Topic 8 Higher

Question 1

What color do lithium ions produce under a flame?

Answer 1

Crimson

Question 2

What color do sodium ions produce under a flame?

Answer 2

Yellow

Question 3

What color do potassium ions produce under a flame?

Answer 3

Lilac

Question 4

What color do calcium ions produce under a flame?

Answer 4

Orange-red

Question 5

What color do copper ions produce under a flame?

Answer 5

Green flame

Question 6

Why can a flame test not be used for a sample containing a mixture of metal ions?

Answer 6

There will be more than one flame color mixing meaning the colors may be masked

Question 7

What ions form white compound when reacted with a sodium hydroxide solution?

Answer 7

Aluminum, calcium, magnesium

Question 8

What is the color of the compound produced when copper ions and added to sodium hydroxide?

Answer 8

Blue

Question 9

What is the color of the compound produced when iron (2+) ions and added to sodium hydroxide?

Answer 9

Green

Question 10

What is the color of the compound produced when iron (3+) ions and added to sodium hydroxide?

Answer 10

Brown

Question 11

What is the test for carbonates?

Answer 11

• add to an acid
• run the gas produced through lime water
• if a carbonate is present the lime water will turn cloudy (due to CO2)

Question 12

what is the test for halides?

Answer 12

Add silver nitrate solution in the present of dilute nitric acid.

Question 13

What color is silver chloride?

Answer 13

White

Question 14

What color is silver bromide?

Answer 14

Cream

Question 15

What color is silver iodide?

Answer 15

Yellow

Question 16

What is the test for sulfates?

Answer 16

• add to barium chloride in the presence of HCl
• a white precipitate will be produced

Question 17

Explain how to do flame test emissions spectroscopy.

Answer 17

• the sample is put into a flame
• the light produced is passed through a spectroscope
• a line spectrum is produced that can be analyzed