Question 1

Which of the following ions is isoelectronic with Ne?

Accepted Answer

Na+

Question 2

Which element below has the highest first ionization energy?

Accepted Answer

Ne

Question 3

Which of the following statements about atomic radii is correct?

Accepted Answer

Atomic radius decreases across a period from left to right.

Question 4

Which of the following ions has the largest ionic radius?

Accepted Answer

O2-

Question 5

Which of the following elements is paramagnetic?

Accepted Answer

O

Question 6

What is the formal charge on the central atom in the best Lewis structure for ICl5?

Accepted Answer

$$0$$

Question 7

Which of the following reactions represents the electron affinity of chlorine?

Accepted Answer

Cl(g) + e^- \rightarrow Cl^-(g)

Question 8

Which compound below has the highest lattice energy?

Accepted Answer

MgO

Question 9

Which bond is the shortest?

Accepted Answer

Triple covalent bond

Question 10

What is the definition of electronegativity?

Accepted Answer

The ability of an atom to attract electrons to itself in a chemical bond

Question 11

How many valence electrons are present in IF5?

Accepted Answer

$$44$$

Question 12

Which of the following describes a resonance structure of the carbonate ion, $$CO_3$$^{2-}$$?

Accepted Answer

The $$CO_3$$^{2-}$$ ion contains three C—O bonds, each with bond order between single and double, due to resonance.

Question 13

Estimate $$\Delta H^\circ_{rxn}$$ for the reaction $$2 Br_2$ (l) + C_2H_2 (g) \rightarrow C_2H_2Br_4 (l)$$ using the following bond energies: Br-Br $$193 kJ/$$mol, C≡C $$837 kJ/$$mol, C-C $$347 kJ/$$mol, C-Br $$276 kJ/$$mol, C-H $$414 kJ/$$mol.

Accepted Answer

$$-324 kJ$$

Question 14

Which bond below is the most polar?

Accepted Answer

H-F

Question 15

What is the formal charge on the F atom in the best Lewis structure for XeF4?

Accepted Answer

$$0$$

Question 16

What is the molecular geometry and number of electron groups for BrF3?

Accepted Answer

T-shaped, 5 electron groups

Question 17

How many electron groups are around a molecule with $$sp^2$$ hybridization?

Accepted Answer

$$3$$

Question 18

What is the approximate bond angle for a molecule with a trigonal planar shape?

Accepted Answer

$$120^\circ$$

Question 19

What is the molecular geometry of SCl4?

Accepted Answer

Seesaw

Question 20

Which compound below contains at least one polar covalent bond, but is nonpolar overall?

Accepted Answer

CCl4

General Chemistry Study Guide: Periodic Properties, Bonding, and Molecular Structure

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