Year 8 Science Concentration and Chromatography

What does the concentration of a solution indicate?

• A) The weight of the solvent

• B) The amount of solute dissolved in the solvent

• C) The colour of the solution

• D) The temperature of the solvent

Which of the following statements about concentration is true?

• A) High concentration means a large volume of solvent

• B) Low concentration means a large volume of solute

• C) Low concentration means few particles of solute in the solvent

• D) High concentration means few particles of solvent in the solute

What is paper chromatography used for?

• A) To measure the concentration of a solution

• B) To separate and identify substances in a mixture

• C) To determine the temperature of a solution

• D) To analyse the pH of a solution

How does paper chromatography work?

• A) By boiling the mixture to separate its components

• B) By passing the mixture through a filter

• C) By allowing the components of the mixture to travel up a strip of paper at different rates

• D) By mixing the components with a solvent to form a solution

What determines how far each component of a mixture travels on the paper in chromatography?

• A) The temperature of the solvent

• B) The size of the paper strip

• C) The chemical properties of the components

• D) The polarity of the components and the solvent

How does increasing the concentration of a solution affect its properties?

• A) It decreases its boiling point

• B) It increases its freezing point

• C) It reduces its viscosity

• D) It makes it less reactive