Experiment 4 Quiz Sample Questions
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13 Terms
After the completion of the reaction sequence: Cu → Cu(NO3)2 → CuCO3 • Cu(OH)2 →CuO → CuSO4 → Cu, mass of the product is higher than the mass of starting material. Does it mean that Principle of Conservation of Mass is not valid?
No. All reactions are giving <100% yield (or result from impurities/incomplete drying)
CuSO4 + Mg → MgSO4 + Cu is a metathesis reaction
True
H2SO4 + Mg → MgSO4 + H2 is a redox (reduction-oxidation) reaction
True
Why the reaction Zn + HNO3 → Zn(NO3)2 + H2O + NO2 should be performed in a hood?
NO2 is a toxic gas
Heating of CuCO3 • Cu(OH)2 produces toxic gas
False (it produces CO2 and water vapor)
Filtrate is:
solution that passed filter
The purpose of washing the solid on filter is:
to remove impurities
Dissolving the solid copper oxide CuO on filter is an example of:
reaction
The purpose of adding Mg to copper sulfate solution is:
producing copper metal from salt
The purpose of adding sulfuric acid to the precipitate, copper + excess of magnesium, is:
dissolving magnesium
Reaction of magnesium and sulfuric acid H2SO4 produces flammable gas:
True
Reaction of CuO and sulfuric acid produces toxic gas
False
Reaction of copper nitrate Cu(NO3)2 and sodium carbonate Na2CO3 produces CO2
False
