Question 1

Which of the following statements about the electron configuration of the selenide ion ($$\mathrm{Se$$^{2-}$$}) is $$correct?

Accepted Answer

It has the same electron configuration as krypton ($$\mathrm{Kr}).$$

Question 2

Which of the following is the correct electron configuration for a neutral selenium atom ($$\mathrm{Se}$$, $$Z=34$$)?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^6$$\ $$3s^2$$\ $$3p^6$$\ $$4s^2$$\ $$3d^{10}$$\ $$4p^4$$

Question 3

Which statement about the oxidation states of oxygen is correct?

Accepted Answer

Oxygen is almost always found in the $$-2$$ oxidation state, except in peroxides and $$\mathrm{OF_2$}.$$

Question 4

Which of the following ions is isoelectronic with $$\mathrm{Al$$^{3+}$$}$$?

Accepted Answer

$$\mathrm{Ne}$$

Question 5

Which statement about the atomic radius of gold ($$\mathrm{Au}) $$and silver ($$\mathrm{Ag}) is $$correct?

Accepted Answer

The atomic radius of $$\mathrm{Au} is $$smaller than that of $$\mathrm{Ag}$$ due to relativistic effects.

Question 6

Which of the following best describes the process of determining the activation energy using the Arrhenius equation?

Accepted Answer

Plot $$\ln k$$ versus $$1/T$$ and determine the slope, which equals $$-E_a/R.$$

Question 7

Given the following rate law: $$	ext{rate} = k[P]^2[Q]$$, what is the overall order of the reaction?

Accepted Answer

3

Question 8

Which of the following is the correct expression for the equilibrium constant $$K$$ for the sublimation of ice to water vapor?

Accepted Answer

$$K = \dfrac{p_{\mathrm{H_2O(g)}}}{p^\circ}$$

Question 9

Which formula correctly relates the standard Gibbs free energy change $$\Delta G^\circ to $$the equilibrium constant $$K$$?

Accepted Answer

$$\Delta G^\circ = -RT \ln K$$

Question 10

Which of the following is the correct application of the Clausius-Clapeyron equation to determine the enthalpy of sublimation ($$\Delta H_{sub}) $$from vapor pressure data?

Accepted Answer

$$\ln p = -\dfrac{\Delta H_{sub}}{R} \dfrac{1}{T} + C$$

Question 11

Which statement about the pH of a 1 mM oxalic acid solution, based on the speciation diagram, is correct?

Accepted Answer

The pH is closest to the value where $$\mathrm{H_2Ox}$$ and $$\mathrm{HOx^-}$$ concentrations are equal.

Question 12

Which of the following statements about the third ionization energy of magnesium is correct?

Accepted Answer

It is much larger than the first and second ionization energies because it removes an electron from a closed shell.

Question 13

Which of the following is a correct statement about the geometry of the monoborate anion ($$\mathrm{BO_3$^{3-}}$$)?

Accepted Answer

It is planar and has trigonal symmetry.

Question 14

Which of the following is the correct value for the Faraday constant ($$F) as $$given in the study materials?

Accepted Answer

$$F = 96485\ \mathrm{C\ $$mol^{-1}$$}$$

Question 15

Which of the following is the correct molar volume of an ideal gas at standard temperature and pressure (STP) as given in the study materials?

Accepted Answer

$$V_m = 24.79\ \mathrm{L\ $$mol^{-1}$$}$$

Question 16

Which of the following statements about redox reactions is correct?

Accepted Answer

A redox reaction involves the transfer of electrons between species, changing their oxidation states.

Question 17

Which of the following is the correct value for the Avogadro constant ($$N_A) as $$given in the study materials?

Accepted Answer

$$N_A = 6.022 	imes 10$$^{23}$$\ \mathrm{$$mol^{-1}$$}$$

Question 18

Which of the following is the correct expression for the rate constant $$k$$ according to the Arrhenius equation?

Accepted Answer

$$k = A e$$^{-E_a/(RT)}$$

General Chemistry: Core Concepts, Calculations, and Applications

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