Question

Copper powder is taken in a china dish and heated over a burner.Name the product formed and state its colour. Write the chemical equation for the reaction involved.

Answer 1

Step 1: Identify the substance being heated
Copper powder (Cu) is taken in a china dish and heated in the presence of air (oxygen).

Step 2: Understand the reaction type
This is a combination reaction where copper reacts with oxygen from the air to form copper oxide.

Step 3: Identify the product and its colour
- The product formed is copper(II) oxide (CuO).
- It is a black-coloured powder.
- The brown colour of copper gradually turns black upon heating due to the formation of CuO.

Step 4: Write the chemical equation
2Cu (s) + O₂ (g) → 2CuO (s)

Final Answer:
- Product formed: Copper(II) oxide (CuO)
- Colour: Black
- Chemical equation: 2Cu (s) + O₂ (g) → 2CuO (s)