Reaction Type & Balancing Review Questions

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1 Reaction Type & Balancing Review Questions There are 20 questions sets in this review. The corresponding answers can be found in the second half of this document. 1. Match the term with its proper description. 1. Product A. A reaction in which a single compound is broken into simpler substances 2. Chemical equation B. A small whole number that appears before a formula in a chemical equation 3. Decomposition reaction C. An equation that satisfies the Law of Conservation of Mass 4. Coefficient D. A concise representation of a chemical reaction 5. Balanced equation E. A new substance formed in a reaction 2. Identify the following reaction types. 1 CaCl 2 + HNO 3 Ca(NO 3 ) 2 + HCl 2 SO 2 + H 2 O H 2 SO 3 3 Pb(OH) 2 PbO + H 2 O 4 NH 3 + O 2 N 2 + H 2 O 5 CH 4 + O 2 CO 2 + H 2 O 6 SiO 2 + HF H 2 O + SiF 4 7 C 6 H 12 O 6 + O 2 CO 2 + H 2 O

2 3. Balance these equations. 1 NH 4 Cl + NaNO 2 NaCl + N 2 + H 2 O 2 Hg 2 O + O 2 HgO 3 Mg(HCO 3 ) 2 + HCl MgCl 2 + H 2 O + CO 2 4 ZnS + O 2 ZnO + SO 2 5 Al 2 (SO 4 ) 3 + NaHCO 3 Al(OH) 3 + Na 2 SO 4 + CO 2 6 As + O 2 As 2 O 3 7 BaBr 2 + Na 3 PO 4 Ba 3 (PO 4 ) 2 + NaBr 8 Al 2 O 3 + HF AlF 3 + H 2 O 4. Identify the following reaction types. Assume all reactions are possible. 1 2KNO 3 2KNO 2 + O 2 2 Hg + 2HNO 3 HgNO 3 + H 2 3 2Na + 2HNO 3 2NaNO 3 + H 2 4 (NH 3 )PO 4 + LiOH Li 2 PO 4 + 3NH 4 OH 5 2NaCl 2Na + Cl 2 6 BaO + H 2 O Ba(OH) 2 7 2NaClO 3 2NaCl + 3O 2 8 ZnCl 2 + H 2 S 2HCl + ZnS 9 SO 2 + H 2 O H 2 SO Al + 6HCl 2AlCl 3 + 3H 2 11 C 2 H 10 O 6 + O 2 CO 2 + H 2 O

3 5. Predict the products of the following reactions. Make sure the reaction is possible and make sure the charges are balanced in your formulas! 1 Ba + O 2 2 MgO 3 Zn + CuSO 4 4 Ag + FeSO 4 5 BaCl 2 + Na 3 PO 4 6 CuO + H 2 SO 4 7 C 4 H 10 + O 2 6. Predict the products of the following reactions. Make sure the reaction is possible and make sure the charges are balanced in your formulas! 1 Mg + N 2 2 C 3 H 8 + O 2 3 HNO 3 + LiOH 4 KC 2 H 3 O 2 + NH 4 OH 5 Mg + H 2 O 6 HgO 7 Ba + Br 2

4 7. Balance the following equations. The chemical formulas are correct. 1 NaClO 3 NaCl + O 2 2 Mg + H 3 PO 4 Mg 3 (PO 4 ) 2 + H 2 3 (NH 4 ) 2 CO 3 + NaOH Na 2 CO 3 + NH 3 + H 2 O 4 W + Cl 2 WCl 6 5 N 2 + H 2 NH 3 6 H 2 O + P 2 O 5 H 3 PO 4 8. The following equations are wrong. Fix them, then balance them. 1 Ca(SO 4 ) 2 + NaCO 3 NaSO 4 + CaCO 3 2 Cl + NaBr NaCl + Br 3 Al + Na(OH) 2 + H 2 O NaAl(OH) 4 + H 2 4 C 4 H 8 + 4O 2 4CO 2 + 4H 2 O 9. Something is wrong in each of the following equations. Find the problem, then write the properly balanced equation. 1 2KI + Pb(NO 3 ) 2 PbI + 2KNO 3 2 2Al + 3O Al 2 O 3 3 NH 3 + HSO 4 NH 4 SO 4 4 Al + Fe 2 O 3 AlO 3 + Fe 2

