Testing for gases

Question 1

What is the test for hydrogen?

Answer 1

zinc + sulphuric acid=zinc sulfate + hydrogen

Question 2

What do you add to produce Hydrogen gas quicker?

Answer 2

Add Crystals of copper sulfate or use magnesium instead of zinc.

Question 3

What is the test for oxygen?

Answer 3

hydrogen peroxide = water+oxygen

with catalyst of manganese oxide

Question 4

How do we detecty oxygen.

Answer 4

Insert a glowing splint in mouth of flask and the oxygen will relight the splint.

Question 5

Name two ways hydrogen can be collected. dew it

Answer 5

1. Collet hydrogen over water

2. Collet hydrogen by upward delivery

Question 6

What is a positive test for hydrogen

Answer 6

A lighted splint makes a pop sound.

The noise comes from the hydrogen burning quickly in the oxygen in the air to form water

Question 7

What is the test for chlorine(toxic gas)

Answer 7

Add concentrated hydrochloric acid(corrosive) to a spatula of moistened potassium manganate crystals in a boiling tube(fume cupboard)
Damp blue litmus paper turns white(bleached by the chlorine