CHEM 101 TEST QUESTIONS AND
ANSWERS ALL CORRECT
What evidence did you observe that oxygen is not very soluble in water? - Answer-O2
generated pushed water out of the bottle
what is the source of oxygen in the procedure you used? - Answer-hydrogen peroxide,
H2O2
what purpose does manganese dioxide serve in this preparation of oxygen? - Answer-
serves as a catalyst in the preparation of oxygen
what gas was in the apparatus before you started generating oxygen? where did it go? -
Answer-air- went into the first bottle
what is different about the composition of the first bottle of gas collected compared to
the other four? - Answer-contained more air bc before the oxygen started generating the
apparatus was filled with air
why are the bottles of oxygen stored with mouth up? - Answer-oxygen is heavier than
air causing it to sink- if the mouth was down the oxygen would escape
what is the symbol for oxygen element - Answer-O
what is the formula for oxygen gas - Answer-O2
which of the following formulas represent oxides - Answer-MgO, SO2, MnO2, PbO2,
Na2O2
write the word and formula equations for the preparation of oxygen from hydrogen
peroxide - Answer-hydrogen peroxide---> oxygen + water
2H2O (aq) ----> O2 (g) + 2H2O (l)
what substances, other than oxygen, are in the generator when the decomposition of
H2O2 is complete? - Answer-The other substances were the manganese dioxides and
water
combustion of wood. Assume carbon is the combustible material - Answer-carbon +
oxygen ---> carbon dioxide
combustion of sulfer... - Answer-sulfer + oxygen ---> sulfur dioxide
ANSWERS ALL CORRECT
What evidence did you observe that oxygen is not very soluble in water? - Answer-O2
generated pushed water out of the bottle
what is the source of oxygen in the procedure you used? - Answer-hydrogen peroxide,
H2O2
what purpose does manganese dioxide serve in this preparation of oxygen? - Answer-
serves as a catalyst in the preparation of oxygen
what gas was in the apparatus before you started generating oxygen? where did it go? -
Answer-air- went into the first bottle
what is different about the composition of the first bottle of gas collected compared to
the other four? - Answer-contained more air bc before the oxygen started generating the
apparatus was filled with air
why are the bottles of oxygen stored with mouth up? - Answer-oxygen is heavier than
air causing it to sink- if the mouth was down the oxygen would escape
what is the symbol for oxygen element - Answer-O
what is the formula for oxygen gas - Answer-O2
which of the following formulas represent oxides - Answer-MgO, SO2, MnO2, PbO2,
Na2O2
write the word and formula equations for the preparation of oxygen from hydrogen
peroxide - Answer-hydrogen peroxide---> oxygen + water
2H2O (aq) ----> O2 (g) + 2H2O (l)
what substances, other than oxygen, are in the generator when the decomposition of
H2O2 is complete? - Answer-The other substances were the manganese dioxides and
water
combustion of wood. Assume carbon is the combustible material - Answer-carbon +
oxygen ---> carbon dioxide
combustion of sulfer... - Answer-sulfer + oxygen ---> sulfur dioxide
