Differences between Physical and Chemical changes

Q.

Is cooking an egg a chemical change?

1. True
2. False

Q.

So, rusting of iron is a chemical change or physical change???

Q.

How would you show that setting of curd is a chemical change?

Q.

Burning of candle is an example of ______________.

1. physical change

2. None of the given options

3. chemical change

4. both physical & chemical change

Q.

Explain with an experiment that the melting of wax is a physical change.Observe the changes around you and make a list of these changes and categories them into physical and chemical change.(At least 10 for each)

With the help of a suitable diagram explain the change of state of matter , with respect to

1. Kinetic energy

2. Intermolecular force of attraction

3. Intermolecular space

Q.

Classify the following as physical or chemical change.

cooking idli from a batter

Q.

Name the following?

A man-made physical change?

Q.

A chemical change can be reversed easily.

1. True
2. False

Q.

Which one of the following processes involves chemical reaction?

1. Storing of oxygen gas under pressure in a gas cylinder

2. Liquification of air

3. Keep petrol in a china dish in the open

4. Heating copper wire in presence of air at high temperature

Q.

If rusting of iron is a chemical change than how it converts back to its original form (iron). As I have seen that if we pore cold drinks on rusting iron and keep it for sometimes. And then if we wash the iron with water than it will convert back to its original form. I have seen with my own eyes......

Q.

Which of the following are examples of chemical reactions?

i. Burning of wood

ii. Cutting of wood

iii. Conversion of steam to water

iv. Rusting of almirah

1. i, iv

2. i, iii, v

3. ii, iv, v

4. v, ii, iii

Q.

Burning of a paper is not a chemical change.

1. True
2. False

Q.

5. Ripening of fruits is ___________ change.

Q.

Changes in which one or more new substances are formed is called ____________ change.

Q.

Why is the rusting of iron termed as a chemical change?

1. It is a temporary change.

2. It can be cleaned and the original substance can be recovered.

3. A new substance is formed.

4. It is a slow reaction.

Q.

By giving a reason state why chemical change takes place in the following case:

Bursting of crackers

Q.

Which changes are called permanent changes?

Q.

Classify the following as a physical or chemical change. State a reason for the choice.

Dissolving salt in water.

Q.

Which of the following are examples of chemical reactions?

i. Burning of wood

ii. Cutting of wood

iii. Conversion of steam to water

iv. Rusting of almirah

v. Dissolving common salt in water

1. v, ii, iii

2. i, iv

3. i, iii, v

4. ii, iv, v

Q. Statement 1: No New substance is formed during a physical change.

Statement 2: New substances are formed during chemical changes.

1. Both statements are true.
2. Only statement 2 is true.
3. Both statements are false.
4. Only statement 1 is true.

Q. Is rusting physical change?

Q.

Which of the following can be categorised as both chemical and physical change?

1. Formation of curd from milk.

2. Rusting of iron

3. There is no such case possible in general.

4. Both rusting of iron and formation of curd from milk.

Q. Harry went to a bakery and found out that the bread is made from wheat. What type of changes is involved in making of bread?

1. Permanent
2. Natural
3. Temporary
4. Man-made

Q.

Select the ascending order based on the time taken for the given changes to occur: ​

1. Glowing of bulb, 2. Germination of a seed, 3. Boiling of water, 4. Bursting of crackers

1. 1, 2, 3, 4
2. 1, 4, 3, 2
3. 4, 1, 3, 2
4. 1, 3, 2, 4

Q. Rusting of iron is a physical change.

1. True
2. False

Q. Which of the following is true for a chemical change?
(I) New substance is formed.
(II) The change is reversible
(III) The change is permanent

1. Only (I) and (III)
2. Only (I)
3. Only (I) and (II)
4. (I), (II) and (III)

Q. Which one of the following is not a physical property?

1. Smell
2. Shape
3. Size
4. Flammability

Q. Statement I: The melting of wax is a physical change.
Statement II: The burning of wick for the production of heat and light is a chemical change.

1. Both statements are true
2. Both statements are false
3. Only statement II is true
4. Only statement I is true

Q.

Classify the following as physical and chemical changes:
(i) Cleaning with soap and water
(ii) Cooking chicken
(iii) Formation of clouds
(iv) Making ice candy

1. Physical change - (i), (ii), (iii); chemical change - (iv)

2. Physical change - (i), (iii), (iv); chemical change - (ii)

3. Physical change - (i), (ii); chemical change - (iii), (iv)

4. Physical change - (i), (iii); chemical change - (ii), (iv)

Q. Harry went to a bakery and found out that the bread is made from wheat. What type of changes is involved in making of bread?

1. Permanent
2. Temporary
3. Natural
4. Man-made