Unit 7 Practice Quiz

A substance is classified as an electrolyte because

• it contains covalent bonds

• its aqueous solution has a pH value of 7

• it has a high melting point

• its aqueous solution conducts an electric

  current

Based on Reference Table F, which of these

saturated solutions has the lowest concentration of

dissolved ions?

The attraction between water molecules and an Na+

ion or a Cl– ion occurs because water molecules are

• symmetrical

• Polar

• Nonpolar

• Linear

At standard pressure, which substance becomes

less soluble in water as temperature increases from

10.°C to 80.°C?

(Table G)

• HCl

• KCl

• NaCl

Which compound is insoluble in water?

Which compound is least soluble in water at

60. °C? (Table G)

• NaCl

• 20 grams

• 15 grams

• 5 grams

• 10 grams

• 43 grams

• 86 grams

• 134 grams

• 268 grams

According to Reference Table G, a temperature

change from 10°C to 30°C would have the least

effect on the solubility of