extras

Question 1

when would you use simple distillation

Answer 1

liquid and soluble solid

Question 2

when would you use fractional distillation

Answer 2

two or more liquids

Question 3

when would you use filtration

Answer 3

undissolved solid from liquid

Question 4

when would you use crystallisation

Answer 4

dissolved solid from liquid

Question 5

when would you use paper chromatography

Answer 5

substances with different solubilities

Question 6

practical: know how to determine the formula of a metal oxide by reduction

Answer 6

• measure boiling tube
• place it horizontally using a clamp
• add copper oxide and reweigh
• pump methane through while heating the copper 11 oxide strongly
• burn the excess gas as it comes out of a hole in the top
• when all the copper oxide has changed colour reweigh