gas tests and colour changes Flashcards
(9 cards)
1
Q
What is the gas test for hydrogen?
A
Burns with a pop
2
Q
What is the gas test for oxygen?
A
Relights a glowing splint
3
Q
What is the gas test for carbon dioxide?
A
Turns limewater cloudy
4
Q
What is the gas test for ammonia (NH3)?
A
Turns damp red litmus paper blue; strong smell
5
Q
What is the gas test for chlorine?
A
Turns damp blue litmus paper red then bleaches it white
6
Q
What color is red and blue litmus in acid and base?
A
Red in acid, blue in base
7
Q
What is the pH color range for universal indicator?
A
Red–yellow–orange = acid, green = neutral, blue–purple = alkali
8
Q
What color is phenolphthalein in acid and alkali?
A
Colorless in acid, pink in alkali
9
Q
What color is methyl orange in acid and alkali?
A
Red/pink in acid, yellow in alkali
