Question 1

Which of the following best explains why ionic compounds tend to have high melting points?

Accepted Answer

Because the ions are held together by strong electrostatic forces in a lattice structure.

Question 2

Given the compound magnesium chloride, what is its correct chemical formula?

Accepted Answer

$$\mathrm{$$MgCl_2$$}$$

Question 3

Which of the following ions is a polyatomic ion?

Accepted Answer

$$\mathrm{SO_4$^{2-}}$$

Question 4

What is the correct name for the compound $$\mathrm{$$FeCl_3$$}$$?

Accepted Answer

Iron(III) chloride

Question 5

Which of the following best describes a covalent bond?

Accepted Answer

A bond formed by the sharing of electrons between two nonmetal atoms.

Question 6

Which of the following molecules is nonpolar, based on its molecular geometry?

Accepted Answer

$$\mathrm{CO_2$}$$

Question 7

What is the correct Lewis structure for water ($$\mathrm{H_2O}$$)?

Accepted Answer

Oxygen in the center with two single bonds to hydrogen and two lone pairs on oxygen.

Question 8

Which of the following best predicts the shape of methane ($$\mathrm{CH_4$}) $$using VSEPR theory?

Accepted Answer

Tetrahedral

Question 9

Which of the following pairs of atoms would form a polar covalent bond?

Accepted Answer

$$\mathrm{H}$$ and $$\mathrm{F}$$

Question 10

Which intermolecular force is primarily responsible for the high boiling point of water?

Accepted Answer

Hydrogen bonding

Question 11

A sample of sodium chloride ($$\mathrm{NaCl}) is $$dissolved in water. Which type of solid is $$\mathrm{NaCl}$$ before dissolving, and what force holds it together?

Accepted Answer

Ionic solid; electrostatic attraction between ions

Question 12

Which of the following statements about London dispersion forces is correct?

Accepted Answer

They are present in all molecules, but are the only intermolecular force in nonpolar molecules.

Question 13

Which of the following best describes the trend in electronegativity across a period in the periodic table?

Accepted Answer

Electronegativity increases from left to right across a period.

Question 14

Which of the following compounds contains both ionic and covalent bonds?

Accepted Answer

$$\mathrm{$$NaNO_3$$}$$

Question 15

Which of the following best explains why oil and water do not mix?

Accepted Answer

Oil is nonpolar and water is polar, so there are no favorable interactions between them.

Question 16

Which of the following is the correct formula for the compound formed between aluminum and sulfate?

Accepted Answer

$$\mathrm{Al_2$(SO_4$)_3}$$

Question 17

Which of the following best describes the difference between a molecular solid and an ionic solid?

Accepted Answer

Molecular solids are held together by intermolecular forces, while ionic solids are held together by electrostatic attractions between ions.

Question 18

Which of the following is a correct prediction for the charge of a main group ion based on its position in the periodic table?

Accepted Answer

Elements in Group 1 form $$+1$$ ions.

Question 19

Which of the following best explains why covalent compounds generally have lower melting points than ionic compounds?

Accepted Answer

Covalent compounds are held together by weaker intermolecular forces compared to the strong ionic bonds in ionic compounds.

Question 20

Which of the following best describes a dipole-dipole interaction?

Accepted Answer

An attraction between the positive end of one polar molecule and the negative end of another polar molecule.

Study Guide: Ionic and Covalent Compounds in GOB Chemistry

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