5 10. Match the term with its proper description. 1. Activity Series of Metals A. An ingredient in a reaction 2. Reactant B. Reversible reaction 3. Combustion reaction C. A reaction in which the products are carbon dioxide and water 4. Single-replacement reaction D. A reaction in which atoms of 1 element replace atoms of a second element 5. E. A list in order of decreasing reactivity 11. Predict whether or not the following reactions will occur. 1 HCl + Hg HgCl + H 2 2 H 2 O + Li LiOH + H 2 3 Cu(C 2 H 3 O 2 ) 2 + Pb(NO 3 ) 2 Pb(C 2 H 3 O 2 ) 2 + Cu(NO 3 ) 2 4 ZnBr 2 + K 2 CO 3 ZnCO 3 + KBr 5 Ca + LiOH Ca(OH) 2 + Li 6 NaOH + H 2 SO 4 H 2 O + Na 2 SO 4

6 12. Determine whether or not the following reactions can occur. If so, predict the products. 1 Pb(NO 3 ) 2 + KI 2 K 2 SO 4 + Zn 3 HgCl 2 + MgCrO 4 4 Cu 3 (PO 4 ) 2 + Fe 5 NaCl + KBr 6 AlF 3 + H Write balanced chemical equations to represent the following word equations. 1 Solid copper II carbonate decomposes when heated to produce solid copper II oxide and gaseous carbon dioxide. 2 Gaseous carbon tetrahydride, when heated with oxygen, produces gaseous carbon dioxide and liquid water. 3 Aqueous hydrogen peroxide decomposes in the presence of the catalyst manganese dioxide to produce liquid water and gaseous oxygen. 14. Predict the products of these reactions. 1 Zn + Ni(NO 3 ) 2 2 Fe + S 8 3 C 6 H 6 + O 2 4 HNO 3 + Sr(OH) 2 5 C 2 H 5 OH + O 2 6 Cl 2 + KI

7 15. Write balanced chemical equations to show the following word equations. 1 Ammonium nitrate + sodium hydroxide yields ammonia + water + sodium nitrate 2 Copper I sulfide and oxygen yield copper I oxide and sulfur dioxide 3 Barium and water yield barium hydroxide and hydrogen 16. Balance these equations. 1 Fe + O 2 Fe 2 O 3 2 H 2 O 2 H 2 O + O 2 3 CaCO 3 CaO + CO 2 4 AgNO 3 + Cu Cu(NO 3 ) 2 + Ag 5 NaCl + H 2 SO 4 Na 2 SO 4 + HCl 6 P + O 2 P 2 O 5 7 C 3 H 6 + O 2 CO 2 + H 2 O 8 CO + Fe 2 O 3 Fe + CO Using what you know about driving forces of doublereplacement reactions determine whether or not the following will take place (yes or no). 1 K 2 SO 4 + BaCl 2 BaSO 4 + 2KCl 2 2AlF 3 + 3H 2 SO 4 Al 2 (SO 4 ) 3 + 6HF (aq) 3 SiO 2 + 4HF 2H 2 O + SiF 4 4 AgNO 3 + NaBr NaNO 3 + AgBr 5 Hg(OH) 2 + H 3 PO 4 Hg 3 (PO 4 ) 2 + H 2 O 6 CaCl 2 + Mg(NO 3 ) 2 Ca(NO 3 ) 2 + MgCl 2 7 H 2 SO 4 + NaOH H 2 O + Na 2 SO 4

8 18. Identify these reaction types. 1 Al + HCl AlCl 3 + H 2 2 C 6 H 12 O 8 + O 2 CO 2 + H 2 O 3 Na + Cl 2 NaCl 4 H 2 O H 2 + O 2 5 Fe(OH) 3 + HNO 3 Fe(NO 3 ) 3 + H 2 O 19. Use the Activity Series of Metals to determine if the following reactions can occur (yes or no). 1 Ag + HCl 2 Mg + AgNO 3 3 Cu + HNO 3 4 Li + Mg(OH) 2 5 Ca + NiSO 4 6 Pb + CuSO 4 7 Which of the above reactions would be the most explosive?

