Physical Changes

Q. What happens when lemon juice is mixed with baking powder ?Is it a physical or chemical change? justify your answer.

Q.

Difference between heating and burning and melting of wax

Q.

Melting of wax is an example of _____ Change. (physical/chemical)

Q. What is physical and chemical change?

Q.

The melting of wax or the burning of wax in a candle can both be classified as physical changes

1. True
2. False

Q.

How does a solid get dissolved in liquid?

Q.

Which of the following is not a physical change?

1. Respiration

2. Burning of coal

3. Melting of wax

4. Digestion of food

Q.

After studying, Shreya decided to make coffee. While making coffee, she thought about the kind of change involved. What is it according to you?

1. Physical change.

2. Chemical change.

3. Both physical and chemical change.

4. Cannot be determined.

Q.

Burning of a candle is:

1. a physical change

2. a chemical change

3. a physical and a chemical change

4. biological change

Q.

We observe that some portion of wax (in candle) melts and other portion of it is used in producing heat and light.
Statement A: The melting of wax is a physical change
Statement B: The burning of wax for the production of heat and light is a chemical change.
State which of the statement(s) is/are true.

1. Both Statement A and Statement B are true

2. Both Statement A and Statement B are false

3. Only Statement B is true

4. Only Statement A is true

Q.

If we burn a candle what changes is occur around us?

Q. Three substances given below are kept in the open for a few days and some changes were observed.

Which of the substances will show a chemical change?

1. Eggs
2. Plastic bottle
3. Both eggs & moth balls
4. All eggs, plastic bottle and moth balls

Q. Digestion of food is a physical change.

1. True
2. False

Q.

Change of water into steam is a:

1. physical change

2. physical and chemical change

3. biological change

4. chemical change

Q. Burning of wood and rusting of iron bar are examples of ___________ changes.

1. chemical

2. physical

3. physical and chemical

4. biological

Q. Which of the following is a physical change?

1. Burning fuel in your car
2. Respiration (inhaling oxygen gas and exhaling carbon dioxide gas)
3. Baking cookies
4. Mixing vinegar and baking soda
5. Evaporating water

Q.

Burning of a candle is:

1. a physical change

2. a chemical change

3. a physical and a chemical change

4. biological change

Q.

We observe that some portion of wax (in candle) melts and other portion of it is used in producing heat and light.
Statement A: The melting of wax is a physical change
Statement B: The burning of wax for the production of heat and light is a chemical change.
State which of the statement(s) is/are true.

1. Both Statement A and Statement B are true

2. Both Statement A and Statement B are false

3. Only Statement A is true
4. Only Statement B is true

Q. Formation of manure from leaves is a:

1. physical change
2. chemical change
3. periodic change
4. reversible change

Q.

Which of the following changes indicate that a chemical change has not been taken place?

1. No new substance is formed
2. Absorption or release of heat
3. Change in colour
4. Evolution of gas

Q. The interconversion of a substance from one state of matter to another is an example of ___ change (physical/chemical).

Q.

Burning of a candle is:

1. biological change

2. a physical change

3. a chemical change

4. a physical and a chemical change