Question 1

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

Accepted Answer

Ionic compounds are composed of ions held together by ionic bonds, while molecular compounds are composed of molecules held together by covalent bonds.

Question 2

A sodium atom ($$\mathrm{Na}) $$loses one electron to form a sodium ion ($$\mathrm{Na^+}). $$What is the electron arrangement of the resulting ion?

Accepted Answer

$$2,8$$

Question 3

Which of the following ions is a cation?

Accepted Answer

$$\mathrm{Na^+}$$

Question 4

What is the correct formula for the compound formed between aluminum ions ($$\mathrm{Al$$^{3+}$$}) $$and chloride ions ($$\mathrm{Cl^-}$$)?

Accepted Answer

$$\mathrm{$$AlCl_3$$}$$

Question 5

Which of the following compounds contains a polyatomic ion?

Accepted Answer

$$\mathrm{$$CaCO_3$$}$$

Question 6

What is the name of the compound $$\mathrm{Mg(NO_3$)_2}$$?

Accepted Answer

Magnesium nitrate

Question 7

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

Accepted Answer

They are composed of ions held together by strong electrostatic forces.

Question 8

What is the correct name for $$\mathrm{$$FeCl_2$$}$$?

Accepted Answer

Iron(II) chloride

Question 9

Which of the following molecules is nonpolar?

Accepted Answer

$$\mathrm{CO_2$}$$

Question 10

A patient is given a plaster cast made of $$\mathrm{$$CaSO_4$$}. $$Which ions are present in this compound?

Accepted Answer

$$\mathrm{Ca$$^{2+}$$}$$ \, and \, \mathrm{$$SO_4$$^{2-}}$

Question 11

Which of the following is the correct formula for ammonium sulfate?

Accepted Answer

$$\mathrm{(NH_4$)_2SO_4}$$

Question 12

Which of the following best describes the bonding in a molecule of $$\mathrm{H_2O}$$?

Accepted Answer

Covalent bonds with unequal sharing of electrons

Question 13

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

Accepted Answer

Dinitrogen tetroxide

Question 14

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

Accepted Answer

$$\mathrm{$$FeSO_4$$}$$

Question 15

Which of the following is the strongest type of intermolecular force present in $$\mathrm{CH_3OH} ($$methanol)?

Accepted Answer

Hydrogen bonding

Question 16

Which of the following best explains why $$\mathrm{NaCl} is a $$solid at room temperature while $$\mathrm{CO_2$} is a $$gas?

Accepted Answer

$$\mathrm{NaCl}$$ has strong ionic bonds, while $$\mathrm{CO_2$}$$ has weak dispersion forces.

Question 17

What is the correct formula for copper(II) iodide?

Accepted Answer

$$\mathrm{$$CuI_2$$}$$

Question 18

Which of the following best describes the octet rule?

Accepted Answer

Atoms gain, lose, or share electrons to achieve a total of 8 valence electrons.

Question 19

Which of the following is the correct name for $$\mathrm{P_2O_5}$$?

Accepted Answer

Diphosphorus pentoxide

Ionic and Molecular Compounds: Structure, Formation, and Naming

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