Answer:
- 2K (s) + 2H₂O (l) → 2KOH (aq) + H₂(g)↑
Explanation:
<u>1) Word equation (given)</u>
<u>2) Kind of reaction</u>
- <em>Potassium</em> is an alkali metal.
This is a single replacement reaction.
Alkali metals is the group of metals in the group 1 of the periodic table. These are the most active metals, meaning that they react violently with water releasing hydrogen gas.
- Alkali metals can lose an electron to form compounds with oxidation number +1.
- The general equation for the reaction of an alkali metal and water is:
Metal + Water → hydroxide + gaseous hydrogen
X + H₂O → XOH(aq) + H₂ (g) ↑
<u>3) Chemical equation</u>
- K (s) + H₂O (l) → KOH(aq) + H₂(g)↑
<u>4) Balance</u>
- 2K (s) + 2H₂O (l) → 2KOH(aq) + H₂(g)↑
There is the same number of each atom on both sides: 2 K in the left and in the right, 4 H in the left and in the right, and 2 oxygen in the left and in the right. So, the equation is balanced.
