1. The problem statement, all variables and given/known data In class we did a lab with burning candles and water. In this way 1. Find a large beaker that can contain certain amount of water, graduated cylinders, and a candle. 2. After measuring each equipments, try to make the candle stand straight in the water filled beaker. 3. Light the candle and put the graduated cylinder on top of the candle. * The top of the beaker must be under water so oxygen cannot come in. 4. After the light goes out, record your observation. Basically what it does is the the candle burns oxygen enabling water to rise. So it is said that the Earth's air is made up of 20% oxygen. Question 1: will this experiment prove this theory? Question 2: what is going on inside the graduated cylinder? 3. The attempt at a solution 22.1519% 25.6929% 19.6203% After 3 trials these percentage are the experimental values. 22,26,20. SO i think the answer to Q1 is false because the numbers were different. but i can't back it up with valid evidence Q2. I think it has to do with the pressure and volume. Since oxygen is burned up the water will rise to fill the empty space, but what about CO2? won't it fill the empty space of O2?