Reactions Review

Reactions Review

____ 1. All of the following are clues that a chemical reaction has taken place except

A. / a color change
B. / a solid forms
C. / the reactant is smaller
D. / a flame occurs
E. / bubbles form

____ 2. When the following equation is balanced with the smallest whole number coefficients, what is the coefficient for O2?

C3H8(g) + O2(g) --> CO2(g) + H2O(g)

A. / 4
B. / 5
C. / 10
D. / 7
E. / None of the above

____ 3. When the equation

Cr2S3 + HCl --> CrCl3 + H2S

is balanced in standard form, one of the terms in the balanced equation is

A. / 3HCl
B. / 3H2S
C. / 2Cr2S3
D. / CrCl3

____ 4. The most common factors that cause chemical reactions to occur are all of the following except

A. / formation of a solid
B. / formation of a gas
C. / formation of water
D. / a decrease in temperature
E. / transfer of electrons

____ 5. When an acid reacts with a base, which product always forms?

A. / hydrogen and carbon dioxide
B. / water
C. / hydrogen
D. / carbon dioxide
E. / None of the above

____ 6. The reaction 2K(s) + Br2(l) --> 2KBr(s) is a(n) _____ reaction.

A. / double-displacement
B. / precipitation
C. / oxidation-reduction
D. / single-replacement
E. / acid-base

____ 7. The reaction AgNO3(aq) + NaCl(aq) --> AgCl(s) + NaNO3(aq) is a(n) _____ reaction.

A. / none of these
B. / precipitation
C. / acid-base
D. / oxidation-reduction
E. / single-replacement

____ 8. The reaction HCl(aq) + KOH(aq) --> H2O(l) + KCl(aq) is a(n) _____ reaction.

A. / oxidation-reduction
B. / precipitation
C. / single-replacement
D. / acid-base
E. / None of the above

____ 9. In what type of reaction is water always a product?

A. / decomposition
B. / acid-base
C. / precipitation
D. / synthesis
E. / oxidation

____ 10. Classify the following reaction:

2Mg(s) + O2(g) --> 2MgO(s).

A. / combustion
B. / synthesis
C. / oxidation-reduction
D. / two of these
E. / Oxidation-reduction, combustion, and synthesis are all correct.

____ 11. Classify the following reaction:

HNO3(aq) + KOH(aq) --> KNO3(aq) + H2O(l).

A. / combustion
B. / precipitation
C. / acid-base
D. / oxidation-reduction
E. / two of these

____ 12. The equation

2Al(s) + 2Br3(l) --> 2AlBr3(s)

is a(n) _____ reaction.

A. / oxidation-reduction only
B. / combustion
C. / oxidation-reduction and synthesis
D. / decomposition
E. / synthesis only

____ 13. A reaction that involves a transfer of electrons is called a(n) _____ reaction.

A. / acid-base
B. / oxidation-reduction
C. / double-displacement
D. / precipitation
E. / None of the above

____ 14. The equation

2Ag2O(s) --> 4Ag(s) + O2(g)

is a(n) _____ reaction.

A. / synthesis
B. / combustion
C. / oxidation-reduction
D. / decomposition
E. / two of these

____ 15. The equation

CH4(g) + 2O2(g) --> CO2(g) + 2H2O(g)

is a(n) _____ reaction.

A. / decomposition
B. / combustion
C. / oxidation-reduction
D. / synthesis
E. / two of these

16. Solid calcium carbide, CaC2, will react with water to produce acetylene gas, C2H2, and aqueous calcium hydroxide. Write the balanced equation for this reaction.

17. Balance the following equation for the reaction where hydrogen sulfide gas burns in oxygen gas to form gaseous water and sulfur dioxide gas.

H2S(g) + O2(g) --> SO2(g) + H2O(g)

18. Balance the equation

NaBH4 + BF3 --> NaBF4 + B2H6

19. Balance the equation

MgCl2 + K3PO4 --> Mg3(PO4)2 + KCl.

20. Balance the equation

C6H14 + O2 --> CO2 + H2O.

21. Balance the equation

As2O3(s) + Ca(OH)2(aq) --> Ca3(AsO4)2(s) + H2O(l).

22. Balance the equation

Mg(OH)2(aq) + HBr(aq) --> MgBr2(aq) + H2O(l).

23. Balance the equation

Sb(s) + O2(g) --> Sb2O3(s).

24. Balance the equation

Mg(s) + H3PO4(aq) --> Mg3(PO4)2(aq) + H2(g).

25. Balance the equation

KClO3(s) --> KCl(s) + O2(g).

26. Balance the equation

H2SO4(aq) + KOH(aq) --> K2SO4(aq) + H2O(l).

27. Balance the equation

Ba(OH)2(aq) + H3PO4(aq) --> Ba3(PO4)2(aq) + H2O(l).

28. Balance the equation

NaNO3(s) --> NaNO2(s) + O2(g).

29. Balance the equation

Al(s) + H2SO4(aq) --> Al2(SO4)3(aq) + H2(g).

30. Balance the equation

Mg(s) + O2(g) --> MgO(s).

31. Balance the equation

BaCl2(aq) + H2SO4(aq) --> BaSO4(s) + HCl(aq).

32. Balance the equation

Pb(NO3)2(aq) + K2CrO4(aq) --> PbCrO4(s) + KNO3(aq).

33. Balance the equation

(NH4)2Cr2O7(s) --> N2(g) + H2O(g) + Cr2O3(s).

34. Balance the equation for the reaction of calcium metal with oxygen gas to produce solid calcium oxide.

35. Balance the equation for the reaction of aluminum metal with solid iodine to form solid aluminum iodide.

36. Balance the equation for the reaction of potassium metal with water to form potassium hydroxide and hydrogen gas.

37. Balance the equation

Na(s) + H2O(l) --> H2(g) + NaOH(aq).

38. Balance the equation

Ca(s) + O2(g) --> CaO(s).

39. Balance the equation

Mg3N2(s) + H2O(l) --> NH3(g) + Mg(OH)2(s).

40. Balance the equation

CaCO3(s) + HCl(aq) --> H2O(l) + CO2(g) + CaCl2(aq).

41. Balance the equation

Fe(NO3)2(aq) + H2S(g) --> FeS(s) + HNO3(aq).

42. Balance the equation

C8H18(l) + O2(g) --> CO2(g) + H2O(g).

43. Balance the equation

K(s) + H2O(l) --> KOH(aq) + H2(g).

44. Balance the equation

NH3(g) + O2(g) --> NO(g) + H2O(l).

45. Balance the equation

Al(s) + S(s) --> Al2S3(s).

46. Balance the equation

Zn(s) + H3PO4(aq) --> Zn3(PO4)2(s) + H2(g).

47. Write the molecular equation, the complete ionic equation, and the net ionic equation for the following reaction: Aqueous solutions of copper(II) nitrate and sodium hydroxide are mixed to form solid copper(II) hydroxide and aqueous sodium nitrate.

48. Balance the molecular equation when aqueous potassium hydroxide reacts with aqueous sulfuric acid to yield water and aqueous potassium sulfate.

49. Balance the equation

HCl(aq) + Ca(OH)2(aq) --> CaCl2(aq) + H2O(l)