Name:                                                                                                  Chem 9, Section:                                 

 

Lab Partner:                                                                                          Experiment Date:                                 

 

The Properties of Oxygen Gas

 

Part A: Generating and Collecting Oxygen Gas

 

1)   Write the equation for the reaction used to generate oxygen gas.

 

Word Equation:                                                                                                                                          

 

Formula Equation:                                                                                                                                       

 

2)   What is the name and formula of the catalyst used in this reaction?

 

 Name                                                                      Formula                                                        

              

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.

 

a.       Which one of these properties allows the oxygen gas collected to be stored in the bottles mouth up?  Explain.

 

 

 

 

 

 

 

b.       Which one of these properties allows the oxygen gas to be collected via the displacement of water?  Explain.

 

 

 

 

 

 

 

 

Part B: The Properties of Oxygen Gas

 

Test 1

Observations

Glowing splint in empty bottle

 

Glowing splint in Bottle #1

 

Test 2

Observations

Burning candle in empty bottle

 

Burning candle in Bottle #2

 

Test 3

Observations

Burning sulfur in empty bottle

 

Burning sulfur in Bottle #3

 

Test 4

Observations

Glowing steel in empty bottle

 

Glowing steel in Bottle #4

 

Test 5

Observations

Burning hydrogen in air

 

Test 6

Observations

Burning magnesium in air

 

 

Analysis of Combustion Results

 

1)   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?

 

 

 

 

 

 

 

 

2)   Are the combustion reactions of oxygen exothermic or endothermic?  Support your answer with experimental evidence from the tests you performed.

 

 

 

 

3)   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?

 

 

 

 

 

 

 

 

4)   When an element burns in oxygen gas, the product is called an oxide. 

 

a.   The wood in the splint consists mostly of carbon.  The combustion of carbon produces carbon dioxide, CO2.  Write the equation for the combustion of wood (carbon).

 

Word Equation:                                                                                                                                          

 

 

b.   The combustion of sulfur produces sulfur dioxide, SO2.  Write the equation for the combustion of sulfur.

 

Word Equation:                                                                                                                                          

 

 

c.   Steel wool consists mostly of iron.  The combustion of iron produces iron(III) oxide, Fe2O3.  Write the equation for the combustion of steel wool (iron).

 

Word Equation:                                                                                                                                          

 

 

d.   The combustion of hydrogen produces water, H2O.  Write the equation for the combustion of hydrogen.

 

Word Equation:                                                                                                                                          

 

 

 

 

 

 

 

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