CFA: Chemical Reactions Fall 2010
Honors Chemistry
I. Matching: Match the description in Column B with the correct term in Column A. Write the letter in the blank provided. Each term matches with only one description, so be sure to choose the best description for each term.
Column A / Column B_____ 1. chemical reaction / A. numbers used to balance chemical equations
_____ 2. reactant / B. substance that enters into a chemical reaction
_____ 3. product / C. process in which a new substance is formed
_____ 4. coefficients / D. written on the right side of the arrow in a chemical equation
II. Multiple Choice: Choose the one best answer and write its letter in the blank.
_____ 5. Which of the following statements is INCORRECT?
a) An equation is balanced by changing subscripts as needed.
b) Chemical equations are balanced to show that matter is conserved.
c) Reactants are substances written to the left of the arrow.
d) Coefficients indicate the relative number of molecules of each substance in a chemical reaction.
_____ 6. Which set of coefficients balance the following equation?
AlCl3 + NaOH Al(OH)3 + NaCl
a) 1, 3, 1, 3 c) 1, 1, 1, 3
b) 3, 1, 3, 1 d) 3, 1, 1, 1
_____ 7. When the equation Al + O2 Al2O3 is balanced using smallest whole number
coefficients, what is the coefficient for Al2O3?
a) 1 c) 3
b) 2 d) 4
_____ 8. The formula for chlorine gas is
a) Cl c) Cl (g)
b) Cl2 (g) d) 2Cl (g)
_____ 9. In the chemical equation 2 H2(g) + O2(g) 2H2O(l) the term to the right of the arrow means
a) 2 grams of water c) 2 molecules of water
b) 2 liters of water d) 2 atoms of water
_____ 10. Which is the best description of NaCl(aq)?
a) sodium chloride molecules dissolved in water
b) sodium chloride crystallized from water solution
c) sodium atoms and chloride atoms dissolved in water
d) sodium ions and chloride ions dissolved in water
_____ 11. How many nitrate ions represented in the equation
Fe2(SO4)3(aq) + 3 Ba(NO3)2(aq) 3 BaSO4(s) + 2 Fe(NO3)3(aq)
a) two b) three c) six d) eighteen
_____ 12. When the equation
NaOH(aq) + CaCl2(aq) Ca(OH)2(s) + NaCl(aq) is balanced using smallest whole number
coefficients, what is the coefficient for NaOH?
a) 1 b) 2 c) 3 d) 4
_____ 13. A student proposed the following equation for the reaction that takes place when a
piece of magnesium is burned in air to produce the white powder called magnesium oxide.
Mg(s) + O2 (g) MgO(s)
Which statement is true?
a) The equation is unbalanced with respect to charge
b) The equation contains one or more incorrect formulas
c) The equation is unbalanced with respect to number of atoms
d) The equation contains a mistake in phase notation
_____ 14. Which choice below is evidence that a chemical reaction has occurred?
a) color change
b) bubbles form
c) energy is produced or absorbed
d) all of the above are evidence of a chemical change
III. Free Response
Balance the following chemical equations:
15. ____PbI2 +____ AgNO3 ___ Pb(NO3)2 + ___ AgI
16. ___Mg +___ TiCl4 ___MgCl2 + ___ Ti
17. ___C3H8 + ___ O2 ___CO2 + ___ H2O
18. ___P4 + ___ O2 ___P4O10
19. ___Na2CO3 + ___ HCl ___ NaCl + ___ CO2 + ___ H2O
Predict the products and write balanced equations for the following reactions:
20. zinc + hydrochloric acid
21. barium chloride + ammonium sulfate
22. calcium hydroxide + nitric acid
23. calcium carbonate + hydrochloric acid
24. bromine + sodium iodide
25. magnesium + iron(III) chloride
Write balanced equations for the following reactions. Include physical states.
26. Butane (C4H10) gas burns in oxygen
Matching: Match the description in Column B with the correct term in Column A. Write the letter in the blank provided. Each term matches with only one description, so be sure to choose the best description for each term.
