Question

Translate the following statements into chemical equations and balance them:

Potassium metal reacts with water to give potassium hydroxide and hydrogen gas.

• A. $2K\left(s\right)+2H_{2}O\left(l\right)\to 2KOH\left(aq\right)+H_2\left(g\right)$
• B. $2K\left(s\right)+2H_2\left(l\right)\to 2KOH\left(aq\right)+H_{2}O\left(g\right)$
• C. $2K\left(s\right)+2H_{2}O\left(l\right)\to K_{2}OH\left(aq\right)+H_2\left(g\right)$
• D. None of the above

Answer 1

The correct option is A $2K\left(s\right)+2H_{2}O\left(l\right)\to 2KOH\left(aq\right)+H_2\left(g\right)$

Potassium metal reacts very violently with water producing potassium hydroxide (KOH) and hydrogen gas.

$2K$ (s) + $2H_{2}O$ (l) $\to$ $2KOH\left(aq\right)$ + $H_2$ $\uparrow$ (g)

This reaction is exothermic and releases enough heat to ignite the resulting hydrogen.

Option A is correct.