1. Multiple Choice. Read each sentence carefully and write the best answ.
1. Which of the following will produce rust when it is wete
A. a nail
B. a glass
C. a rubber band
D. a plastic spoon A
2. What causes the rusting of iron nails or iron-made materials in a wet clo
A presence of heat
C. presence of oxygen
B. absence of heat
D. absence of oxygen
3. Which of the following results in a physical change in an objecte
A. cutting wood into small pieces
C. burning a piece of paper
B. mixing paint with thinner
D. chewing a piece of bread
4. Physical change happens when materials undergo a change in
A. size
B. shape
C. phase
D. all of them
5. The candles melted by the application of heat. What took place when solid candles became liquid?
A. chemical change
C. no change
B. mechanical change
D. physical change
6. What happens when a chemical change occurs?
A. A new substance is formed.
C. A change in size is shown.
B. The same molecule stays.
D. There is no change in the materials. 7. When oxygen and moisture in the air combine with any metallic substance, what new substance is formed?
A. dust
B. rust
C. red glow
D. impurities
8. What is one bad effect of chemical change on food?
A. The food might be spoiled.
C. The food might get less.
B. The food might not be cooked.
D. The food might get softer.
9. Water is the primary source of rust because water contains?
A. oxygen
B. chloride
C. carbon
D. hydrogen
10. Which of the following procedures in cooking banana cue involves chemical change?
A. peeling the bananas
C. putting the bananas on the sticks
B. melting the sugar
D. selling the banana cue ​