Question 1

Which of the following ions is a common polyatomic ion?

Accepted Answer

SO$$_4$$^{2-}$$

Question 2

A compound is named potassium nitrate. What is its correct chemical formula?

Accepted Answer

$$\mathrm{$$KNO_3$$}$$

Question 3

Which statement best explains why ionic compounds tend to have high melting points?

Accepted Answer

They are held together by strong electrostatic forces between oppositely charged ions.

Question 4

Given the element magnesium (Mg), which ion does it most commonly form?

Accepted Answer

$$\mathrm{Mg$$^{2+}$$}$$

Question 5

Which of the following is a binary covalent compound?

Accepted Answer

$$\mathrm{CO_2$}$$

Question 6

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

Accepted Answer

O atom with two single bonds to H atoms and two lone pairs on O

Question 7

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

Accepted Answer

Hydrogen bonding

Question 8

Which of the following molecules is nonpolar despite having polar bonds?

Accepted Answer

$$\mathrm{CO_2$}$$

Question 9

Using the VSEPR theory, what is the molecular shape of methane ($$\mathrm{CH_4$}$$)?

Accepted Answer

Tetrahedral

Question 10

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

Accepted Answer

Ionic compounds transfer electrons, covalent compounds share electrons.

Question 11

Which of the following elements has the highest electronegativity?

Accepted Answer

Fluorine

Question 12

A student mixes sodium chloride ($$\mathrm{NaCl}) in $$water. Which type of solid is $$\mathrm{NaCl}$$ before dissolving?

Accepted Answer

Ionic solid

Question 13

Which intermolecular force is present in all molecules, regardless of polarity?

Accepted Answer

London dispersion forces

Question 14

Which of the following compounds contains a transition metal cation?

Accepted Answer

$$\mathrm{$$FeCl_3$$}$$

Question 15

Which property is most affected by intermolecular forces in a covalent compound?

Accepted Answer

Boiling point

Question 16

What is the formula for calcium phosphate, given that calcium forms $$\mathrm{Ca$$^{2+}$$}$$ and phosphate is $$\mathrm{PO_4$^{3-}}$$?

Accepted Answer

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

Question 17

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

Question 18

Which compound is most likely to exhibit hydrogen bonding?

Accepted Answer

$$\mathrm{NH_3$}$$

Question 19

A patient is given a medication containing ammonium sulfate. What is the formula for ammonium sulfate?

Accepted Answer

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

Question 20

Which of the following statements about covalent compounds is true?

Accepted Answer

They are formed by sharing electrons between atoms.

Study Guide: Ionic and Covalent Compounds in GOB Chemistry

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