Question 1

Which of the following best describes an ionic compound?

Accepted Answer

A compound formed by the transfer of electrons from a metal to a nonmetal, resulting in oppositely charged ions

Question 2

Which of the following is a property of covalent compounds?

Accepted Answer

They generally have low melting and boiling points

Question 3

A student dissolves 10 grams of NaCl in 100 grams of water. Which term best describes NaCl in this solution?

Accepted Answer

Solute

Question 4

Which of the following best explains why ionic compounds conduct electricity when dissolved in water?

Accepted Answer

The ions are free to move and carry charge in solution

Question 5

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

Accepted Answer

$\mathrm{MgCl_2}$

Question 6

Which of the following statements about solutions is TRUE?

Accepted Answer

The solvent is the substance present in the greatest amount

Question 7

A solution is made by dissolving 5 grams of KNO$_3$ in 95 grams of water. What is the percent by mass of KNO$_3$ in the solution?

Accepted Answer

$5\%$

Question 8

Which of the following best describes what happens when sugar dissolves in water?

Accepted Answer

Sugar molecules disperse throughout the water without breaking into ions

Question 9

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

Accepted Answer

$\mathrm{NaCl}$

Question 10

Which of the following best describes the difference between a compound and a mixture?

Accepted Answer

A mixture is made of two or more substances physically combined, while a compound is made of elements chemically combined

Question 11

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

Accepted Answer

Covalent compounds have weaker intermolecular forces than the strong electrostatic forces in ionic compounds

Question 12

A student adds more solute to a saturated solution and observes that the extra solute does not dissolve. What does this indicate about the solution?

Accepted Answer

The solution is already saturated

Question 13

Which of the following best describes the process of dissociation in an ionic compound when it dissolves in water?

Accepted Answer

The ions separate and become surrounded by water molecules

Question 14

Which of the following is the correct order from MOST to LEAST complex: element, atom, compound?

Accepted Answer

Compound, element, atom

Question 15

A solution contains 20 grams of NaCl dissolved in 80 grams of water. What is the percent by mass of NaCl in the solution?

Accepted Answer

$20\%$

Question 16

Which of the following best describes a solvent?

Accepted Answer

The substance present in the greatest amount in a solution

Question 17

Which of the following is a correct statement about the solubility of ionic compounds in water?

Accepted Answer

Most ionic compounds are soluble in water due to the attraction between ions and water molecules

Question 18

Which of the following best describes what happens to the concentration of a solution if more solvent is added?

Accepted Answer

The concentration decreases

Question 19

Which of the following is a real-life example of an ionic compound used in medicine?

Accepted Answer

Sodium chloride (NaCl) used in intravenous saline solutions

Question 20

Which of the following best explains why a solution of NaCl in water conducts electricity, but a solution of sugar in water does not?

Accepted Answer

NaCl dissociates into ions in water, while sugar does not form ions

Ionic vs. Covalent Compounds and Solubility: Study Notes

Study Guide - Practice Questions