Unit 3- Further Analysis And Quantitive Chemistry

Question 1

What do flame tests identify?

Answer 1

Metal ions

Question 2

What is the weird way you remember the flame test?

Answer 2

licrimson lik nay car air bag

Question 3

How do you test the metal content of a compound?

Answer 3

Clean coil of wire with acid and boil it, dip into compound and put in flame

Question 4

What do metals form when reacted with sodium hydroxide?

Answer 4

Precipitates:
Calcium2- White
Copper2- blue
Iron2- green
Iron3- brown
Aluminium3- White to colourless
Magnesium2-White

Question 5

How do you test carbonates for CO2?

Answer 5

Bubble carbonate through lime water if it goes cloudy CO2 is present

Question 6

How do you test carbonates for halides?

Answer 6

Add dilute nitric acid to the carbonate, add silver nitrate.
Chloride- White precipitate.
Bromide- cream
Iodide- yellow

Question 7

How do you test carbonates for sulfate ions?

Answer 7

Add dilute HCL, followed by barium chloride solution

White precipitate of barium sulfate means compound was a sulfate

Question 8

If a substance is an ionic compound what will it have?

Answer 8

A positive and negative part