PROBLEM: How is air polluted?

PREDICTION:

CAREFULLY DO THESE EXPERIMENTS: LISTEN TO YOUR INSTRUCTOR

EXPERIMENT 1.
MATERIALS: beaker or glass jar, candle, matches, tray, water

1. Place the candle in the middle of the tray.
2. Pour water to cover about 1 cm of the tray.
3. Light the candle and cover it with the jar.
4. Watch the water level as the flame goes out.

Describe what happens:

DO THE FOLLOWING EXPERIMENTS OVER THE TRAY WITH WATER.

EXPERIMENT II.
MATERIALS: candle, jar, foil, tray, water

1. Place a candle inside a horizontally held jar with aluminum foil below the candle.
2. Hold the candle horizontally in the jar.
3. Let it burn for 1 minute.
4. Cool the bottle, then see if you have residue in the bottle.

What did you find?

EXPERIMENT III.

With the same jar, put a few pieces of leaves on the bottom of the jar. After your instructor approves, place a match or candle to the leaves. What happens?

CONCLUSION: Does all burning create pollution?