Analysis Sheet ● Objective 1 ○ To get the qualitative data listed below, we measured the candle before burning from top to bottom, both with and without the wick to get its height. We also weighed the candle to get its proper weight. Then, after burning, we took these same measurements again. ○ We observed that the candle, before burning for 30 seconds, was taller and heavier than it was after burning. ○ The fuel from the candle wax was burned off during combustion causing the candle to lose height and weight (see graph below). ● Objective 2 ○ To prove that oxygen from the air is required for the candle to burn we put the candle in a beaker and then lit it. After that we put a flask over the candle. ○ We observed that the flame went away after we put the flask over the candle. ○ The flame went out because the flask cut off the its oxygen supply, and oxygen is required for a combustion reaction to occur. ● Objective 3 ○ To prove candles produce CO2, which is the same gas that we exhale as we breath, as the burn we poured 40 mL of pre-boiled water into two plastic cups using a 50 mL beaker. Then we poured ten drops of phenol red indicator to each cup and stirred both cups with a straw. After that we had one person blow into one of the cups with the straw for 1 minute. ○ We observed that the water in the cup that was blown into turned red and then orange, while the cup that was not blown into stayed the same. ○ The reaction between CO2 and the phenol red solution caused the water in the cup that was blown into to turn orange. ● Objective 4 ○ To prove candles produce H2 O we first lit a candle. Then we created a sack out of aluminum foil to hold the ice in by folding a piece of foil into a square and then folding to corners in. We then filled the sack with ice and folded the corners together. After that we just held the sack over the candle flame. ○ After a while, we observed that there was condensation on the bottom of the sack, which indicated that H2 O had been formed from the combustion reaction. ○ A candle flame is a combustion reaction, and H2 O is a product of all combustion reactions. The aluminum foil sack filled with ice cooled down the water vapor that was being created by the combustion reaction, turning it into liquid water that we could see. ● Objective 7 ○ ● Objective 6 ○ To prove that you do not have to touch the wick of a candle with a flame to relight it after it had just been extinguished, we lit a candle, let it burn for one minute, and then extinguished it. Quickly after we extinguished the candle, we touched the smoke around the wick with a lighter flame. ○ We observed that the candle re-lit, without the lighter’s flame touching the wick. ○ The candle re-lit because the flame from the lighter traveled down the gas around the candle to the wick, relighting it.
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