$$\frac{10}{100} \times 100 = 10\%$$

$$\frac{0.013}{1000} \times 10^6$ = 13$$ ppm

$$\frac{15}{100} \times 100 = 15\%$$

Question 1

Which of the following best describes an ionic compound?

Accepted Answer

A compound consisting of a metal and a nonmetal, held together by electrostatic attraction between 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

Given the compound MgCl$$_2$$, which type of bond is present?

Accepted Answer

Ionic bond

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

A solution is made by dissolving 10 grams of NaCl in 90 grams of water. What is the percent by mass of NaCl in the solution?

Accepted Answer

$$\frac{10}{100} 	imes 100 = 10\%$$

Question 6

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

Accepted Answer

NaCl (sodium chloride)

Question 7

Which statement correctly describes the difference between an atom and an element?

Accepted Answer

An element is a substance made of only one kind of atom.

Question 8

Which of the following best describes a saturated solution?

Accepted Answer

A solution in which no more solute can be dissolved at a given temperature.

Question 9

If 0.013 grams of manganese are found in 1000 grams of water, what is the concentration of manganese in ppm?

Accepted Answer

$$\frac{0.013}{1000} 	imes 10^6$ = 13$$ ppm

Question 10

Which of the following best describes the process of dissolving sugar in water?

Accepted Answer

The sugar molecules disperse among the water molecules without changing chemically.

Question 11

Which of the following compounds is a covalent compound?

Accepted Answer

H$$_2O$$

Question 12

Which type of element is always listed first in a chemical formula for an ionic compound?

Accepted Answer

Metal

Question 13

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

Accepted Answer

Covalent bonds are weaker than ionic bonds.

Question 14

Which of the following is NOT a property of ionic compounds?

Accepted Answer

Low solubility in water

Question 15

A solution contains 15 grams of MgSO$$_4$$ dissolved in 85 grams of water. What is the percent by mass of MgSO$$_4 in $$the solution?

Accepted Answer

$$\frac{15}{100} 	imes 100 = 15\%$$

Question 16

Which of the following best describes the role of water in a saltwater solution?

Accepted Answer

Water is the solvent.

Question 17

Which of the following would increase the concentration of a salt in a water solution?

Accepted Answer

Evaporating some of the water from the solution.

Question 18

Which of the following is the best example of a chemical change?

Accepted Answer

Burning magnesium ribbon in air.

Question 19

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

Accepted Answer

A compound has a fixed composition, while a mixture can have variable composition.

Question 20

Which of the following best describes the bond formation in NaCl?

Accepted Answer

Sodium transfers an electron to chlorine, forming ions that attract each other.

Ionic vs. Covalent Compounds and Solubility: Study Guide

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