915796
Descripción
Test por Christine Sang, actualizado hace más de 1 año
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Creado por Christine Sang
hace más de 10 años
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Pregunta 1
Pregunta
Which of the following statements are correct.
Respuesta
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i) The radius of the O*2 ion is great than that of the O atom
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ii) The first ionization energy of Se is greater than that of Br
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iii) The electronegativity of O is less than of C
Pregunta 2
Pregunta
Which atom has the lowest first ionization energy?
Respuesta
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Li
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Na
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K
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Mg
Pregunta 3
Pregunta
Which one of the following bonds is the most ionic in character?
Respuesta
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Be-N
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Li-F
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Be-F
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B-N
Pregunta 4
Pregunta
Check all that are FALSE.
Respuesta
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Electrons occupy orbitals in a way that maximizes the energy of the atom
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No two electrons in an atom may have all 4 quantum numbers alike
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When orbitals of different energies (degenerate) are available, electrons initially occupy these orbitals singly
Pregunta 5
Pregunta
Elements in a group (column) of the Periodic Table have chemical properties that show many similarities because:
Respuesta
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They have the same number of electrons
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Their orbitals are the same size
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Their orbitals are the same shape
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They have the same number of valence electrons
Pregunta 6
Pregunta
Which of the following statements is true?
Respuesta
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Under the same conditions of temperature and pressure, H2 molecules move faster, on average than O2 molecules.
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Under the same conditions of temperature and pressure, the average kinetic energy of O2 molecules is less than that of H2 molecules.
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The volume is 1.00 mol of an ideal gas at 25.0 degrees Celsius, 1.00 atm is 22.4 L
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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.
Pregunta 7
Pregunta
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)?
Respuesta
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CO2
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O2
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O3
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Each gas would have the same number of molecules at STP
Pregunta 8
Pregunta
The rate of K depends on...
Respuesta
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the concentration of the reactants and the temperature
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the nature of the reactants and the order of the reaction
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the nature of the reactants and the temperature
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the order of the reaction and the concentration of the reactants
Pregunta 9
Pregunta
Which of the following statements are correct?
Respuesta
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A catalyst speeds up a reaction by changing △H, the enthalpy of the reaction
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Addition of a catalyst to a reaction changes the equilibrium constant
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A catalyst increases the rates of both the forward and reverse reactions
Pregunta 10
Pregunta
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:
Respuesta
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the reaction rate is half that of the first case
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the reaction rate is twice that of the first case
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the rate constant is half of what it is in the first case
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the rate constant is twice as much as in the first case
Pregunta 11
Pregunta
For catalysts, check all of the following statements that are true:
Respuesta
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Catalysts increase the rate of the reverse reaction
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Catalysts change the equilibrium constant so as to shift the equilibrium to the right
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Catalysts lower the activation energy
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Catalysts are not consumer in the reaction
Pregunta 12
Pregunta
For a reaction at equilibrium, which are true? Check all that apply.
Respuesta
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the concentrations of the reactants and products are not changing
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the enthalpy change for the reaction is zero
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the rate of the forward reaction is the same as the rate of the reverse reaction
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the Gibbs free energy is a minimum
Pregunta 13
Pregunta
If Q is less than K, the reaction shifts to the right.
Respuesta
- True
- False
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