Question

When baking soda is mixed with lemon juice, bubbles are formed with the evolution of a gas. What type of change is it? Explain. (2 marks)

Answer 1

• When baking soda is mixed with lemon juice, bubbles are formed with the evolution of carbon dioxide gas. (0.5 marks)
• Since the chemical composition of baking soda and lemon juice changes to produce new substances, this is a chemical change. (1.5 marks)

Lemon juice + Baking soda → Carbon dioxide + other substances