Chemistry Revision Q4 grade 9

Which of the following substances is a mixture?

• Baking soda

• Gasoline

• Salt

• Sugar

Which is an example of a homogeneous mixture?

• sand

• vegetable soup

• clean air

• fresh-squeezed orange juice

A solution of solids is a(n)___________.

• filtration

• alloy

• pure metal

• heterogeneous mixture

The figure shows the results of paper chromatography of a mixture of

pigments. Based on the results shown, which pigment has the greatest

attraction for the paper?

• A

• B

• C

• D

Which is the type of separation technique being demonstrated in the figure?

• crystallization

• distillation

• filtration

• chromatography

A technique that uses the differences in boiling point to separate homogeneous mixtures is:

• distillation

• chromatography

• filtration

• crystallization

___________ is a separation technique that produces highly pure solids.

• crystallization

• sublimation

• chromatography

• filtration

Which of these is not a homogeneous mixture?

• sugar dissolved in water

• oxygen and nitrogen gases in the air

• oil and vinegar salad dressing

• a silver mercury amalgam used to fill a tooth cavity

Which of the following is a heterogeneous mixture?

• sugar

• sugar in water

• samples of nitrogen and oxygen gases in the same container

• samples of gaseous argon and solid iron in the same container

A technique that uses a porous barrier to separate heterogeneous mixtures is:

• distillation

• chromatography

• filtration

• crystallization