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CHEM 115 Proficiency Quiz

CHEM 115 Proficiency Quiz

This is a chemistry proficiency quiz to evaluate your knowledge in concepts of general chemistry and mathematics and your preparedness for Chemistry 115: General Chemistry II. You may utilize a scientific calculator and a periodic table for this quiz. Abstain from using notes, textbooks, or any other resources while you complete this quiz.

Name*
First Last
Calcium phosphate reacts with sulfuric acid, producing calcium sulfate and phosphoric acid. What is the stoichiometric coefficient for sulfuric acid when the chemical equation is balanced using the lowest whole-number coefficients?*
- 1
- 2
- 3
- 4
- None of these
What is the molar mass of Ca(MnO4)2?*
- 159 g/mol
- 199 g/mol
- 216 g/mol
- 278 g/mol
- None of these
How many moles of ethanol are in 1.50 g ethanol (CH3CH2OH)?*
- 0.0145 moles
- 0.0326 moles
- 30.7 moles
- 69.0 moles
- None of these
How many moles of CuO can be produced when 0.450 mol Cu2O react with excess O2 in the following reaction:*
_____Cu2O(s) + _____O2(g) → _____CuO(s)?
- 0.225 mol
- 0.450 mol
- 0.900 mol
- 1.80 mol
- None of these
The following diagram represents the reaction of A2 (unshaded spheres) with B (shaded spheres). What is the balanced chemical equation for this reaction and what is the limiting reactant?*
- A2 + 2B → 2AB; A2 is the limiting reactant.
- A2 + 2B → 2AB; B is the limiting reactant.
- 4A2 + 6B → 6AB; A2 is the limiting reactant.
- 4A2 + 6B → 6AB; B is the limiting reactant.
- None of these
What is the molarity of NaOH in a solution made by dissolving 0.356 g NaOH in enough water to make 250.0 mL of solution?*
- 0.0000356 M
- 0.00142 M
- 0.00890 M
- 0.0356 M
- None of these
The following components were combined in a beaker: 4.0 mL of 0.20 M KCI, 1.0 mL of 0.20 M NaOH, and 3.0 mL water. What is the molarity of NaOH in the new solution?*
- 0.025 M
- 0.040 M
- 0.050 M
- 0.20 M
- None of these
When 200 mL of 0.100 M hydrochloric acid is added to 200 mL of 0.100 M Mg(OH)2, the resulting solution will be:*
- acidic
- basic
- neutral
- ugly
- None of these
How many moles of A2B can be made if 20.0 mL 0.20 M A are combined with 30.0 mL 0.10 M B in the following reaction:*
2A(aq) + B(aq) → A2B(s)
- 0.0010 mol
- 0.0020 mol
- 0.0030 mol
- 0.0040 mol
- None of these
Which of the following compounds produces a basic solution when dissolved in water?*
- CH3OH
- CH3COOH
- HOCl
- KOH
- None of these
Which of the following compounds is NOT an acid?*
- CH3COOH
- NH3
- HNO3
- H2SO4
- A-D are all acids
Which of the following is NOT a strong acid?*
- HF
- HCl
- HBr
- HI
- A-D are all strong acids
What is the correct net ionic equation for the neutralization of HC2H3O2 (aq) with NaOH (aq)?*
- HC2H3O2 (aq) + NaOH (aq) ➔ NaC2H3O2 (aq) + H2O (l)
- HC2H3O2 (aq) + OH- (aq) ➔ C2H3O2- (aq) + H2O (l)
- HC2H3O2 (aq) + Na+ (aq) + OH- (aq) ➔ Na+ (aq) + C2H3O2- (aq) + H2O (l)
- H+ (aq) + C2H3O2- (aq) + Na+ (aq) + OH- (aq) ➔ Na+ (aq) + C2H3O3- (aq) + H2O (l)
- H+ (aq) + OH- (aq) ➔ H2O (l)
A 50.0 mL sample of HCl requires 23.74 mL of 0.500 M potassium hydroxide to reach the equivalence point. What is the molarity of the HCl solution?*
- 0.161 M
- 0.237 M
- 0.475 M
