Question

multiple choice
write the letter of the correct answer on the line at the left.

1. which of the following is not a physical change?

a crushing a can
b fireworks exploding
d sugar dissolving

1. which of the following is not a chemical change?

a iron rusting
c baking a cake
d mixing sand with water

1. a popsicle melts in your hand. which of the following is true about the change?

b it is a physical change that absorbs energy.
c it is a physical change where energy is neither absorbed nor released.
d. it is a chemical change & absorbs energy

Explanation:

• Question 24: A physical change is a change in which no new substances are formed. Crushing a can (A) and sugar dissolving (D) are physical changes. Fireworks exploding (B) is a chemical change as new substances are formed.
• Question 25: A chemical change is a change in which new substances are formed. Iron rusting (A), baking a cake (C) are chemical changes. Mixing sand with water (D) is a physical change as no new substances are formed.
• Question 26: Melting of a popsicle is a physical change (no new substance formed). Melting is an endothermic process (absorbs energy).

Answer:

1. B
2. D
3. B