give reason for the following
a.the boiling of egg is a chemical change
b. the melting of wax is a physical change while burning of candle is a chemical change
Answers
Answer:
1. Boiling an egg is a chemical reaction. the heat taken in by the egg causes permanent changes to the molecular structure of the egg
2. The melting of the solid wax to form liquid wax and the evaporation of liquid wax to form wax vapour are physical changes. the burning of the wax vapour is a chemical change. the wax vapour reacts with oxygen in the air to form new substances including carbon dioxide and ash.
Answer:
Explanation:
a. when u boil an egg , both the white yolk and yellow yolk gets cooked and u cannot bring it back to a raw egg therefore it's a chemical change
b. when wax is melting , it changes it form from solid to liquid and when it cools down it again becomes solid this wax can be again remolded (we can bring back to its original form) therefore it is a physical change
when a candle is burnt it produces smoke which cannot be brought back to its original form therefore it's a chemical change
hope u understand