science

Question 1

Give one precaution that should be taken when using copper sulfate solution or sodium hydroxide?

Answer 1

wear goggles for eye protection wear gloves for skin protection

Question 2

Describe a test to show that gas is hydrogen

Answer 2

Apply a lighted splint to the gas, there should be squeaky pop sound

Question 3

Describe a test to show that a gas is carbon dioxide

Answer 3

bubble gass through linewater that the water should turn cloudy

Question 4

explain how physical changes are different to chemical changes

Answer 4

physical changes are reversible and do not result in the formation of a new subtances.

Question 5

The process wherein water vapour is cooled to from a liquid is called?

Answer 5

Condensation

Question 6

During distillation, the condenced liquid that is collected at the end is kown as?

Answer 6

Distilate

Question 7

Explain how filter paper separates an insoluble solid for a liquid

Answer 7

Liquid goes through the paper however the solid does not pass thorugh

Question 8

What type of water is potable water?

Answer 8

Tap water

Question 9

Name the three processess used in purifying water for drinking?

Answer 9

Sedimentation, filtration, chlornation

Question 10

In a chromatography experiment done with using water as a solvent and paper, which is the mobile and stationary phase?

Answer 10

Pencil is insoluble in the solvent, chromatography would separate the ink in an ink line.

Question 12

Describe what is meant by convalent bond

Answer 12

A bond formed between a shared pair of electron