Question

1. why is baking a cake considered a chemical change? a) the cake batter just changes shape b) a new substance with new properties is formed c) it can be easily reversed d) it only involves melting

Explanation:

To determine why baking a cake is a chemical change, we analyze each option:

• Option a: Changing shape is a physical change (like molding clay), not chemical. So a is incorrect.
• Option b: In baking, ingredients (flour, eggs, etc.) react to form new substances (like the cooked cake structure) with new properties (e.g., taste, texture different from batter). Chemical changes involve new substance formation. This fits.
• Option c: Chemical changes are usually not easily reversed. Baking a cake can't be undone to get back the original batter, so c is wrong.
• Option d: Baking involves reactions (like protein denaturation, starch gelatinization), not just melting. Melting is physical, so d is incorrect.

Answer:

b) A new substance with new properties is formed