Advertisements
Advertisements
Question
Melting of wax is a change where a solid changes to liquid state. Give one more such change which you observe in your surroundings
Advertisements
Solution
Melting of ice, melting of butter
APPEARS IN
RELATED QUESTIONS
How do the following help in bringing about a chemical change?
pressure.
MULTIPLE CHOICE QUESTIONS
Tick the most appropriate answer.
Miscible liquids having slightly different boiling points can be separated by the
- evaporation
- distillation
- fractional distillation
- sedimentation
FILL IN THE BLANK
........... electrolytes dissociate completely in aqueous state and allow large amount of electricity to flow through it.
Explain by writing a word equation.
Hard water gets softened on mixing with a solution of washing soda.
State the original colour of the following substance and colour of residue obtained after heating.
Lead nitrate
Give a word equation for the following reaction.
An exothermic reaction where both the reactants are gases, one of which is oxygen.
Higher order Thinking question
A very hot glass on putting in cold water cracks. What does this change indicate?
Give an example of a chemical reaction for the following situation:
A change in colour is observed
Assertion (A): Cutting paper into very small pieces is an irreversible change.
Reason (R): Physical changes are always reversible.
Collect information about the types of fuels used for cooking in your area. Discuss with your teachers/parents/others which fuels are less polluting and why.
