Question

1. What are the ways to bring about changes in a substance? 2. Why the melting of ice is a reversible change? 3. changes occur in a match stick used for lightening? What type of change is it? 4. We dissolve salt in water. How can we reverse this change? 5. How the iron blade is fixed into a wooden handle in tools used to dig the soil? 6. How is metal rim fixed on a wooden wheel of a cart? How are the changes made in that metal?

Answer 1

Answer:

1)The substance can be changed by several ways like by altering its temperature.

2) The melting of ice is a reversible change because it doesn't need much alteration in the temperature.

3)chemical change

4)By adding a catalist to it.