1. People and animals use oxygen in respiration. As oxygen is inhaled, some
materials inside the body combine with it and undergoes
A. chemical reaction that gives off carbon dioxide, water and energy.
B. harmful substances to mixed with the air.
C. physical change to all the matter around it.
D. social changes to those living organism on the environment.
2. Matter could be changed chemically due to
A. Application of change
C. cold resistance
B. Application of heat
D. oxygen
3. What causes rust to form?
A. reaction of iron to heat
C. reaction of iron to oxygen
B. reaction of iron to force
D. reaction of iron to cold weather
4. What is formed when iron is combined with oxygen
A. rust
B. water
C. heat
D. carbon dioxide
5. When a material is exposed to heat and formed into another material, it
undergoes-
A. physical change
C. both A and B
B. chemical change
D. all of the above
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Answer:
1. d
2. a
3. c
4. a
5. d
Explanation:
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