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Which of the following statements are correct.
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
Which atom has the lowest first ionization energy?
Which one of the following bonds is the most ionic in character?
Check all that are FALSE.
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
Elements in a group (column) of the Periodic Table have chemical properties that show many similarities because:
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
Which of the following statements is true?
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.
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)?
Each gas would have the same number of molecules at STP
The rate of K depends on...
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
Which of the following statements are correct?
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
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:
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
For catalysts, check all of the following statements that are true:
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
For a reaction at equilibrium, which are true? Check all that apply.
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
If Q is less than K, the reaction shifts to the right.