Question 1

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

Accepted Answer

Ionic compounds are formed by the transfer of electrons between a metal and a nonmetal, while molecular compounds are formed by the sharing of electrons between nonmetals.

Question 2

Which of the following is the correct formula for magnesium bromide?

Accepted Answer

$$\mathrm{$$MgBr_2$$}$$

Question 3

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

Accepted Answer

Iron(II) chloride

Question 4

Which of the following ions is the principal cation inside cells and is essential for regulation of body fluids?

Accepted Answer

$$\mathrm{K^+}$$

Question 5

Which of the following compounds contains a polyatomic ion?

Accepted Answer

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

Question 6

What is the correct formula for ammonium sulfate?

Accepted Answer

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

Question 7

Which of the following molecules is nonpolar?

Accepted Answer

$$\mathrm{CO_2$}$$

Question 8

Which intermolecular force is the strongest?

Accepted Answer

Ionic forces

Question 9

What is the correct name for $$\mathrm{Cu_3P}$$?

Accepted Answer

Copper(I) phosphide

Question 10

Which of the following best explains why $$\mathrm{Mg$$^{2+}$$}$$ has a stronger attraction to $$\mathrm{O$$^{2-}$$}$$ than $$\mathrm{Na^+}$$ does to $$\mathrm{Cl^-}$$?

Accepted Answer

Because $$\mathrm{Mg$$^{2+}$$}$$ and $$\mathrm{O$$^{2-}$$}$$ have higher charges, leading to stronger electrostatic attraction.

Question 11

Which of the following is a correct Lewis structure for $$\mathrm{F_2$}$$?

Accepted Answer

Each fluorine atom shares two electrons, forming a single bond, and each has three lone pairs.

Question 12

Which of the following compounds is named correctly?

Accepted Answer

$$\mathrm{K_2S}$$: Potassium sulfide

Question 13

Which of the following molecules would have the highest boiling point?

Accepted Answer

$$\mathrm{NH_3$}$$

Question 14

What is the correct formula for calcium phosphate, a common dietary supplement?

Accepted Answer

$$\mathrm{Ca_3$(PO_4$)_2}$$

Question 15

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.

Question 16

Which of the following is the correct name for $$\mathrm{$$SnCl_2$$}$$?

Accepted Answer

Tin(II) chloride

Question 17

Which of the following is a correct formula for barium sulfate, used in medical imaging?

Accepted Answer

$$\mathrm{$$BaSO_4$$}$$

Question 18

Which of the following best explains why $$\mathrm{Cl_2$} is a $$nonpolar molecule?

Accepted Answer

Because the two chlorine atoms share electrons equally, resulting in no dipole moment.

Question 19

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

Accepted Answer

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

Ionic and Molecular Compounds: Structure, Properties, and Naming

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