Chemistry Predicting Products Quiz
Questions: 16 · 10 minutes
1. When magnesium ribbon burns in excess oxygen, which balanced equation shows the expected main product?
4Mg + O2 → 2Mg2O
Mg + O2 → MgO2
2Mg + O2 → 2MgO
No reaction occurs because magnesium has a protective oxide layer.
2. Hydrochloric acid and sodium hydroxide react in equal stoichiometric amounts. What products form?
H2 and NaClO
Na, Cl2, and H2O
NaCl and H2O
NaCl only
3. Aqueous silver nitrate is combined with aqueous sodium chloride. Which products are expected?
No reaction occurs because both reactants are soluble.
Ag, NaNO3, and Cl2 form.
AgNO2 and NaClO form.
AgCl and NaNO3 form.
4. Under suitable synthesis conditions, nitrogen reacts with hydrogen. Which balanced equation shows the expected product?
N2 + 3H2 → 2NH3
N2 + 2H2 → 2NH2
N2 + 2H2 → N2H4
N2 and H2 cannot form a compound.
5. Aqueous lead(II) nitrate is mixed with aqueous potassium iodide. Which balanced equation predicts the precipitate and remaining aqueous product?
Pb(NO3)2 + KI → PbI + KNO3
No reaction occurs because all ionic compounds remain dissolved.
Pb(NO3)2 + 2KI → PbK2 + 2INO3
Pb(NO3)2 + 2KI → PbI2 + 2KNO3
6. Aluminum reacts with oxygen to form its usual oxide. Which balanced equation correctly predicts the product?
4Al + O2 → 2Al2O
2Al + O2 → 2AlO
Al + O2 → AlO2
4Al + 3O2 → 2Al2O3
7. Excess hydrochloric acid is added to aqueous sodium carbonate, and the reaction continues until bubbling stops. What is the final balanced equation?
Na2CO3 + 2HCl → 2NaCl + H2CO3
Na2CO3 + HCl → NaHCO3 + NaCl
Na2CO3 + 2HCl → 2NaCl + H2O + CO2
Na2CO3 + 2HCl → NaCl + H2O + CO2
8. Solid ammonium chloride is warmed with sodium hydroxide. Which products are expected?
NaCl, NH3, and H2O
No reaction occurs because the ions simply remain mixed.
NaCl and NH3 only
NaCl and NH4OH only
9. Chlorine gas is bubbled through aqueous potassium bromide. Which balanced equation predicts the products?
Cl2 + 2KBr → 2KCl + 2Br
Cl2 + 2KBr → 2KBr + Cl2
Cl2 + 2KBr → 2K + 2BrCl
Cl2 + 2KBr → 2KCl + Br2
10. A clean copper wire is placed in aqueous magnesium chloride. Using the metal activity series, what should be predicted?
CuCl2 and Mg form.
No reaction occurs.
CuCl and Mg form.
CuMg and Cl2 form.
11. Hydrogen peroxide decomposes in the presence of a catalyst. Which balanced equation shows the expected products?
2H2O2 → 2H2 + 2O2
2H2O2 → 2H2O + O2
H2O2 → H2O + O
3H2O2 → 3H2O + O3
12. Ethanol, C2H5OH, burns completely in excess oxygen. Which balanced equation is correct?
C2H5OH + 2O2 → 2CO + 3H2O
C2H5OH + O2 → 2C + 3H2O
C2H5OH + 3O2 → 2CO2 + 3H2O
C2H5OH + 2O2 → 2CO2 + 3H2O
13. Aqueous sodium sulfate is mixed with aqueous barium chloride. Which equation shows the expected products?
Na2SO4 + BaCl2 → BaSO3 + 2NaClO
Na2SO4 + BaCl2 → BaSO4 + 2NaCl
Na2SO4 + BaCl2 → BaCl + Na2SO4Cl
Na2SO4 + BaCl2 → Ba + 2NaCl + SO2 + O2
14. A zinc strip is placed in aqueous copper(II) sulfate. Which equation represents the expected reaction?
Cu + ZnSO4 → CuSO4 + Zn
Zn + CuSO4 → ZnSO4 + Cu
Zn + CuSO4 → ZnCu + SO4
Zn + CuSO4 → ZnO + CuO + SO2
15. A sample of calcium carbonate is strongly heated. Which products are expected from its thermal decomposition?
CaO and CO2
CaO2 and CO
CaCO and O2
Ca and CO3
16. Methane undergoes complete combustion in excess oxygen. Which balanced equation predicts the products?
CH4 + 2O2 → CO2 + 2H2O
CH4 + O2 → C + 2H2O
2CH4 + O2 → 2CH3OH
2CH4 + 3O2 → 2CO + 4H2O