9 20. Match the symbol with its proper meaning. 1. (aq) A. manganese dioxide as a catalyst 2. (l) B. liquid 3. (s) C. gaseous 4. D. precipitate 5. E. bubbles 6. F. aqueous MnO 2 7. (g) G. heat added 8. H. yields 9. I. solid

10 1. 1 E 2 D 3 A 4 B 5 C Answers 2. 1 double-replacement 2 synthesis 3 decomposition 4 single-replacement 5 combustion 6 double-replacement 7 combustion :1:1:1:2 2 2:1:4 3 1:2:1:2:2 4 2:3:2:2 5 1:6:2:3:6 6 4:3:2 7 3:2:1:6 8 1:6:2:3

11 4. 1 Decomposition 2 Single-replacement 3 Single-replacement 4 Double-replacement 5 Decomposition 6 Synthesis 7 Decomposition 8 Double-replacement 9 Synthesis 10 Single-replacement 11 combustion 5. 1 BaO 2 Mg + O 2 3 ZnSO 4 + Cu 4 Can t happen 5 Ba 3 (PO 4 ) 2 + NaCl 6 CuSO 4 + H 2 O 7 CO 2 + H 2 O 6. 1 Mg 3 N 2 2 CO 2 + H 2 O 3 H 2 O + LiNO 3 4 Nothing! 5 Mg(OH) 2 + H 2 6 Hg + O 2 7 BaBr 2

12 7. 1 2:2:3 2 3:2:1:3 3 1:2:1:2:2 4 1:3:1 5 1:3:2 6 3:1: CaSO 4 + Na 2 CO 3 CaCO 3 + Na 2 SO 4 2 Cl 2 + 2NaBr 2NaCl + Br 2 3 2Al + 2NaOH + 6H 2 O 2NaAl(OH) 4 + 3H 2 4 C 4 H 8 + 6O 2 4CO 2 + 4H 2 O KI + Pb(NO 3 ) 2 PbI 2 + 2KNO 3 2 4Al + 3O 2 2Al 2 O 3 3 2NH 3 + H 2 SO 4 (NH 4 ) 2 SO 4 4 2Al + Fe 2 O 3 Al 2 O 3 + 2Fe E 2 A 3 C 4 D 5 B

13 11. 1 No 2 Yes 3 No 4 Yes 5 No 6 Yes PbI 2 + KNO 3 2 Nothing 3 HgCrO 4 + MgCl 2 4 Fe 3 (PO 4 ) 2 + Cu 5 Nothing 6 Nothing CuCO 3 (s) CH 4 (g) + 2O 2 CuO (s) + CO 2 (g) CO 2 (g) + 2H 2 O (l) 3 2H 2 O 2 (aq) MnO 2 2H 2 O (l) + O 2 (g)

14 14. 1 Zn(NO 3 ) 2 + Ni 2 FeS 3 CO 2 + H 2 O 4 H 2 O + Sr(NO 3 ) 2 5 CO 2 + H 2 O 6 KCl + I NH 4 NO 3 + NaOH NH 3 + H 2 O + NaNO 3 2 2Cu 2 S + 3O 2 2Cu 2 O + 2SO 2 3 Ba + 2H 2 O Ba(OH) 2 + H :3:2 2 2:2:1 3 1:1:1 4 2:1:1:2 5 2:1:1:2 6 4:5:2 7 2:9:6:6 8 3:1:2:3

15 17. 1 Yes 2 No 3 Yes 4 Yes 5 Yes 6 No 7 Yes Single-replacement 2 Combustion 3 Synthesis (combination) 4 Decomposition (analysis) 5 Double-replacement No 2 Yes 3 No 4 Yes 5 Yes 6 Yes 7 #2

16 20. 1 F 2 B 3 I 4 D 5 G 6 A 7 C 8 E 9 H

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