03/29/25 - Saturday Tutoring - Solutions

Which of the following best represents the orientation of water molecules toward a Ca2+ ion?

• Oxygen atoms of water molecules point towards the Ca2+ ion

• Hydrogen atoms of water molecules point towards the Ca2+ ion

• Water molecules align randomly around the Ca2+ ion

• Water molecules do not interact with the Ca2+ ion

Which sample of matter is classified as a solution?

• H2O(s)

• H2O(l)

• CO2(g)

• CO2(aq)

Which compound is insoluble in water?

• BaSO₄

• CaCrO₄

• KClO₃

• Na₂S

At STP, which property can be used to differentiate a 2.0-gram sample of NaCl(s) from a 2.0-gram sample of AgCl(s)?

• mass

• solubility

• phase

• temperature

Based on Table G, which compound is less soluble in water as the temperature increases from 0°C to 100°C?

• KNO₃

• NH₃

• KClO₃

• NH₄Cl

What change, other than temperature, would affect the rate of dissolving?

• Pressure

• Color

• Shape

• Weight

Which type of attraction is directly involved when KCl dissolves in water?

• molecule-molecule

• molecule-atom

• molecule-ion

• ion-ion

Which solution is saturated?

• 1

• 2

• 3

• 4

What is the mass of NH4Cl that must dissolve in 200 grams of water at 50.°C to make a saturated solution?

• 26 g

• 42 g

• 84 g

• 104 g

Based on Reference Table F, describe the solubility of zinc sulfide in water.

• Zinc sulfide is soluble in water.

• Zinc sulfide is insoluble in water.

• Zinc sulfide is partially soluble in water.

• Zinc sulfide's solubility in water depends on temperature.