Question

1. Which of the following is an example of physical change? *

Lighting a piece of paper on fire and the paper burns up and leaves ashes.
Mixing baking soda and vinegar together, and this causes bubbles.
Baking a birthday cake for your mother.
A glass cup falls from the counter and shatters on the ground.

Answer 1

a glass cup falls  from the counter and shatters in my opinion i think as after the cup breaks it can be fitted again.

Answer 2

The following is an example of physical change - A glass cup falls from the counter and shatters on the ground.

Two Types of Changes are listed below:

1. Physical change
2. Chemical change

What is Physical Change?

• A physical change is a change in which no new substance is obtained, only the physical state of the substance is changed.
• When a glass cup falls from the counter and shatters on the ground, it will still remain glass only.
• As the composition of the substance remains the same, it is an example of physical change.

What is Chemical Change?

• A chemical change is a change in which a new substance is formed after a chemical reaction takes place.
• When a paper is lighted, it burns and ashes are left behind. This is a chemical change as the chemical reaction takes place and a new substance is obtained. (Chemical properties of ash and paper are different.)
• When baking soda is mixed with vinegar, a chemical reaction takes place which causes bubbles. Thus, it is a chemical change.
• While baking a cake, the raw materials are mixed and then placed in an oven. When heat is supplied, the materials will lose their initial characteristics and hence it is also an example of chemical change.

Some Indicators of Chemical Change:

1. Production or absorption of heat or light
2. Production fo sound
3. Production of bubbles
4. Release of odour or change in existing odour
5. Change in colour
6. Liberation of a gas