Column A / Column B_____ 27. combustion reaction / A. electrons are transferred
_____ 28. synthesis reaction / B. AB A + B
_____ 29. spectator ions / C. AB(aq) + CD(aq) AD(s) + CB(aq)
_____ 30. oxidation-reduction reaction / D. A + B AB
_____ 31. double-displacement reaction / E. A + BC B + AC
_____ 32. decomposition reaction / AB. produces CO2 and H2O
_____ 33. single-replacement reaction / AC. do not take part in the reaction
Multiple Choice
Choose the one best answer and write its letter in the blank. For questions 34 – 38, identify the type of reaction form the following choices:
a) combination (synthesis) b) single replacement c) combustion d) decomposition
e) double displacement
_____ 34. 2 Na (s) + Cl2 (g) 2 NaCl (s)
_____ 35. NaI (aq) + AgNO3 (aq) NaNO3 (aq) + AgI (s)
_____ 36. 2 KClO3 (s) 2 KCl (s) + 3 O2 (g)
_____ 37. F2 (g) + 2 NaBr (s) 2 NaF (s) + Br2 (l)
_____ 38. CH4 (g) + 2 O2 (g) CO2 (g) + 2 H2O (g)
_____ 39. What are the products of the reaction Na3PO4 + ZnSO4
a) Na3SO4 + ZnPO4
b) NaSO4 + ZnPO4
c) Na2SO4 + ZnPO4
d) Na2SO4 + Zn3(PO4)2
_____ 40. What are the spectator ions in the following reaction?
ZnCl2 (aq) + LiOH (aq) Zn(OH)2 (s) + LiCl (aq)
a) Zn2+ and OH- c) Li+ and OH-
b)Zn2+ and Cl- d) Li+ and Cl-
_____ 41. Which substance is INSOLUBLE in water?
a) NH4Cl c) Ca(NO3)2
b) BaSO4 d) Na2SO4
_____ 42. Which of the following is an oxidation-reduction reaction?
a) LiOH (aq) + HCl (aq) H2O (l) + LiCl (aq)
b) AgNO3 (aq) + H2SO4 (aq) Ag2SO4 (s) + HNO3 (aq)
c) Fe (s) + O2 (g) Fe2O3 (s)
d) AlCl3 (aq) + NaOH (aq) Al(OH)3 (s) + NaCl (aq)
_____ 43. Which type of substance would produce an aqueous solution that is a good conductor of electricity?
a) Strong electrolyte c) Nonelectrolyte
b) Weak electrolyte d) All of these
_____ 44. Aqueous solutions of sodium iodide and lead (II) nitrate are mixed. A yellow
precipitate forms. The balanced net ionic equation for this reaction would be:
a) Na+ (aq) + NO3-(aq) NaNO3 (s)
b) Na+ (aq) + I-(aq) NaI (s)
c) Pb2+ (aq) + 2 NO3- (aq) Pb(NO3)2 (s)
d) Pb2+(aq) + 2 I- (aq) PbI2 (s)
_____ 45. The reaction in Question 44 is an example of which type of reaction?
a) decomposition c) combination (synthesis)
b) double replacement d) single replacement
_____ 46. Aqueous solutions of potassium hydroxide and nitric acid are mixed. The net
ionic equation for this reaction is:
a) H+(aq) + OH- (aq) H2O (l)
b) K+(aq) + NO3-(aq) KNO3 (s)
c) K+(aq) + OH-(aq) KOH (s)
d) H+(aq) + NO3-(aq) HNO3 (s)
_____ 47. The reaction in Question 46 is an example of which type of reaction?
a) oxidation-reduction c) single replacement
b) double replacement d) combustion
Free Response:
Aqueous solutions of copper (II) sulfate and sodium sulfide are mixed. A solid forms.
48. Write a molecular equation for this reaction. Include physical states.
49. Write a complete ionic equation for this reaction. Include physical states.
50. Write a net ionic equation for this reaction. Include physical states.