Pre-Test: What I Know
Dari Choose the letter of the correct answer. Write your answer in your notebook
2. Three things are needed for fire to occur: heat fuel and
B gasoline
A iron
C. oxygen D. water
2 This is a chemical reaction that occurs when oxygen reacts with a flammable substance to create heat
and light
A combustion
C. electrolysis
B. decomposition
D. rusting
3. Ohygen and iron combines and forms a compound called
B. fire
A electrolyte
C. paint
D. rust
4. When an apple is cut, the fleshy part of the fruit changes in:
B. odor
A color
C. shape
D. taste
s. To prevent metal from rusting you can use
A oil
B. paint
C. water
D. wax
& Which of the following fruits vegetables tum brown when cut and exposed to oxygen
B. garlic C. squash
D. water melon
A banana
7. Which of the following shows physical change?
A. burning paper B. baking cake
C. cutting cloth
D. fermenting wine
& Which of the following shows physical change?
A. burning garbage B. decaying vegetable
C. rotting tomato
D. melting wax
7. Which of the following shows chemical change?
A. burning paper B. chopping wood
C. cutting cloth
D. sewing sock
10. Which of the following shows chemical change?
A. boiled water
B. rusty roof
C. sliced bread
D. wet cloth
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