Choose the letter of the correct answer.
1.It happens when the materials change in shape or size but the substances or particles
making up the materials are still the same.
B. Chemical Change
A. Physical change
-2. It happens when the materials change to a new form or different substance.
A. Physical change B. Chemical Change
3. Cutting the apple into two pieces A. Physical change
B. Chemical Change
4. Apple tum into brownish in color after how many minutes
A. Physical change B. Chemical Change
5. Candle and Crayon melts A. Physical change
B. Chemical Change
6. Melted ice cubes A. Physical change B. Chemical Change
7. Rusting iron nails A. Physical change B. Chemical Change
8. burned leaves A. Physical change B. Chemical Change
9. When does rusting occur?
A. when the surface of the metals or its alloys, such as steel was still the same
B. when the surface of the metals or its alloys, such as steel will corrode in the presence of water.
C. when the surface of the metals or its alloys, such as steel will explode.
D. when the surface of the metals or its alloys, such as steel will become black
10. What is the role of putting vitamin C in the apple experiment?
A. Vitamin C acted as antioxidant that prevents the apple to turn brown in color
B. Vitamin C reacts on the water
C. There is no change happened D. The apple is still apple.
11.Heat causes the materials to change in their properties also. It will change state from solid
to liquid which is called
A. Melting B. Cooling C. Freezing D. Evaporating
12. Heat was absorbed by the lighted candle and crayon, they changed state from liquid to
solid. What do you call this process? A. Melting B. Cooling C. Freezing D. Evaporating
13. Water is the primary cause of rust because water contains
A. oxygen B. carbon C. chloride D. hydrogen
14. When physical change in materials happened, there is
A. formation of new product or material C. formation of new shape and new color
B. no formation of new product or material D. Both B and C
15. What caused spoiled or rotten food?
A. Presence of heat and oxygen C. Presence of water
B. Absence of heat and oxygen D. Absence of water
16. Which of the following will produce rust when it is wet?
A. ball B. comb C. nail D. paper plate
17. Which of the following is NOT an example of physical change?
A. burning of leaves B. Cracking of grounds C. Cutting of trees D. Pounding of rocks
18. Which of the following examples show a chemical change?
A. molding of a clay B. resting of paper clip C. Sharpening of pencil D. Bending of paper clip
19. Which is an example of physical change?
A. baking a cake B. a glass broken into pieces C. rotten fruits D. explosion of fireworks
20. Which of the following should be done in disposing rotten vegetables and fruit peelings?
A. burn them B. put them in a compost pit
C. throw them anywhere D. collect and sell them to the junk shop

PA ANSWER PO NEED KONS NGYON
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