Consider the combustion of methane (as represented by the following equation). This is the reaction that occurs for a Bunsen burner, which is a source of heat for chemical reactions in the laboratory.

$$\mathrm{CH}_4(g)+2 \mathrm{O}_2(g) \rightleftharpoons \mathrm{CO}_2(g)+2 \mathrm{H}_2 \mathrm{O}(g)$$

For the system at chemical equilibrium, which of the following explains what happens if the temperature is raised? a. The equilibrium position is shifted to the right, and the value for $K$ decreases.
b. The equilibrium position is shifted to the left, and the value for $K$ decreases.
c. The equilibrium position is shifted to the left, and the value for $K$ increases.
d. The equilibrium position is shifted, but the value for $K$ stays constant.

At a certain temperature the equilibrium constant $(K)$ for the following reaction is $9.00 \times 10^2$.

$$2 \mathrm{H}_2(g)+\mathrm{S}_2(g) \rightleftharpoons 2 \mathrm{H}_2 \mathrm{~S}(g)$$

It is found that $\left[\mathrm{H}_2\right]=0.010~M$ and $\left[\mathrm{H}_2 \mathrm{~S}\right]=0.15~M$. Calculate $\left[\mathrm{S}_2\right]$.

Consider the reaction as represented by the following equation.

$$\mathrm{N}_2(g)+3 \mathrm{H}_2(g) \rightleftharpoons 2 \mathrm{NH}_3(g)$$

Initially, $\left[\mathrm{N}_2\right]=5.00~M$ and $\left[\mathrm{H}_2\right]=4.00~M$. At equilibrium, $\left[\mathrm{H}_2\right]=1.00~M$ at a certain temperature. Determine the value for $K$ for this reaction at this temperature.

Explain how the concentration of hydronium ions and the concentration of hydroxide ions change when a base is dissolved in water.

Write a balanced chemical equation for the reaction of gaseous chlorine with solid sodium iodide where solid sodium chloride and iodine are formed.

What is meant by the term dynamic equilibrium?

Approximately $0.14 \mathrm{~g}$ of nickel(II) hydroxide, $\mathrm{Ni}(\mathrm{OH})_2(s)$, dissolves per liter of water at $20^{\circ} \mathrm{C}$. Calculate the $K_{s p}$ for $\mathrm{Ni}(\mathrm{OH})_2(s)$ at this temperature.

At the macroscopic level, a system at equilibrium appears to be unchanging. Is it also unchanging at the molecular level? Explain.

Determine a news article or research report that can be summarized with a two-way table similar to Table $1.1$. Draw a Venn diagram to represent the data in the table.

Find a news article or research report that can be summarized with a table similar to discussed tables. Draw a Venn diagram to represent the data in the table.

Balance the skeleton equations for the reactions. a. ammonium phosphate(aq) + chromium(III) bromide(aq) $\rightarrow$ ammonium bromide(aq) + chromium(III) phosphate(s). b. chromium(VI) hydroxide(s) $\rightarrow$ chromium(VI) oxide(s) + water(l). c. aluminum(s) + copper(I) chloride(aq) $\rightarrow$ aluminum chloride(aq) + copper(s). d. potassium iodide(aq) + mercury(I) nitrate(aq) $\rightarrow$ potassium nitrate(aq) + mercury(I) iodide(s).

Write skeleton equations for the following reactions. potassium iodide(aq) + mercury(I) nitrate(aq)$\rightarrow$ potassium nitrate(aq) + mercury(I) iodide(s)

Write skeleton equations for the following reactions. aluminum(s) + copper(I) chloride(aq) $\rightarrow$ aluminum chloride(aq) + copper(s)

Write skeleton equations for the following reactions. chromium(VI) hydroxide(s) $\rightarrow$ chromium(VI) oxide(s) + water(l)