Question

B. Fill in the blanks.
1 controls the rate of burning.
2 gas is necessary for respiration.
3. Carbonic acid gas is used to make carbonated drinks and soda water.
is used in weather balloons.
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Answer 1

Answer:

1. oxygen

2. oxygen

3 co2

4. helium

Explanation:

1. oxygen is helpful in burning.

2. oxygen is taken in by the animals and release co2 and the plants use co2 for formation of their food.

3. carbonic acid gas are used to carbonated drinks that is why we see so many bubbles in the drinks

4. helium is used in balloons as it is the lightest gas that makes the balloons float.