Midunit 5

When sugar is added to tea, the sugar is considered the ___ ?

• solute

• solvent

• solution

Which of the following is an insoluble substance?

• sugar

• salt

• baking soda

• sand

Which of the following statements regarding solutions is NOT correct?

• In covalent solutions water breaks up solute clumps into molecules which float in a distributed manner.

• In ionic solutions water breaks up solute into individual atoms/ions.

• Water being polar, only likes to dissolve other polar substances.

• The properties of gasses and solids prevent them from becoming solutions.

Which of the following would NOT increase the rate a sugar cube dissolves?

• Stirring the solution

• Crushing a sugar cube

• Heating solvent

• Reducing the amount of solvent.

Which of the following substances when dissolved in water does NOT increase in solubility as the temperature increases (to the detriment of aquatic life).

• C2H4O2 (sugar)

• NaCl (salt)

• K2Cr2O7 (potassium dichromate)

• O2 (oxygen gas)

Which of the following scientific techniques is used to separate a solution due to the homogenous nature of the substances involved?

• Chromatography which uses a solvent to carry molecules of different size and speed.

• Combustion which uses fire to burn the solute.

• Filtration which uses filter paper to physically separate parts of a mixture such as sand and salt.

• Spectrometer which measures the concentration of molecules in a substance.

A solution which contains all the

it can hold at a given temperature is called?

• saturated

• unsaturated

• supersaturated

• diluted

In the diagram substance B needs how much solute to reach saturation at 20°C?

• 30g

• 20g

• 90g

• 50g

A solution has reached saturation, the temperature is increased and more solute is added. The temperature is dropped back down. A single seed crystal is added to this solution and a crystal precipitate is formed. What would this type of solution be called?

• supersaturated

• saturated

• unsaturated

• Immiscible

As a solution is diluted the concentration ___?.

• increases

• remains the same

• becomes a darker color

• decreases