Properties and Changes in Matter and Chemical Reactions Test Review Key
4. 2, 16
5. 16
6. 12
7. combustion, C2H5OH + 3O2 → 2CO2(g) + 3H2O(g)
8. synthesis, Na2O(s) + H2O → 2NaOH
9. double replacement, PbCl4(aq) + 2Na2CrO4(aq) → Pb(CrO4)2(s) + 4NaCl(aq)
10. synthesis, H2(g) + F2(g) → 2HF (g)
11. double replacement, Al2(SO4)3(aq) + 3Ca(OH)2(aq) → 2Al(OH)3(s) + 3CaSO4(s)
12. decomposition, Mg(ClO3)2(s) → MgCl2 + 3O2
13. decomposition, Fe2(CO3)3 → Fe2O3 + 3CO2
14. decomposition, 2KOH → K2O + H2O
15. no reaction, lithium is a light metal
16. decomposition, 2RaO → 2Ra + O2
17. combustion, 2C8H18(l) + 25O2(g) → 16CO2 + 18H2O
18. single replacement, Cl2(g) + 2NaBr(aq) → Br2 + 2NaCl
19. single replacemtn, Ba(s) + 2AgC2H3O2(aq) →2Ag + Ba(C2H3O2)2
20. synthesis, 2Cu(s) + O2(g) → 2CuO
21. synthesis, 4Fe(s) + 3O2(g) → 2Fe2O3
22. double replacement, 2Al(C2H3O2)3(aq) + 3Sr(OH)2(aq) → 3Sr(C2H3O2)2(aq) + 2Al(OH)3(s)
23, 24, 25, 26, 27 no reaction
28. (NH4)2S(aq) + Cd(NO3)2(aq) → CdS(s) + 2NH4NO3(aq) Net Ionic: Cd+2 + S-2 → CdS
29. Zn(NO3)2(aq) + CaS(aq) → ZnS(s) + Ca(NO3)2(aq) Net Ionic: Zn+2 + S-2 → ZnS
30. a. O, b. +3, c. +1-1, d. +4-2, e. +1-1, f. +2+6-2, g. +1+5-2, h. +3-2, i. +4-2
31. a. Oxidation, b. Reduction
32. a. oxidation H2 → 2H + 2e-, reduction Br2+2e- → 2Br b. reduction Cu + 2e- →Cu, oxidation Mg → Mg + 2e-, c. reduction 2Cu + 4e- → 2Cu, oxidation 2O → O2 + 4e-, d. oxidation 8H2 → 16H + 16e-, reduction S8 + 16e- → 8S, e. NOT REDOX
Properties and Changes in Matter and Chemical Reactions Test Review Key
4. 2, 16
5. 16
6. 12
7. combustion, C2H5OH + 3O2 → 2CO2(g) + 3H2O(g)
8. synthesis, Na2O(s) + H2O → 2NaOH
9. double replacement, PbCl4(aq) + 2Na2CrO4(aq) → Pb(CrO4)2(s) + 4NaCl(aq)
10. synthesis, H2(g) + F2(g) → 2HF (g)
11. double replacement, Al2(SO4)3(aq) + 3Ca(OH)2(aq) → 2Al(OH)3(s) + 3CaSO4(s)
12. decomposition, Mg(ClO3)2(s) → MgCl2 + 3O2
13. decomposition, Fe2(CO3)3 → Fe2O3 + 3CO2
14. decomposition, 2KOH → K2O + H2O
15. no reaction, lithium is a light metal
16. decomposition, 2RaO → 2Ra + O2
17. combustion, 2C8H18(l) + 25O2(g) → 16CO2 + 18H2O
18. single replacement, Cl2(g) + 2NaBr(aq) → Br2 + 2NaCl
19. single replacemtn, Ba(s) + 2AgC2H3O2(aq) →2Ag + Ba(C2H3O2)2
20. synthesis, 2Cu(s) + O2(g) → 2CuO
21. synthesis, 4Fe(s) + 3O2(g) → 2Fe2O3
22. double replacement, 2Al(C2H3O2)3(aq) + 3Sr(OH)2(aq) → 3Sr(C2H3O2)2(aq) + 2Al(OH)3(s)
23, 24, 25, 26, 27 no reaction
28. (NH4)2S(aq) + Cd(NO3)2(aq) → CdS(s) + 2NH4NO3(aq) Net Ionic: Cd+2 + S-2 → CdS
29. Zn(NO3)2(aq) + CaS(aq) → ZnS(s) + Ca(NO3)2(aq) Net Ionic: Zn+2 + S-2 → ZnS
30. a. O, b. +3, c. +1-1, d. +4-2, e. +1-1, f. +2+6-2, g. +1+5-2, h. +3-2, i. +4-2
31. a. Oxidation, b. Reduction
32. a. oxidation H2 → 2H + 2e-, reduction Br2+2e- → 2Br b. reduction Cu + 2e- →Cu, oxidation Mg → Mg + 2e-, c. reduction 2Cu + 4e- → 2Cu, oxidation 2O → O2 + 4e-, d. oxidation 8H2 → 16H + 16e-, reduction S8 + 16e- → 8S, e. NOT REDOX