- 1.05 M
- None of these
What is the total pressure in a 10.0-L flask containing 0.127 mol H2(g) and 0.288 mol N2(g) at 20.0°C?*
- 0.306 atm
- 0.681 atm
- 0.693 atm
- 0.998 atm
- None of these
What volume of H2 gas forms at STP when 4.32 g Al reacts with excess NaOH in the following reaction:*
2NaOH (s) + 2Al (s) + 6H2O (l) ➔ 2NaAl(OH)4 (s) + 3H2 (g)
- 2.39 L
- 3.59 L
- 5.38 L
- 5.87 L
- None of these
In the reaction, AgNO3 (aq) + HI (aq) ➔ AgI (s) + HNO3 (aq), the spectator ions are:*
- Ag+ and NO3-
- Ag+ and I-
- H+ and I-
- H+ and NO3-
- None of these
Which pair of compounds is insoluble in water?*
- AgNO3 and KNO3
- Na2S and CuS
- (NH4)2SO4 and AgI
- PbSO4 and Pb3(PO4)2
- None of these
What precipitate forms when excess sodium hydroxide is added to 1 mol chromium (III) nitrate?*
- NaNO3
- NaOH
- Cr3OH
- Cr(OH)3
- No precipitate forms
Use the given standard enthalpies of formation to calculate ∆H° for the following reaction: H2(g) + 2NH3(g) + N2(g) ➔ 2N2H4(g).*
Enthalpies of Formation:
H2 (g): 0.0 kJ/mol
NH3 (g): -46.1 kJ/mol
N2 (g): 0.0 kJ/mol
N2H4 (g): 95.4 kJ/mol
- -283.0 kJ
- +98.0 kJ
- +141.5 kJ
- +283.0 kJ
- None of these
What is the oxidation number of the sulfur atom in H2SO4?*
- -2
- +2
- +4
- +6
- None of these
Which element is reduced in the following reaction:*
5Fe2+ + MnO4- + 8H+ ➔ Mn2+ + 5Fe3+ + 4H2O
- Fe
- Mn
- O
- H
- None of these
Which species functions as the reducing agent in the following oxidation-reduction reaction:*
H2O (l) + ClO- (aq) + 2I- (aq) ➔ I2 (s) + Cl- (aq) + 2OH- (aq)
- H2O
- ClO-
- I-
- 2OH-
- None of these
What are the coefficients in front of NO3- and Cu when the following redox equation is balanced in acidic solution:*
_____NO3- (aq) + _____Cu(s) → _____NO(g) + ______Cu2+ (aq)
- 2, 3
- 2, 6
- 3, 4
- 3, 6
- None of these
For the mathematical equation below, solve for x. Express your answer to 3 significant figures.*
- x = 0.431
- x = 0.43
- x = 2.32
- x = 2.3
- None of these
For the mathematical equation below, solve for x. Express your answer to 3 significant figures.*
- x = 261.16
- x = 261
- x = 0.00383
- x = 0.003829
- None of these
For the mathematical equation below, solve for x. Express your answer to 3 significant figures.*
- x = 74.20
- x = 74.2
- x = 0.01348
- x = 0.0135
- None of these
For the mathematical equation below, solve for x. Express your answer to 3 significant figures.*
- x = 0.00295
- x = 0.000295
- x = 338.8
- x = -0.00295
- None of these
For the mathematical equation below, solve for both roots of x expressed to 3 significant figures.*
- 5.66
- 5.49
- 0.839
- 0.995
- 6.32

Δ

Image Sources

Molecules_Question5: Palomar Community College District
C115_Math1: Palomar Community College District
C115_Math2: Palomar Community College District
C115_Math3: Palomar Community College District
C115_Math4: Palomar Community College District
C115_Math5: Palomar Community College District

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Jennifer Zabzdyr, Office NS-355E

Department Chair/Professor Email: jzabzdyr@palomar.edu Phone: (760) 744-1150, ext. 2510

Vacant, Office NS-355B

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Chemistry Lab Stockroom NS-337

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