Analysing and Identifying substances Flashcards
(29 cards)
What does a pure substance mean to a chemist?
A pure substance is one that is made up of just one substance. That substance can either be element or compound.
How can you identify a pure substance?
- Boiling Point exactly 100 degrees
- Melting Point exactly 0 degrees
What does a mixture have in terms of melting and boiling points?
A mixture does not have a sharp boiling point or melting point.
What test is used to identify Carbon Dioxide?
Gas through limewater
What will you see in a limewater test if Carbon Dioxide is present?
- The Limewater goes cloudy
- The Limewater bubbles
What test is used to identify oxygen?
A glowing splint test with Hydrogen Peroxide
What will you see in a glowing splint test is Oxygen is present?
The glowing splint will relight with the oxygen
What test is used to identify Hydrogen?
The squeaky pop test
What will you see if Hydrogen is present?
The lit splint (held to the gas) will make a squeaky pop sound.
What test is used to identify if Chlorine?
The blue litmus paper in a circuit test.
What will you see if Chlorine is present?
The damp, blue litmus paper is bleached when held over the positive electrode.
How would you test for Lithium (PI)?
Flame test and you will see a Crimson flame
How would you test for Sodium (PI)?
Flame Test and you will see a yellow flame
How would you test for Potassium (PI)?
Flame Test and you will see a Lilac flame
How would you test for Calcium (PI)?
Flame Test and Brick Red flame
How would you test for Copper (II) (PI)?
Flame test and a Green Flame
How would you test for Aluminium (PI)?
A sodium hydroxide test and a white precipitate which dissolves in excess
How would you test for Calcium (PI)?
A sodium hydroxide test and a white PPT
How would you test for Magnesium (PI)?
A sodium hydroxide test and a white PPT
How would you test for Copper (II) (PI)?
A sodium hydroxide test and a blue PPT
How would you test for Iron (II) (PI)?
A sodium hydroxide test and a green PPT
How would you test for iron (III) (PI)?
A sodium hydroxide test and a red PPT
How would you test for Carbon (NI)?
A carbonates test and the dilute acid will fizz with the limewater going cloudy
How would you test for Chloride (NI)?
A dilute nitric acid and silver nitrate test with a white PPT
