High School Chemistry - Thermochemistry and Energetics

1

A reaction has an enthalpy change of and an entropy change of $108.7\frac{J}{K}$ .

At what temperature range will the reaction be spontaneous?

2

A reaction has an enthalpy change of and an entropy change of $108.7\frac{J}{K}$ .

At what temperature range will the reaction be spontaneous?

3

What can be said about the rates of exothermic and endothermic reactions?

4

What can be said about the rates of exothermic and endothermic reactions?

5

Which of the following is an example of an exothermic reaction?

6

Which of the following is an example of an exothermic reaction?

7

Which of the following statements is true?

8

Which of the following statements is true?

9

Consider these two half reactions:

Step 1. $CH_{4}_{(g)} + 2O_{2}_{(g)} \rightarrow CO_{2}_{(g)} + 2H_{2}O_{(l)}$ $\Delta H = -890kJ$

Step 2. $H_{2}O_{(l)} \rightarrow H_{2}O_{(g)}$ $\Delta H = 44kJ$

Based on these half reactions, find the enthalpy for the following reaction:

$CH_{4}_{(g)} + 2O_{2}_{(g)} \rightarrow CO_{2}_{(g)} + 2H_{2}O_{(g)}$

10

Consider these two half reactions:

Step 1. $CH_{4}_{(g)} + 2O_{2}_{(g)} \rightarrow CO_{2}_{(g)} + 2H_{2}O_{(l)}$ $\Delta H = -890kJ$

Step 2. $H_{2}O_{(l)} \rightarrow H_{2}O_{(g)}$ $\Delta H = 44kJ$

Based on these half reactions, find the enthalpy for the following reaction:

$CH_{4}_{(g)} + 2O_{2}_{(g)} \rightarrow CO_{2}_{(g)} + 2H_{2}O_{(g)}$

Thermochemistry and Energetics