Properties of materials Grade 7 IG

At approximately what temperature does the solubility of sodium chloride, NaCl, match the solubility of potassium dichromate, K₂Cr₂O₇?

• 60 ºC
• 30 ºC
• 50 ºC
• 83 ºC

How many grams of K₂Cr₂O₇, are soluble in 100 g of water at 95 ºC?

• 83 grams
• 75 grams
• 40 grams
• 12 grams

Which substance is MOST soluble at 0 ºC?

• KI
• NaNO₃
• NaCl
• Ce₂(SO₄)₃

When 42 grams of potassium chloride, is dissolved in 100 grams of water at 50 ºC, the solution can be correctly described as:

• supersaturated
• saturated
• unsaturated

Which solute does not increase in solubility as the temurature increases?

• NaCl

• SO₂

• KClO₃

• KNO₃

At what temperature can you fully dissolve 140g of NaNO₃?

• 62

• 73

• 81

• You cannot determine this

You can make a solute dissolve more quickly in a solvent by

• adding more solute.

• adding ice.

• heating the solvent.

• removing some solvent.

Sugar dissolves faster in hot tea compared to iced tea.

What is the factor affecting the rate of solubility in the statement above?

• Rate of stirring

• Temperature

• Size of solute

• Total surface area

What combination would dissolve a solid solute the fastest?

• high temperature, no stirring

• no heat, no stirring

• sugar cube, no heat

• high temperature, stirring

A ___________ is the mixture formed when solutes dissolves in a solvent.

• solution

• solvent

• liquid

• solid