1) Write the equation for the reaction used to generate oxygen gas.
Word Equation: Not provided
Balanced Chemical equation: Not provided
2) What is the name of the catalyst used in this reaction?
What is the purpose of this catalyst? (There are two parts to this answer.)
3) In addition to oxygen, what other substance is produced by this reaction? What happens to this substance?
4) Two notable physical properties of oxygen are its low solubility in water and a density greater than air.
4a: Which one of these properties allows the oxygen gas to be collected via the displacement of water? Explain.
4b: Which one of these properties allows the oxygen gas collected to be stored in the bottle's mouth up? Explain.
5) What percentage of the air we breathe is oxygen gas?
1) Why did you perform each test in two separate bottles (air-filled and oxygen-filled)?
2) Are the combustion reactions of oxygen exothermic or endothermic? Support your answer with experimental evidence from the tests you performed.
3) Consider your results for the first four tests you performed. In which bottles, air-filled or oxygen-filled, did the combustion reactions occur more vigorously? Why?
4) Consider your Test 2 results. Although the candle burns for a longer period of time in one bottle, it eventually goes out in both the empty bottle and Bottle #2. Why does it go out?