2 h Chemical tests Flashcards
What is the test for ammonia gas
Damp red litmus paper
What is the test for Carbon dioxide
Bubble through lime water
What is the test for chlorine gas
Damp blue litmus paper
What is the result for ammonia gas test
Litmus paper turns blue
What is the test for oxygen
Hold a glowing splint
What is the test for hydrogen
Hold a lighted splint in the test tube
What is the result for carbon dioxide gas test
Lime water turns milky
What is the result for chlorine gas test
Litmus paper is bleached
What is the result for hydrogen gas test
The splint burns with a squeaky pop
What is the result for oxygen gas test
The glowing splint relights
Appearance of the test for ammonia gas
Colourless, pungent smell
Appearance of the test for carbon dioxide gas
Colourless, odourless
Appearance of the test for chlorine gas
Pale green, choking smell
Appearance of the test for hydrogen gas
Colourless and odourless
Appearance of the test for oxygen gas
Colourless and odourless
In a flame test, what colour is lithium
Red
In a flame test, what colour is potassium
Lilac
In a flame test, what colour is Calcium
Orange - red
In a flame test, what colour is Copper
Blue - green
In a flame test, what colour is sodium
Yellow
What is the order of the rainbow of the metals flame test
Lithium - red
Calcium - orange - red
Sodium - yellow
Copper - Blue - green
Potassium - Lilac
How to clean a metal wire used for flame test
Dip it in HCL acid, then put in on fire, repeat until no colour
How to test for copper, iron (II) & (III)
-Add sodium hydroxide
-Precipitation reaction
Precipitate of copper hydroxide
Light blue
Precipitate of Iron (II) hydroxide
Green
Precipitate of Iron (III) hydroxide
Brown
How to detect ammonium ions (NH4+)
-Add sodium hydroxide (no precipitate, smell of ammonia)
-Test with damp red litmus paper (turns blue)
How to detect halides
-Add nitric acid
-Add silver nitrate
Precipitate of silver chloride
White
Precipitate of silver bromide
Cream
Precipitate of silver iodide
Yellow
How to detect sulfates
-Add dilute HCL acid
-Add barium chloride
What is the result of detecting sulfates
Barium sulfate, white precipitate
How to detect carbonates
-Add dilute nitric acid
-Fizzing indicates carbon dioxide
-Test for carbon dioxide using lime water
What is the chemical test for water
White anhydrous copper sulfate turns blue
What is the physical test for water / check if its pure
-Check the boiling point
-Should be 100ºC
