4.6.1 - Gas Tests

Question 1

What is the chemical test for hydrogen!?

Answer 1

. Squeaky pop test
Method:
1.Collect a sample of gas in a test tube
2.Attempt to ignite the gas using a lit splint
3.If hydrogen is present then squeaky pop sound is made

Question 2

What is the chemical test for oxygen!?

Answer 2

Glowing splint test
Method:
1. Collect sample of gas in a test tube
2. Place glowing splint into the tube
3. If oxygen is present the splint relights

Question 3

What is the chemical test for water!?

Answer 3

Copper sulphate test
Method:
1. Add anhydrous copper sulphate
2. If colour changes from white to blue then water is present

Question 4

What is the test for the purity ofwater!?

Answer 4

Comparing its boiling point to 100•C
Method:
1. Measure it’s boiling point
2. Closer to 100•C= more pure

Question 5

What is the chemical test for carbon dioxide!?

Answer 5

Limewater test
Method:
1. Bubble a sample of gas through limewater
2. If carbon dioxide is present a white precipitate forms (turns cloudy)

Question 6

What is the chemical test for chlorine!?

Answer 6

Damp blue litmus test
Method:
1. Place damp blue litmus paper in a sample of gas
2. If chlorine is present damp blue litmus paper turns white

Question 7

What is the chemical test for ammonia!?

Answer 7

Damp red litmus test
Method:
1. Place damp red litmus paper in a sample of gas
2. Of ammonia is present it turns blue