Question

(vi) Which is a way to make a change happen?
(a) Heating a substance
(b) Cooling a substance
(c) Mixing a substance with another substance
(d) All of these

Answer 1

Answer:

( d ). is the right answer

Answer 2

Answer:

The correct option is (A) All of these.

Explanation:

To see any physical changes in a substance, we have to change its appearance.

• To change a state we either have to provide heat or remove heat. For example- liquid can be changed to solid by removing heat and lowering the temperature. Solid can be changed to liquid by providing heat and increasing the temperature.
• We can also cut or stretch out the substance to change its size.

To see any chemical changes in a substance, we have to change its chemical properties.

• We provide or remove heat and add other substances. While cooking an egg in oil, the color, texture, and smell change.