Here's why:
* Mixtures are formed when substances are physically combined but not chemically bonded. The components retain their individual properties.
* Chemical reactions involve the formation of new substances with different properties than the original reactants.
When magnesium (Mg) reacts with water (H2O), they undergo a chemical reaction to produce magnesium hydroxide (Mg(OH)2) and hydrogen gas (H2). This reaction is represented by the following equation:
Mg + 2H2O → Mg(OH)2 + H2
The magnesium hydroxide formed is a solid, while hydrogen gas is a flammable gas. These are completely different substances than the original magnesium and water, indicating a chemical change has occurred.
