C8 - Chemical Analysis

Question 1

How do we test for chlorine?

Answer 1

Chlorine bleaches the damp litmus paper turning it white

Question 2

How do we test for oxygen?

Answer 2

Put glowing splint inside a test tube,the oxygen will relight the glowing splint

Question 3

How do we test for carbon dioxide?

Answer 3

Bubble carbon dioxide through an aqueous solution of limewater causing the solution to turn cloudy

Question 4

How do we test for hydrogen?

Answer 4

Hold lit splint at the open end of a test tube containing hydrogen, you’ll get a “squeaky pop”

Question 5

Chromatography practical

Answer 5

• Use a ruler to draw a pencil line horizontally on the paper
• Line should be around 2cm from the bottom of the paper
• Mark 5 pencil spots at equal spaces across the line
• Use a capillary tube to put small spots on each food colours unknown/known onto the pencil spots
• Pour water into a beaker to a depth of a cm
• attach paper to a glass rod using tape and then lower the paper into the beaker
• put lid on beaker to reduce evaporation of the solvent
• water will move up paper and colours will be carried up
• remove paper from beaker when water has travelled three-quarters up
• use pencil line to mark the point where the water has reached

Question 6

What % of the atmosphere is?

Answer 6

-78% nitrogen
-21% oxygen
- 0.9% argon
- 0.1% other gases