Mock Exam 3

SI Leader: Sullivan Hanback Name ______

Gen Chem115-2B

  1. What is the molar mass of AlCl3? (in g/mol)
  2. 35.45
  3. 107.92
  4. 133.33
  5. 266.66
  1. Which of the following contains the most atoms?
  2. 54g of Zn
  3. 51g of Cu
  4. 57 g of Rb
  5. 60g of Fr
  1. What is the percent composition of oxygen in tin (IV) phosphate?
  2. 50.6%
  3. 34.8%
  4. 16.0%
  5. 80.7%
  1. In which of the following compounds does the sulfur atom have the highest (most positive) oxidation number?

a. Na2SO4

b. H2S

c. SO2

d. H2SO3

e. S8

Refer to the equation below for questions 5-8

Al (s) + ZnSO4 (aq)  Al2(SO4)3 (aq) + Zn (s)

  1. What are the corresponding stoichiometric coefficients in the balanced equation?
  2. 1,1,1,1
  3. 1,2,1,2
  4. 2,3,1,3
  5. 3,2,1,3
  1. Classify the reaction.
  2. Combination
  3. Displacement
  4. Metathesis
  5. Combustion
  1. If .025kg of Al react with 1046mL of 5M zinc sulfate which is the limiting reactant?
  2. Neither
  3. Both
  4. Al
  5. Zinc sulfate
  1. Using the numbers from question 7 how many grams of zinc will be produced?
  2. 342.09g
  3. 90.92g
  4. 60.45g
  5. 200.28g
  1. Which statement about the reaction below is true, given large amounts of reactants?

Na3PO4 + NiCl2  NaCl + Ni3(PO4)2

a. Na3PO4 is insoluble in water and will precipitate.

b. Ni3(PO4)2 is insoluble in water and will precipitate.

c. NaCl is insoluble in water and will precipitate.

d. Both NaCl + Ni3(PO4)2 are insoluble in water and will precipitate.

e. All compounds in the reaction are soluble in water and no reaction occurs.

  1. Given the incomplete reaction below, which of the following reaction types most accurately describe the complete reaction?

CH3COOH (aq) + FeS (aq) 

  1. Precipitation
  2. Displacement
  3. Acid-base
  4. Gas forming
  1. Which of the following is a strong acid?
  2. Formic acid
  3. Benzoic acid
  4. Hydrocyanic acid
  5. Hydrobromic acid
  1. Which of the following is insoluble?
  2. Magnesium sulfate
  3. Barium acetate
  4. Silver iodide
  5. Potassium oxalate
  1. Will the reaction below occur and if so why?

Sr(ClO4)2 (aq) + Na2SO4 (aq)  ?

  1. No reaction
  2. Yes, a gas forms
  3. Yes, a precipitate forms
  4. Yes, a neutralization occurs
  1. How many grams of CO2 are produced from the reaction of 5.00 g of C2H6 with 25.0 g of O2?

2 C2H6(g) + 7 O2(g)  4 CO2(g) + 6 H2O(g)

a. 3.66 g

b. 7.51 g

c. 14.6 g

d. 20.6 g

e. 30.0 g

  1. What is the net ionic equation for HCl (aq) + Ba(OH)2 (aq)  ?
  2. HCl (aq) + Ba(OH)2 (aq)  BaCl2 (aq) + H2O (l)
  3. 2H+ (aq) + Ba(OH)2 (aq)  Ba2+ (aq) + 2 H2O (l)
  4. H+ (aq) + OH- (aq)  H2O (l)
  5. No reaction
  1. Which of the ions are present in an aqueous solution of lithium perchlorate?
  2. Li+ and Cl-
  3. Li+ and ClO3-
  4. Li+ and ClO4-
  5. Li+ , Cl-, and O2-
  1. Assign oxidation numbers to each atom in calcium nitrate.
  2. Ca +2 N+4 O -2
  3. Ca +1 N -3 O -1
  4. Ca +1 N -3 O -2
  5. Ca +2 N +5 O -2
  1. Which reaction will not occur?

a. Mg(s) + CaSO4(aq)  MgSO4(aq) + Ca(s)

b. H2(g) + AgNO3(aq)  HNO3(aq) + Ag(s)

c. Mg(s) + CuSO4(aq)  Cu(s) + MgSO4(aq)

d. Al(s) + SnCl2(aq)  AlCl3(aq) + Sn(s)

e. Ba(s) + HCl(aq)  BaCl2(aq) + H2(g)

  1. Linette starts with a 750mL stock solution of HCl that is 5M she wishes to dilute the solution until the molarity is 2.75M. How many liters of water should this rookie add?
  2. 0.61 L
  3. 1.36L
  4. 5.25L
  5. 1.05L
  1. Which are reduced in the following reaction?

2Al (s) + 3Cl2 (g)  AlCl3 (s)

  1. Cl2
  2. Al
  3. AlCl3
  4. Not a redox reaction
  1. In the reaction shown in number 20, if there are 18 grams of Al and excess chlorine how much product is produced?
  2. 88 g
  3. 24g
  4. 65 g
  5. 44g
  1. If Felix runs an experiment with the 18 grams of Al discussed in the last problem and recovers 16 grams of product then what is the percent yield of the reaction?
  2. 50%
  3. 36%
  4. 24%
  5. 18%
  1. In the following reaction what is the reducing agent?

2Na (aq) + 2H2O (l) 2NaOH (aq) + H2 (g)

  1. Sodium hydroxide
  2. Hydrogen
  3. Water
  4. Sodium
  1. Which of the following would form as a precipitate in a reaction?
  2. NH4Cl
  3. LiBr
  4. PbI2
  5. Ca(ClO3)2
  1. If you react a strong acid (SA) and a strong base (SB) what will be the net ionic reaction?
  2. No reaction will occur
  3. SA + SB  water
  4. H+ + OH-  water
  5. SA + SB  salt + water

Use the following unbalanced equation for questions 26 and 27:

H3PO4 (aq) + NaOH (aq)  Na3PO4 (aq) + H2O (l)

  1. In the balanced equation, what is the coefficient in front of water?
  2. 1
  3. 2
  4. 3
  5. 4
  1. If 36.0 mL of H3PO4 react exactly with 80.0 mL of 0.500 M NaOH, what is the concentration of the phosphoric acid?
  2. 0.37 M
  3. 0.25 M
  4. 1.0 M
  5. 0.50 M
  1. Which of the following best describes molarity (M)?
  2. Moles of solute/ liters of solvent
  3. Moles of solute * liter of solvent
  4. Moles of solute/ liters of solution
  5. Moles of solute* liters of solution
  1. Linoleic acid has an elemental composition of 77.1% carbon, 11.5% hydrogen, and the remainder is oxygen. Mass spectrometry tells us the molar mass is 280.45g/mol. What are the empirical and molecular formulas?
  1. Identify the expected products and type of reaction:

a) CaCO3(aq) + HCl(aq) 

Type of reaction: ______

Balanced overall equation:

Balanced net ionic equation:

b) FeCl2(aq) + (NH4)2S(aq) 

Type of reaction: ______

Balanced overall equation:

Balanced net ionic equation:

c) CH3COOH(aq) + Ba(OH)2(aq) 

Type of reaction: ______

Balanced overall equation:

Balanced net ionic equation: