Change of Phase

Q.

Give an example of physical as well as chemical change.

Q. Define physical and chemical change and give two suitable examples for each.

Q. A substance which can not sublime is

1. sugar
2. dry ice
3. camphor
4. iodine

Q.

B. Statements given below are incorrect. Write the correct statements:

5. Formation of frost during winter is an example of a chemical change.

Q.

Classify the following as physical or chemical change.

Grinding corn into corn flour

Q.

3. Classify the following as physical change or chemical change:

(f) Moulding of glass

Q.

State one instance where water undergoes physical change and one in which it undergoes chemical change

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

Q.

Ammonium chloride sublimates on…………………

Q.

Give two difference between physical and chemical changes.

Q.

Following figure shows ____ change.

1. Irreversible

2. Both reversible and irreversible

3. No change is happening.

4. Reversible

Q.

Which of the following is not a sublimate?

1. Iodine

2. Camphor

3. Napthalene

4. Iron

Q.

Define melting point.

Q.

The process by which a solid changes into a liquid is called?

1. Condensation

2. Melting

3. Boiling

4. Freezing

Q. Define physical and chemical change and give two suitable examples for each.

Q. Which among the following is an example of physical change?

1. Melting ice
2. Burning wood
3. Rusting iron
4. Frying egg

Q.

The temperature at which a solid gets converted to a liquid is called the_____.

1. Melting point

2. Boiling point

3. Fusion point

4. Fission point

Q.

On lowering the temperature, a liquid turns into a solid. What is this process called?

1. Freezing

2. Condensation

3. Melting

4. Sublimation

Q. Which among the following substance undergoes sublimation?

1. Naphthalene
2. Iron
3. Common salt
4. Sugar

Q.

When potassium permanganate is heated it produces potassium manganate, manganese dioxide and oxygen gas. This is an example of ______ reaction.

1. exothermic

2. electrolytic

3. endothermic

4. electrochemical

Q.

What is the melting point of ice?

Q. Drying of a shirt in the sun is an example of __________ change.