Tests for gases

Question 1

Tests for chlorine

Answer 1

Chlorine bleaches damp litmus paper , turning it white (may turn red for moment because chlorine solution is acidic)

Question 2

Test for oxygen

Answer 2

Put a glowing splint inside a test tube containing oxygen , oxygen will relight the glowing splint. As burning needs oxygen

Question 3

Test for C02

Answer 3

Bubbling c02 through (or shaken carbon dioxide) with a aqueous solution of calcium hydroxide (limewater) causes solution to slowly turn cloudy.

Due to the solid particles forming

Question 4

Test for hydrogen

Answer 4

If you hold a lit splint at the open end of a test tube containing hydrogen you’ll get a squeaky pop noise

noise comes form hydrogen burning quickly with air to form h20.Due to heat energy making the hydrogen react with the oxygen in air