4.6-10 Qz (BL 4.3-4)
Due Sep 7 at 11:59pm
Points 26
Questions 26
Available Aug 29 at 12am - Sep 10 at 11:59pm
Time Limit None
Allowed Attempts 2
Instructions
4.6-10 Qz Solubility, stoich of ppt rxns, acid-base, redox.
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Attempt 1
639 minutes
26 out of 26
 Answers will be shown after your last attempt
Score for this attempt: 26 out of 26
Submitted Sep 7 at 10:16pm
This attempt took 639 minutes.
Question 1
All of the following are characteristics of nonmetals except:
tend to form negative ions in chemical reactions with metals
appear in the upper left-hand corner of the periodic table
poor conductors of electricity
often bond to each other by forming covalent bonds
1 / 1 pts
Question 2
1 / 1 pts
What is the subscript of barium in the formula of barium sulfate?
0
1
3
4
2
Question 3
1 / 1 pts
What is the correct name for NO2?
dinitrogen monoxide
nitrogen oxide
nitrite
nitrogen dioxide
Question 4
1 / 1 pts
Roundup, an herbicide manufactured by Monsanto, has the formula
C3H8NO5P. How many moles of molecules are there in a 295.1-g sample
of Roundup?
2.137
0.5729
16.39
1.745
Question 5
1 / 1 pts
A hydrocarbon (a compound consisting solely of carbon and hydrogen) is
found to be 85.6% carbon by mass. What is the empirical formula for this
compound?
C3H
CH2
C2H
CH
Question 6
1 / 1 pts
Consider a specific chemical reaction represented by the equation aA +
bB → cC + dD. In this equation the letters A, B, C, and D represent
chemicals, and the letters a, b, c, and d represent coefficients in the
balanced equation.
How many possible values are there for the quantity "c/d"?
4
3
2
1
Question 7
1 / 1 pts
Reaction of methane with oxygen really proceeds in two steps:
A sample of CH4 is burned in an excess of O2 to give 3.0 moles of H2O.
How many moles of CH4 were in the original sample? (This can be done
without a calculator).
2.0
0.8
6.0
1.5
Question 8
1 / 1 pts
An unknown substance dissolves readily in water but not in benzene (a
nonpolar solvent). Molecules of what type are present in the substance?
nonpolar
polar
neither polar nor nonpolar
either polar or nonpolar
Question 9
1 / 1 pts
All of the following are weak acids except
HF
HCNO
HBr
HNO2
Question 10
1 / 1 pts
Diabetics often need injections of insulin to help maintain the proper blood
glucose levels in their bodies. How many moles of insulin are needed to
make up 45 mL of 0.0062 M insulin solution?
0.14 mol
0.00028 mol
0.00056 mol
7.3 mol
1 / 1 pts
Question 11
The following reactions:
Pb2+ + 2I- ® PbI2
2Ce4+ + 2I- ® I2 + 2Ce3+
HOAc + NH3 ® NH4+ + OAcare examples of
acid-base reactions
redox, acid-base, and precipitation reactions, respectively
precipitation, redox, and acid-base reactions, respectively
precipitation, acid-base, and redox reactions, respectively
1 / 1 pts
Question 12
How many of the following salts are expected to be insoluble in water?
sodium sulfide
barium nitrate
ammonium
sulfate
potassium
phosphate
none
3
1
2
Question 13
1 / 1 pts
Aqueous solutions of barium chloride and silver nitrate are mixed to form
solid silver chloride and aqueous barium nitrate.
The balanced complete ionic equation contains which of the following
terms?
NO3- (aq)
2Ba2+(aq)
2Ag+(aq)
Cl-(aq)
Question 14
1 / 1 pts
Aqueous solutions of barium chloride and silver nitrate are mixed to form
solid silver chloride and aqueous barium nitrate.
The balanced molecular equation contains which one of the following
terms?
BaNO3 (aq)
AgCl (s)
2AgCl (s)
2Ba(NO3)2 (aq)
Question 15
1 / 1 pts
A 3.00-g sample of an alloy (containing only Pb and Sn) was dissolved in
nitric acid (HNO3). Sulfuric acid was added to this solution, which
precipitated 2.37 g of PbSO4. Assuming that all of the lead was
precipitated, what is the percentage of Sn in the sample? (molar mass of
PbSO4 = 303.3 g/mol)
0.781% Sn
54.0% Sn
79.0% Sn
46.0% Sn
Question 16
1 / 1 pts
A 0.307-g sample of an unknown triprotic acid is titrated to the third
equivalence point using 35.2 mL of 0.106 M NaOH. Calculate the molar
mass of the acid.
171 g/mol
165 g/mol
151 g/mol
247 g/mol
Question 17
1 / 1 pts
With what volume of 5.00 M HF will 4.72 g of calcium hydroxide react
completely, according to the following reaction?
637 mL
25.5 mL
127 mL
12.7 mL
Question 18
1 / 1 pts
In the following reaction, which species is oxidized?
8NaI + 5H2SO4 → 4I2 + H2S + 4Na2SO4 + 4H2O
sulfur
hydrogen
iodine
sodium
Question 19
Solve without using a calculator.
1 / 1 pts
460. mL
480. mL
140. mL
120. mL
Question 20
What is the correct balanced net ionic equation for the reaction
illustrated?
1 / 1 pts
Question 21
1 / 1 pts
A hypothetical element consists of two isotopes of masses 69.95 amu and
71.95 amu with abundances of 25.7% and 74.3%, respectively. What is
the average atomic mass of this element?
71.4 amu
70.95 amu
69.95 amu
70.5 amu
Question 22
1 / 1 pts
The molar mass of an insecticide, dibromoethane, is 187.9 g/mol. Its
molecular formula is C2H4Br2. What percent by mass of bromine does
dibromoethane contain?
12.78%
85.05%
2.14%
42.52%
Question 23
1 / 1 pts
The beakers shown below have different precisions as shown.
Suppose you pour the water from these three beakers into one container.
What would be the volume in the container reported to the correct number
of significant figures?
98.43 mL
98.427 mL
99 mL
98.4 mL
98 mL
Question 24
1 / 1 pts
How many grams of H2O will be formed when 32.0 g H2 is mixed with
12.0 g of O2 and allowed to react to form water?
13.5 g
3.4 g
6.8 g
286 g
Question 25
1 / 1 pts
Which of the following solutions contains the largest number of ions?
500. mL of 0.100 M FeCl3
600. mL of 0.200 M AlCl3
400. mL of 0.100 M Al(NO3)3
700. mL of 0.200 M NaOH
Question 26
1 / 1 pts
Spectator ions are those that are in solution, but do not react. Identify any
spectator ions for the reaction of sodium phosphate with calcium nitrate.
only PO43-(aq)
Ca2+(aq) and PO43-(aq)
Na1+(aq) and NO31-(aq)
Na1+(aq) and PO43-(aq)
Quiz Score: 26 out of 26