Exploring the candle experiment report

Exploring the name of the experiment: an exploration of the candle and its burning

Exploring the purpose of the experiment: Carefully observe the three stages of the candle before, during, and after the extinction, and learn to observe the process of change and its phenomena.

Laboratory supplies: a new candle, a match, a clean beaker, water, a sink, clarified lime water, a knife.

Experimental steps and methods:

1. Observe the color, shape, condition, and hardness of the candle; smell its smell.

Phenomenon: The candle is a white, soft, cylindrical solid, odorless, composed of white cotton and paraffin.

2. Cut a piece of paraffin with a knife and put it into the sink to observe its phenomenon in the water.

Phenomenon: Paraffin floats on the water and is insoluble in water.

Conclusion: Paraffin is a solid that is less dense than water and insoluble in water.

3. Light the candle and observe its change and its flame and its temperature comparison.

Phenomenon: Paraffin melts when heated, emits light when the candle burns, emits black smoke, and releases heat.

The candle flame is divided into three layers: outer flame, inner flame, and flame core. The outer flame has the highest temperature and the lowest flame heart.

Conclusion: Paraffin wax will melt when heated and form carbon black when burned.
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4. The dry beaker is placed over the candle flame. Observe the phenomenon on the wall of the beaker for a while, remove the beaker, and pour a small amount of lime water. Oscillate and observe the phenomenon.

Phenomenon: Many small drops of water appear on the wall of the dried beaker. After removing the beaker, quickly pour clarified lime water and shake it, and the lime water becomes cloudy.

Conclusion: When the candle burns, it produces two substances, water and carbon dioxide, which can make the lime water turbid.

5. Extinguish the candle, observe the phenomenon, use the match to ignite the white smoke just after the extinction, and observe what happens.

Phenomenon: The melted paraffin gradually solidifies, and the white cotton cord is blackened and fragile. When the match is used to ignite the white smoke that has just been extinguished, the candle will burn again.

Conclusion: Paraffin wax is solidified by cold, carbon black is produced during combustion, cotton is carbonized, white smoke is composed of fine paraffin particles, and it is flammable.

Experimental results:

Candles can burn in the air, producing many new substances during and after the combustion process.

Questions and suggestions:

Why can a candle burn? Under what conditions can a candle burn? Is the change in the new substance produced by the burning of such a substance a chemical change or a physical change?