Why is burning of a fuel a chemical change?

Important Questions on Physical and Chemical Changes

MEDIUM

7th ICSE

IMPORTANT

FRANK NEW CERTIFICATE - Chemistry>Chapter 2 - Physical and Chemical Changes>EVALUATION>Q 3

Give one example of a chemical change in which heat is liberated.

EASY

7th ICSE

IMPORTANT

FRANK NEW CERTIFICATE - Chemistry>Chapter 2 - Physical and Chemical Changes>EVALUATION>Q 4

Define sublimation. Give two examples of substances that show sublimation.

EASY

7th ICSE

IMPORTANT

FRANK NEW CERTIFICATE - Chemistry>Chapter 2 - Physical and Chemical Changes>EVALUATION>Q 1

With the help of an activity, explain the type of change where energy is absorbed.
 

EASY

7th ICSE

IMPORTANT

FRANK NEW CERTIFICATE - Chemistry>Chapter 2 - Physical and Chemical Changes>EVALUATION>Q 2

Why is condensation a physical change? Explain with the help of an activity.
 

EASY

7th ICSE

IMPORTANT

FRANK NEW CERTIFICATE - Chemistry>Chapter 2 - Physical and Chemical Changes>EVALUATION>Q 3

Not all physical changes can be reversed. Give a suitable example to support the statement.

EASY

7th ICSE

IMPORTANT

FRANK NEW CERTIFICATE - Chemistry>Chapter 2 - Physical and Chemical Changes>EVALUATION>Q 1

When solute $\text{'}\mathrm{A}\text{'}$ dissolves in a solvent, the solution becomes hot and when solute $\text{'}\mathrm{B}\text{'}$ dissolves in the same solvent, the solution becomes cold. Classify the two changes as exothermic and endothermic. Give reasons to support your answer.