Chapter 9, Problem 65A

Interpretation Introduction

(a)

Interpretation:

To write word equation for given skeleton equation.

$\text{Cu}\left(s\right)+{\text{O}}_2\left(g\right)\to \text{CuO}\left(s\right)$

Concept introduction:

Chemical equation is the symbolic description of a chemical reaction that products and reactants are indicating in terms of their chemical formula.

Explanation of Solution

The given skeleton equation is as follows:

$\text{Cu}\left(s\right)+{\text{O}}_2\left(g\right)\to \text{CuO}\left(s\right)$

Word equation for above skeletal equation is that combustion of copper solid in gaseous oxygen gives the formation of solid copper oxide.

(b)

Interpretation Introduction

Interpretation:

To write word equation for given skeleton equation.

$\text{K}\left(s\right)+{\text{H}}_{\text{2}}\text{O}\left(g\right)\to \text{KOH}\left(aq\right)+{\text{H}}_{\text{2}}\left(g\right)$

Concept introduction:

Chemical equation is the symbolic description of a chemical reaction that products and reactants are indicating in terms of their chemical formula.

Explanation of Solution

The given skeleton equation is as follows:

$\text{K}\left(s\right)+{\text{H}}_{\text{2}}\text{O}\left(g\right)\to \text{KOH}\left(aq\right)+{\text{H}}_{\text{2}}\left(g\right)$

Word equation for above skeletal equation is that on dropping solid potassium into liquid water gives potassium hydroxide and hydrogen gas.

(c)

Interpretation Introduction

Interpretation:

To write word equation for given skeleton equation.

${\text{CaCl}}_{\text{2}}\left(s\right)+{\text{Na}}_{\text{2}}{\text{SO}}_4\left(g\right)\to {\text{CaSO}}_{\text{4}}\left(s\right)+\text{NaCl}\left(aq\right)$

Concept introduction:

Chemical equation is the symbolic description of a chemical reaction that products and reactants are indicating in terms of their chemical formula.

Explanation of Solution

The given skeleton equation is as follows:

${\text{CaCl}}_{\text{2}}\left(s\right)+{\text{Na}}_{\text{2}}{\text{SO}}_4\left(g\right)\to {\text{CaSO}}_{\text{4}}\left(s\right)+\text{NaCl}\left(aq\right)$

Word equation for above skeletal equation is that sodium sulfate and calcium chloride undergo double replacement reaction and produce precipitate of calcium sulfate.