Class 8 Science – Chapter 4
Materials: Metals and Non-Metals
Page 3: Chemical Properties

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1️⃣ Chemical Properties

The properties that describe how a substance reacts with other substances are called chemical properties.

2️⃣ Reaction of Metals with Oxygen

Metals react with oxygen to form metal oxides.

Example:

Magnesium + Oxygen → Magnesium Oxide

Metal oxides are generally basic in nature.

3️⃣ Reaction of Non-Metals with Oxygen

Non-metals react with oxygen to form non-metal oxides.

Example:

Carbon + Oxygen → Carbon Dioxide

Non-metal oxides are generally acidic in nature.

4️⃣ Reaction with Water

• Some metals react vigorously with water (e.g., sodium, potassium).
• Some metals react slowly or not at all.
• Non-metals generally do not react with water.

⚠️ Safety Note: Sodium and potassium are stored in kerosene because they react violently with water.