Ela Chowdary Solutions for Chapter: Physical and Chemical Changes, Exercise 4: EVALUATION

Give one word for the following:
Change of a substance from one physical form to another.

Name four processes which are involved in the change of state of a substance.

Why is burning of a fuel a chemical change?

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

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

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

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

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.