18.Which of the following results in a physical change of a substance?
A.Burning of wood
B.tearing of paper
C.mixing of iron and metal
D.Formation of new product
19. Which is NOT true about chemical change?
A. New materials are produced
B. The change involves heat or light
C. New properties of the matter are observed
D. The composition of the matter is unchanged
20. Which of the following occurs under the lack of oxygen?
A. Rising of iron
B. Burning of gasoline
C. Oxidation in apples
D. Fermentation of wine
21. What will happen to sliced pieces of apple when exposed to oxygen
A.It will taste salty
B. It will taste salty
C.It will become ripe
D.It will turn into brown
22. What evidence can you find when metals are exposed to oxygen?
A. precipitate
B. molds
C. bubbles
D.rust
pls answer it
Thx
Answers
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1. A.Burning of wood
2. D. The composition of the matter is unchanged
3. D. Fermentation of wine
4. D.It will turn into brown
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