9. Solutions

Which statement about substances is true?

• A substance cannot be separated from a mixture.

• If two or more substances are physically blended, the new blend is called a compound.

• Substances can be elements or solutions.

• When two or more substances are evenly mixed, we can separate them physically.

Identify the heterogeneous mixture.

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Identify the homogeneous mixture.

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Which statement about solutions and homogeneous mixtures is correct?

• Solutions are liquid, but homogeneous mixtures can be any state of matter.

• Solutions are made up of two elements mixed together, but homogeneous mixtures are made from two compounds mixed together.

• Solutions can only be separated by chemical reactions, but homogeneous mixtures can be separated by physical changes.

• Solutions and homogeneous mixtures are actually the same thing.

Which is the part of a solution that is in the greatest quantity?

• solute

• solvent

• element

• compound

A solution is always the same _____________ as its solvent.

• state of matter

• color

• smell

• texture

What is the concentration of a 0.1 L solution of water with 20 grams of dissolved salt?

• 0.2 g/L

• 2.0 g/L

• 20.0 g/L

• 200.0 g/L

Which of the following solutions is the most diluted?

• A solution of 5 grams of salt with a volume of 100 mL.

• A solution of 10 grams of salt with a volume of 1000 mL.

• A solution of 20 grams of salt with a volume of 1000 mL.

• A solution of 50 grams of salt with a volume of 1000 mL.

Solubility is the ability of a solute to dissolve into a solution. Which of the following statements is true about solubility?

• More solute can dissolve in a solution if its solubility is high.

• More solute can dissolve in a solution if its solubility is low.

• Less solute can dissolve in a solution if its solubility is high.

• The amount of solute that can dissolve depends on the solvent, not solubility.

In which way is solubility different than concentration?

• Unlike concentration, solubility does not depend on the amount solvent.

• Solubility can change based on temperature and pressure, but concentration can only change due to the total volume of solution.

• Solubility is a measurement of how much solute can possibly dissolve, but concentration is a measurement of how much solute is dissolved.

• Unlike concentration, solubility depends on the amount of solute dissolved in the total solution.