Experimental Techniques

• This makes it impossible to calculate Rf values.

• This makes it impossible to use a locating agent.

• This results in a safety hazard caused by solvent fumes.

• This causes the spot nearest the bottom of the paper to catch up with the spot above it.

• A

• B

• C

• D

• A

• B

• C

• D

Mixtures are different than pure substances because mixtures-

• have lower boiling points

• can be separated physically

• are less dense than pure substances

• contain only one type of atom

What is the name of this separation technique?

• Simple distillation

• Fractional distillation

• Boiling

• Evaporation

What is the name of this separation technique?

• distillation

• filtration

• evaporation

• chromatography

Which separation technique is used to obtain salt from seawater?

• Simple distillation

• Filtration

• Chromatography

• Evaporation

Which ink is a mixture?

• Blue

• Red

• Yellow

• Black

Referring to the chromatogram, black ink contains

• Blue, red and yellow ink only

• Blue, red, yellow and green ink

• Blue and yellow ink

• Black ink only

During filtration, the solid that is trapped in the filter paper is called ..A.. and the liquid that has passed through the filter paper is called ..B..

• A: residue B: filtrate

• A: residue B: filterate

• A: filtrate B: residue

• A: filterate B: residue