(Solved): 7. Potassium and lithium both are reactive Group 1 metals. Both from hydrides, highly reactive comp ...

7. Potassium and lithium both are reactive Group 1 metals. Both from hydrides, highly reactive compounds. (Question \#20 on page 353) a. Potassium reacts with ${\mathrm{H}}_2$ to form potassium hydride, $\mathrm{KH}$. Write the balanced chemical equation. b. $\mathrm{KH}$ reacts with water to produce ${\mathrm{H}}_2$ and potassium hydroxide. Write the balanced chemical equation. c. Offer a reason why LiH (rather than $\mathrm{KH}$ ) has been proposed as a means of storing ${\mathrm{H}}_2$ for use in fuel cells.