5.8 Mid Unit Assessment PS

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

• A. Solute

• B. Solvent

• C. Solution

• D. Supernate

Which of the following is an insoluble substance?

• A. sand

• B. sugar

• C. salt

• D. baking soda

Which of the following statements regarding solutions is NOT correct?

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

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

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

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

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

• A. Stirring the solution.

• B. Crushing the sugar cube.

• C. Heating the solvent.

• D. 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).

• A. C₂H4O2 (sugar)

• B. NaCl (salt)

• C. K₂Cr₂O7 (potassium dichromate)

• D. O2 (oxygen gas)

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

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

• B. Combustion which uses fire to burn the solute.

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

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

A solution which contains all the solute it can hold at a given temperature is called?

• A. saturated

• B. unsaturated

• C. supersaturated

• D. diluted

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

• A. 30g

• B. 20g

• C. 90g

• D. 50g

If 20g of Solute D is added to 100g of water at 50°C, what is the state of the solution?

• A. Supersaturated

• B. Unsaturated

• C. Insoluble

• D. Immiscible

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?

• super saturated

• unsaturated

• insoluble

• immiscible