H.Chem: 20% Formative: Solutions

CHECK BOX ALL of the following that would increase the rate of dissolving a solute in water?

• raising temperature of water

• stirring the solution

• grinding the solid to smaller particles

• using larger chunks of the solid

Which of the following will dissolve most rapidly?

• sugar cubes in cold water

• sugar cubes in hot water

• powdered sugar in cold water

• powdered sugar in hot water

If the amount of solute present in a solution at a given temperature is less than the maximum amount that can dissolve at that temperature, the solution is said to be

• saturated.

• unsaturated.

• supersaturated.

• concentrated.

As temperature increases, solubility of solids in liquids

• doesn’t make a difference.

• always decreases.

• usually increases.

• usually decreases.

Which of the following best defines a solution?

• A heterogeneous mixture of two or more substances

• A homogeneous mixture composed of a solute and a solvent

• A mixture where particles settle out over time

• A compound formed by a chemical reaction between two liquids

How would you change a saturated solution into an unsaturated solution?

• add more solute

• add more solvent

• stir it

• shake it

Using a solubility curve graph, determine the solubility each of the following. 55g of NH3 at 20°C

• unsaturated

• saturated

• concentrated

• supersaturated

Using a solubility curve graph, determine the solubility each of the following. 60g of KNO3 at 50°C

• unsaturated

• saturated

• concentrated

• supersaturated

What is the solubility of KNO₃ in 100 grams of water at 40⁰C?

• 65 g

• 55 g

• 45 g

• 75 g

Which compound is the MOST SOLUBLE at 20⁰C? (Hint: only put the symbol in your answer)