Characteristics of a Chemical Change

Q.

Boiling of water involves which of the following change(s) ?

1. Chemical change

2. Physical change

3. Both physical and chemical change

4. Cannot be determined

Q. Cutting of a cloth is a physical change.

1. True
2. False

Q.

Change of state from ice to water and to steam has been shown below. What type of change is involved in the given picture?

Q. Dissolving salt in water is a physical or a chemical change?

Q. Which of the following changes is/are an example of a chemical change?

1. Fermentation in yeast
2. Dissolution of sugar in water
3. Shredding a sheet of paper into bits
4. Cooking of food

Q. Rotting of a banana can be identified by:

1. change in temperature
2. change in state
3. change in weight
4. change in colour

Q. Following are the cases of physical and chemical changes. Identify them. [2 MARKS]

Q.

A change of state from one form to other is a

1. Physical change

2. Chemical change

3. Biological change

4. Either a physical or chemical change

Q. Kerosene stove involves both physical and chemical changes. Explain.

Q.

Which of the following does not alter during a physical change?

1. Shape

2. Size

3. Composition

4. State

Q. Classify the following into physical and chemical change. [2 MARKS]

Q.

Reversible change refers to:

1. Change that can be undone

2. Change that cannot be undone

3. Change in which shape and size is changed

4. Change in which new substance is formed

Q. Classify the following changes as physical and chemical changes: digestion of food, making sugar syrup, burning of wood, cutting of fruits, boiling of egg, grinding wheat into flour, and stitching fabric into garments.

Q. On heating a salt solution, we can re-obtain the salt that was added.

1. False
2. True

Q.

Statement 1: Melting is a physical change as the melted wax can again be obtained as solid wax upon the removal of heat.
Statement 2: Burning of wax is a chemical change, as once the wax has been burnt, it cannot be obtained back in its original form.
Which of the following statement(s) is/are correct?

1. Statement 1 is correct

2. Statement 2 is correct

3. Both are incorrect

4. Depends on burning temperature

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. Identify the type of reaction in the given images:

1. 
2. 
3. 
4. 

Q. Molten is used for coating iron in galvanisation.

1. lead
2. zinc
3. copper
4. iron

Q. Which of the following changes is/are an example of a chemical change?

1. Fermentation in yeast
2. Dissolution of sugar in water
3. Shredding a sheet of paper into bits
4. Cooking of food

Q. Match column I with column II and select the correct option from the codes given below.

Column I	Column II
(P) Expansion of metals on heating	(i) Neither physical nor chemical change
(Q) A stone kept in the sunlight	(ii) Chemical change
(R) Burning of a candle	(iii) Combination of physical nor chemical changes
(S) Curdling of milk	(iv) Physical change

1. (P) - (iv), (Q) - (iii), (R) - (ii), (S) - (i)
2. (P) - (iv), (Q) - (i), (R) - (iii), (S) - (ii)
3. (P) - (i), (Q) - (ii), (R) - (iii), (S) - (iv)
4. (P) - (i), (Q) - (iv), (R) - (ii), (S) - (iii)

Q. Rusting of iron can be identified by change in it's:

1. shape
2. volume
3. state
4. colour

Q. Baking of bread, biscuits and muffins is a reversible change.

1. False
2. True

Q.

Q. Statement 1: Rusting of iron can be prevented by forming a layer of a substance on it.
Statement 2: The layer prevents the metal from interacting with the atmosphere.

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

Q. Rotting of a banana can be identified by:

1. change in temperature
2. change in weight
3. change in colour
4. change in state