1. Filtering

2. Filtering
What is filtering?
What can we filter?
What is filter paper?

3. The equipment
funnel
filter paper
test tube
filtrate
residue

4. Teacher tea calamity
You are Nancy Cyanide, lab technician at the Professor Hawkins school. One of the chemistry teachers, Mrs Bunsen, is in a bad mood because she dropped her chalk in her cup of tea. The kettle in the prep room takes a long time to boil so you haven’t got time to make a fresh cup. Can you draw on your knowledge of chemistry separation techniques and get the chalk out of Mrs Bunsen’s tea?

5. Filtering rock salt
You are Nigel Singh and you are a trainee technician at Boots. You need some sodium chloride for an experiment but the only salt left in store is rock salt. Rock salt has lots of salt in it mixed up with dirt and sand. How can you remove the dirt from the sample and obtain a clean sample of salt to use in your experiment?

6. Experiment 1
Experiment 2
filtrate
residue
filtrate
residue

7. How does filter paper work?
filtrate
residue
mixture
holes
pass through
stopped
liquid
solid
solution
separate
soluble
insoluble
test tube
stand