Advertisements
Advertisements
Question
Distinguish physical and chemical changes.
Advertisements
Solution
1. Physical changes:
- No new substance is formed
- Reversible
- Change in physical properties like size, shape, state
- Melting of ice, tearing of paper freezing, evaporation vaporization
2. Chemical changes:
- New substance is formed
- Irreversible
- Change in properties of reactants and products
- Burning of paper, photosynthesis, digestion of food, rusting of iron
APPEARS IN
RELATED QUESTIONS
What do you observe when :
lighted match stick is brought near the mouth of the test tube containing hydrogen gas.
Tick (√) the correct alternative from the choice given for the following statement.
A substance which can not sublime is
Write true or false
Dissolving of solute in a solvent and rusting of iron are both physical changes.
Name two reversible changes.
State one instance where water undergoes a physical change and one in which it undergoes a chemical change.
Classify the following as a physical or a chemical change.
Boiling of water
Differentiate between a physical change and a chemical change with reference to – Nature of change is temporary and reversible or permanent and irreversible.
Select the chemical changes from the following list of changes
Butter turning rancid
Select the chemical changes from the following list of changes
Preparation of carbon dioxide from calcium carbonate & dilute hydrochloric acid.
You are given some candle wax. Can you make a candle doll from it? What kind of change is this?
