MCAT Chemistry Practice Test

Christine Sang
Quiz by , created over 5 years ago

SAT MCAT Quiz on MCAT Chemistry Practice Test, created by Christine Sang on 05/22/2014.

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Christine Sang
Created by Christine Sang over 5 years ago
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Question 1

Question
Which of the following statements are correct.
Answer
  • i) The radius of the O*2 ion is great than that of the O atom
  • ii) The first ionization energy of Se is greater than that of Br
  • iii) The electronegativity of O is less than of C

Question 2

Question
Which atom has the lowest first ionization energy?
Answer
  • Li
  • Na
  • K
  • Mg

Question 3

Question
Which one of the following bonds is the most ionic in character?
Answer
  • Be-N
  • Li-F
  • Be-F
  • B-N

Question 4

Question
Check all that are FALSE.
Answer
  • Electrons occupy orbitals in a way that maximizes the energy of the atom
  • No two electrons in an atom may have all 4 quantum numbers alike
  • When orbitals of different energies (degenerate) are available, electrons initially occupy these orbitals singly

Question 5

Question
Elements in a group (column) of the Periodic Table have chemical properties that show many similarities because:
Answer
  • They have the same number of electrons
  • Their orbitals are the same size
  • Their orbitals are the same shape
  • They have the same number of valence electrons

Question 6

Question
Which of the following statements is true?
Answer
  • Under the same conditions of temperature and pressure, H2 molecules move faster, on average than O2 molecules.
  • Under the same conditions of temperature and pressure, the average kinetic energy of O2 molecules is less than that of H2 molecules.
  • The volume is 1.00 mol of an ideal gas at 25.0 degrees Celsius, 1.00 atm is 22.4 L
  • The volume of 1.00 mol of H2 gas is only 1/16th of the volume of 1.00 mol of O2 gas, at the same temperature and pressure.

Question 7

Question
If you have 11.2 liters of each of the following gases at STP, which one would contain the least molecules (if the gases behave ideally)?
Answer
  • CO2
  • O2
  • O3
  • Each gas would have the same number of molecules at STP

Question 8

Question
The rate of K depends on...
Answer
  • the concentration of the reactants and the temperature
  • the nature of the reactants and the order of the reaction
  • the nature of the reactants and the temperature
  • the order of the reaction and the concentration of the reactants

Question 9

Question
Which of the following statements are correct?
Answer
  • A catalyst speeds up a reaction by changing △H, the enthalpy of the reaction
  • Addition of a catalyst to a reaction changes the equilibrium constant
  • A catalyst increases the rates of both the forward and reverse reactions

Question 10

Question
The conversion of tert-butyl bromide to tert-butyl alcohol has been found to be first-order with respect to tert-butyl bromide. This reaction was carried out twice. The conditions in the two instances were identical, except that in the second case, the concentration of tert-butyl bromide was twice as high as it was in the first case. In the second case:
Answer
  • the reaction rate is half that of the first case
  • the reaction rate is twice that of the first case
  • the rate constant is half of what it is in the first case
  • the rate constant is twice as much as in the first case

Question 11

Question
For catalysts, check all of the following statements that are true:
Answer
  • Catalysts increase the rate of the reverse reaction
  • Catalysts change the equilibrium constant so as to shift the equilibrium to the right
  • Catalysts lower the activation energy
  • Catalysts are not consumer in the reaction

Question 12

Question
For a reaction at equilibrium, which are true? Check all that apply.
Answer
  • the concentrations of the reactants and products are not changing
  • the enthalpy change for the reaction is zero
  • the rate of the forward reaction is the same as the rate of the reverse reaction
  • the Gibbs free energy is a minimum

Question 13

Question
If Q is less than K, the reaction shifts to the right.
Answer
  • True
  • False