Question 1

Which of the following best describes the difference between ionic and molecular compounds?

Accepted Answer

Ionic compounds are formed by the transfer of electrons between metals and nonmetals, resulting in positive and negative ions, while molecular compounds are formed by the sharing of electrons between nonmetals.

Question 2

What is the correct formula for the ionic compound formed between magnesium and chlorine?

Accepted Answer

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

Question 3

Which of the following ions is a polyatomic ion?

Accepted Answer

$$\mathrm{NH_4$^+}$$

Question 4

A compound contains the ions $$\mathrm{Ca$$^{2+}$$}$$ and $$\mathrm{NO_3$^-}. $$What is its correct chemical formula?

Accepted Answer

$$\mathrm{Ca(NO_3$)_2}$$

Question 5

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

Accepted Answer

They have strong electrostatic attractions between oppositely charged ions.

Question 6

What is the name of the compound $$\mathrm{$$FeCl_3$$}$$, given that iron can form more than one positive ion?

Accepted Answer

Iron(III) chloride

Question 7

Which of the following molecules is nonpolar?

Accepted Answer

$$\mathrm{CO_2$}$$

Question 8

Which type of intermolecular force is present in all substances, but is the only force present in nonpolar molecules?

Accepted Answer

Dispersion forces

Question 9

What is the correct Lewis structure for $$\mathrm{CO_2$}$$?

Accepted Answer

O=C=O, with each O atom having two lone pairs

Question 10

Which of the following pairs of elements is most likely to form a polar covalent bond?

Accepted Answer

H and O

Question 11

What is the shape of a molecule with four electron groups around the central atom, all of which are bonding pairs?

Accepted Answer

Tetrahedral

Question 12

Which of the following compounds contains a metal with a variable charge?

Accepted Answer

$$\mathrm{Fe_2O_3}$$

Question 13

Which of the following molecules would have the highest boiling point due to hydrogen bonding?

Accepted Answer

$$\mathrm{H_2O}$$

Question 14

What is the correct name for the molecular compound $$\mathrm{N_2O_4}$$?

Accepted Answer

Dinitrogen tetraoxide

Question 15

Which of the following statements about electronegativity is correct?

Accepted Answer

Electronegativity increases from left to right across a period.

Question 16

Which of the following best describes the bonding in $$\mathrm{NaCl}$$?

Accepted Answer

Ionic bonds between $$\mathrm{Na^+}$$ and $$\mathrm{Cl^-}$$ ions

Question 17

Which of the following compounds is most likely to be soluble in water due to its polarity?

Accepted Answer

$$\mathrm{NH_3$}$$

Question 18

A molecule of $$\mathrm{NH_3$}$$ has which molecular geometry?

Accepted Answer

Trigonal pyramidal

Question 19

Which of the following is the correct formula for potassium nitride?

Accepted Answer

$$\mathrm{K_3N}$$

Question 20

Which of the following best explains why $$\mathrm{CO_2$} is a $$nonpolar molecule even though it contains polar bonds?

Accepted Answer

The molecule is linear and the dipoles cancel each other out.

Ionic and Molecular Compounds: Structure, Bonding, and Properties

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