Chapter 3 - Earth’s Resources and Testing Gases

Question 1

How do you test for Hydrogen

Answer 1

• place zinc and hydrochloric acid in a canicular tube
• bung with delivery tube into a water tray
• the delivery tube exits into an upside down test tube
• the reaction between zinc and hydrochloric acid forms hydrogen gas
• hydrogen is collected in the upside down test tube
• light a splint and then place it in the test tube
• positive test = splint pops when placed in test tube

Question 2

How do you test for oxygen

Answer 2

• zinc + dilute hydrochloric acid in a canicular tube
• boiling tube placed over the entrance of tube
• this collects the gas
• light and then blow out a splint
• immediately, place the splint in the boiling tube
• positive test = splint relights

Question 3

How do you test for carbon dioxide

Answer 3

• marble chips + dilute hydrochloric acid in test tube
• delivery tube into a test tube with limewater
• positive result = limewater turns cloudy

Question 4

How do you test for different positive ions (flame test) (5)

Answer 4

Lithium - crimson 
Sodium - yellow 
Calcium - red/orange 
Copper - green 
Potassium - lilac

Question 5

How do you test for negative Carbonate ions

Answer 5

If you add dilute acid to a carbonate, it will fizz, producing carbon dioxide, the delivery tube is ends in a limewater test tube. If the result is positive, the limewater will go cloudy

Question 6

How do you test for halide negative ions

Answer 6

Chlorine + dilute nitric acid + silver nitrate —> white
Bromine + dilute nitric acid + silver nitrate —> cream
Iodine + dilute nitric acid + silver nitrate —> yellow

Question 7

What is a pure substance

Answer 7

A substance which only contains one element

Question 8

What is the formula for the retention factor

Answer 8

Distance moved by substance
_________________________
Distance moved by solvent

Question 9

How do you identify a pure substance

Answer 9

By the temperature they boil at. If the solution boils at its predicted temperature, it means it is pure

Question 10

What is a finite resource

Answer 10

A resource that will eventually run out

Question 11

What are 3 examples of finite resources

Answer 11

1. Metal ores
2. Crude oils
3. Limestone

Question 12

What is a renewable resource

Answer 12

A resource that generate energy from natural resources and is unlimited