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Created by Master Student

Chemistry Practice Test #3

1 / 30

What is the molar mass of a monoprotic weak acid that requires 26.3 mL of 0.122 M KOH to neutralize 0.682 gram of the acid?

2 / 30

Solvents A and B form an ideal solution. Solvent A has a vapour pressure of 345 torrs at room temperature. At the same temperature, solvent B has a vapour pressure of 213 torrs. What is the vapour pressure of a mixture where the mole fraction of A is 0.285?

3 / 30

How many electrons, neutrons, and protons are in an atom of 52Cr?

4 / 30

The oxidation number of chlorine in the perchlorate ion, ClO4, is

5 / 30

The electron configuration 1s2 2s2 2p6 3s2 3p6 4s2 signifies the ground state of the element

6 / 30

Which of the following is a conjugate acid-base pair?

7 / 30

Which of the following reactions is expected to have the greatest decrease in entropy?

8 / 30

Which of the following is expected to be a polar molecule?

9 / 30

The equilibrium constant, Kc, for the dissociation of HI into hydrogen gas and iodine vapour is 21 at a certain temperature. What will be the molar concentration of iodine vapour if 15 grams of HI gas is introduced into a 12.0-L flask and allowed to come to equilibrium?

10 / 30

The Pauli exclusion principle states that

11 / 30

Helium effuses through a pinhole 5.33 times faster than an unknown gas. That gas is most likely

12 / 30

The ideal gas law is successful for most gases because

13 / 30

What is the equilibrium expression for the reaction

  • A. 
  • B. 
  • C. 
  • D. 

14 / 30

Which of the following correctly lists the individual intermolecular attractive forces from the strongest to the weakest?

  • A. Induced dipole < dipole-dipole < hydrogen bond
  • B. Hydrogen bond < dipole-dipole < induced dipole
  • C. Induced dipole < hydrogen bond < dipole-dipole
  • D. Dipole-dipole < hydrogen bond < induced dipole

15 / 30

Changing which of the following will change the numerical value of the equilibrium constant?

16 / 30

The concentrations of the reactants and products in the reaction represented by the above graph are found to be changing very slowly. Which of the following statements best describes the reaction given that the reaction is exergonic? (ΔG < 0)

17 / 30

The simplest alkene has

18 / 30

Which of the following can form hydrogen bonds?

19 / 30

A mechanism is a sequence of elementary reactions that add up to the overall reaction stoichiometry. A substance that is produced in one elementary reaction and consumed in another is called

20 / 30

All of the following ions have the same electron configuration except

21 / 30

What is the work involved if a gas in a 2.0-litre container at 2.4 atmospheres pressure is allowed to expand against a pressure of 0.80 atmospheres?

22 / 30

How many moles of propane (C3H8) are there in 6.2 g of propane?

23 / 30

A first-order reaction has a half-life of 34 minutes. What is the rate constant for this reaction?

24 / 30

A solution is prepared by dissolving 30.0 grams of Ni(NO3)2 in enough water to make 250 mL of solution. What is the molarity of this solution?

25 / 30

A certain radioactive material has a half-life of 36 minutes. Starting with 10.00 grams of this material, how many grams will be left after 2 hours?

26 / 30

What is the molarity of a sodium hydroxide solution that requires 42.6 mL of 0.108 M HCl to neutralize 40.0 mL of the base?

27 / 30

NO2 + O3 → NO3 + O2 slow
NO3 + NO2 → N2O5 fast

A proposed reaction mechanism for the reaction of nitrogen dioxide and ozone is detailed above. Which of the following is the rate law for the reaction?

28 / 30

The subatomic particle with the most penetrating ability is

29 / 30

A certain reaction has a ΔH° = -43.2 kJ mol-1 and an entropy change ΔS° of +22.0 J mol-1 K-1. What is the value of ΔG° at 800 °C?

30 / 30

The following diagram supports which of the following conclusions about the reaction shown below?

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