Question

A. Choose the correct answer.
1. Melting gold to make new earrings is
a. physical change
c. undesirable change
b. chemical change
d. irreversible change
2. When tomato soup is prepared
a. no new substance is formed
b. a new substance is formed
c. the change can be reversed
d. it is a physical change
3. When mozzarella cheese melts, it is
a. a reversible change
b. an irreversible change
c. a physical change
d. a chemical change
4. A physical change is
a. always reversible
b. usually reversible
c. always irreversible
d. always desirable
5. Process due to which steam is converted into water is called
a. evaporation
b. condensation
c. boiling
d. sublimation
When a candle is lighted, following observations are made:
i. the candle burns
ii. size of the candle reduces
iii. wax melts
iv. melted wax solidifies
Which of the above changes are reversible?
a. ii. and iii.
b. iii. and iv.
c. i. and iv.
d. ii. and iv.
B. Fill in the blanks.
1. Freezing of water is an example of___________
change
2. If you could capture all the steam that is made when water in a kettle boils, you could turn it back to water by________
3. During a ____________
change, new substances are formed.
4. Changing a straight piece of wire into a spring is a_______
change because you can convert the spring into straight piece of wire again​

Answer 1

Answer:

A)1)(a)

2)(b)

3)(a)

4)(b)

5)(b)

B)1) Reversible

2) Condensation

3) Chemical

4) Reversible.

Answer 2

Answer:

A)1)(a)

2)(b)

3)(a)

4)(b)

5)(b)

B)1) Reversible

2) Condensation

3) Chemical

4) Reversible.