Download Title - Iowa State University

Leader: Prina
Course: Chem 177
Supplemental Instruction
Instructor: Dr. Greenbowe
Iowa State University
Date: 10/05/2014
1) Cu(s)+ HNO3(aq) -> Cu(NO3)2 (aq) + NO (g) + H2O(l)
a) Starting with 9.07 g of copper and 36.0 g of nitric acid, identify the limiting reagent and justify your
claims with calculations.
Exam Review 2
b) How many moles of NO are produced by the reaction of 4 moles of copper with excess HNO 3?
c) How many grams of NO are produced by the reaction of 6.35 g of Cu with excess HNO3?
2) Balance and identify the following types of reactions:
NaClO3 (s)-> NaCl(aq)+ O2(g)
C8H18(l)+ O2(g)-> CO2(g)+ H2O(l)
H2CO3(s)-> H2O(l) +
N2 (g) + H2(g)->
CO2(g)
NH3 (g)
Na2O(s)+ H2O(l)-> NaOH (aq)
3) The end point for an acid-base titration is called:
a) Equivalence point b) Static point
c) acid point
d) none of these
4) Which of the following is a strong electrolyte?
a) CH3OH
b) HCOOH
c)KNO3
d) all of these
5) Which of the following would be insoluble?
a) CaS
b) KOH
c) Pb(NO3)2
d) SrSO4
e)both a and d
6) Which of the following are insoluble? I.Ag2SO4 II. Ni3PO4 III. NaI
a) I only
b) II only
c) III only
d) I and II
e)I, II and II
7) Aqueous sodium carbonate reacts with barium chloride
Molecular equation:
Ionic equation:
Spectator ions:
Net ionic equation:
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8) When KClO4 dissolves in water, what does it ionize into?
a) K & ClO4
b) K+, Cl- & O2c) K+ & ClO4- d) KClO4
9) Carbon disulfide (CS2), sugar (C6H12O6) and pure water are examples of
a) strong electrolytes b) Weak electrolytes c) non-electrolytes
d)base
10) Which one of these produces the largest number of particles per mole of dissolved solute in water?
a) NaCl
b) C2H6
c) (NH4)2SO4
d) K3PO4
e) MgCl2
11) What is the molarity of a solution that has 86g of sugar (MM sugar: 342g/mol) mixed in 56.5ml of water?
a)2.25M
b)4.45M
c) 6.5M
d) 3.75M
12) Empirical formula for a substance is CH2O and has a molar mass 180g/mol. What is the molecular formula?
a) C6H12O6
b)CH2O
c)C2H4O2
d)C3H6O3
13) Write down the empirical formula of the following compound given the following information:
63.5% Silver, 8.2% Nitrogen and remaining oxygen.
14) What is the molarity of sulfuric acid if 70ml of 0.56M NaOH is required to titrate 50.5ml of sulfuric acid?
a) 0.39M
b) 0.19M
c)0.77M
d) none of these
15) Given the following reaction CH4+ O2-> CO2+ H2O, how many grams of methane are required to produce
80g of water, given that we have excess oxygen?
a) 35.5g
b)45.2g
c)71.04g
d)17.76g
16) How many moles of sulfur are present in 45g of Al2(SO4)3? (MM: 342g/mol)
a)0.132 moles of S
b) 0.392 moles of S
c)0.78moles of S
17) For the balanced equation shown below, if the reaction of 20.7 g of CaCO3 produces 6.81 g of CaO, what is
the percent yield? CaCO3-> CaO + CO2
a) 59%
b) 30%
c) 62%
d) 33%
18) If it takes 50ml of 0.5M KOH solution to completely neutralize 125 ml of sulfuric acid solution, what is the
concentration of sulfuric acid?