When magnesium hydroxide reacts with nitric acid, it produces magnesium nitrate and water.

Mg(OH)2 + 2HNO3 → Mg(NO3)2 + 2H2O

In one to two sentences, explain how this reaction demonstrates that matter is neither created nor destroyed in a chemical reaction.

This reaction demonstrates the law of conservation of matter because the number of atoms on each side of the equation remains the same, with two magnesium atoms, six hydrogen atoms, two nitrogen atoms, and six oxygen atoms on both sides.