3) c. Entropy increases (+) and heat (enthalpy) is absorbed (+).

4) exothermic.

5) 1/3

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