PHYSCI_5.8 Mid Unit Assessment_U5_MU

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

• Solute

• Solvent

• Solution

• Supernate

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 the sugar cube.

• Heating the solvent.

• Reducing the amount of solvent.

Which of the following is an insoluble substance?

• sand

• sugar

• salt

• baking soda

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 solute 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?

• 20g

• 30g

• 50

• 90g

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

• Unsaturated

• Insoluble

• Immiscible

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

• Supersaturated

• Unsaturated

• Insoluble

• Saturated