Q: Which of the following is the correct expression for the energy of an electron in the nth energy level of a hydrogen atom?

$$E_n = -\frac{2.18 \times 10$$^{-18}$$ J}{n^2$}$$

Question 1

Which of the following is the correct ground state electron configuration for Rhodium (Rh)?

Accepted Answer

Kr\]5s\^1\]4d\^8

Question 2

How many valence electrons do the alkaline earth metals possess?

Accepted Answer

2

Question 3

Place the following elements in order of increasing ionization energy (IE): N, F, As.

Accepted Answer

As \u003c N \u003c F

Question 4

Which of the following is the best Lewis structure for BeF\_2?

Accepted Answer

Be with two single bonds to F, each F with three lone pairs

Question 5

Using the bond energies provided, estimate $$\Delta H_{rxn}$$ for the reaction: $$2Br_2(l) + C_2H_2(g) \rightarrow C_2H_2Br_2(l). $$Given: Br-Br = 193 kJ/mol, C-H = 413 kJ/mol, C≡C = 837 kJ/mol, C-Br = 276 kJ/mol.

Accepted Answer

$$\Delta H_{rxn} = -276 kJ$$

Question 6

Arrange the following molecules in order of increasing central atom electronegativity: PF\_3, OF\_2, SF\_4.

Accepted Answer

PF\_3 \u003c OF\_2 \u003c SF\_4

Question 7

How many of the following molecules are polar? PCl\_3, CO\_2, XeO\_3, SeBr\_2.

Accepted Answer

3

Question 8

Which of the following sets of quantum numbers is NOT allowed?

Accepted Answer

n = 2, l = 1, m\_l = -2

Question 9

Which of the following has the highest lattice energy?

Accepted Answer

MgO

Question 10

Which statement about periodic trends is TRUE?

Accepted Answer

Oxygen has a larger ionization energy than sulfur.

Question 11

Which of the following best defines lattice energy?

Accepted Answer

The energy required to break one mole of a solid ionic compound into its gaseous ions.

Question 12

Which molecule has a linear geometry and is polar?

Accepted Answer

HCN

Question 13

Which of the following is a correct definition of a polar covalent bond?

Accepted Answer

A bond in which electrons are shared unequally between two atoms due to a difference in electronegativity.

Question 14

Which of the following is the correct formula for the kinetic energy of a photon?

Accepted Answer

$$KE = h
u - \phi$$

Question 15

Which of the following is the correct expression for the energy of an electron in the nth energy level of a hydrogen atom?

Accepted Answer

$$E_n = -\frac{2.18 	imes 10$$^{-18}$$ J}{n^2$}$$

Question 16

Which of the following best describes a sigma (\sigma) bond?

Accepted Answer

A bond formed by the head-on overlap of two atomic orbitals along the internuclear axis.

Question 17

Which of the following is the correct formula for the pressure of an ideal gas?

Accepted Answer

$$P = \frac{nRT}{V}$$

Question 18

Which of the following is the correct formula for the energy of a photon?

Accepted Answer

$$E = h
u$$

Question 19

Which of the following is the correct formula for the wavelength of a particle with mass $$m$$ and velocity $$v$$?

Accepted Answer

$$\lambda = \frac{h}{mv}$$

General Chemistry Study Notes: Atomic Structure, Periodic Trends, Chemical Bonding, and Lattice Energy

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