Non Metals

Question 0

What is the test for hydrogen?

Answer 0

Squeaky pops with a lighted splint

Question 1

Name some non metals found in the air

Answer 1

Nitrogen, oxygen, neon, argon, carbon dioxide

Question 2

What is the test for oxygen?

Answer 2

Relights a glowing splint

Question 3

Describe the electrolysis of water?

Answer 3

Water is split into hydrogen and oxygen. Hydrogen is collected to the cathode. Oxygen is collected at the anode. Twice as much hydrogen is formed than oxygen.

Question 4

Write the word and symbol equation for the electrolysis of water?

Answer 4

Water -> Hydrogen + Oxygen

2H_2O -> 2H_2 + O_2

Question 5

Give some advantages of using hydrogen as a fuel

Answer 5

-> Hydrogen is produced from water therefore renewable; water is the only product so does not contribute towards global warming or acid rain.

Question 6

Give some disadvantages of using hydrogen as a fuel

Answer 6

-> Requires large amounts of energy to produce hydrogen from water, forms explosive mixtures with air.

Question 7

We’re the word and symbol equation for the combustion of Hydrogen

Answer 7

Hydrogen + Oxygen -> Water

2H_2 + o_2 -> 2H_2O

Question 8

Burning is exothermic, what does this mean?

Answer 8

Gives out heat

Question 9

What compounds can be found from the sea?

Answer 9

Chlorine, Iodine

Question 10

Why is iodine not extracted from sea water?

Answer 10

It is not economically viable

Question 11

Give some uses and properties of the Noble gases

Answer 11

Helium -> very un reactive used in weather balloons.
Neon -> emits light when electric current passes through- used in advertising signs.
Argon -> very unreactive -used in light bulbs.

Question 12

Give some used of chlorine and iodine

Answer 12

Chlorine -> poisonous/toxic used in treatment for water supplies.
Iodine -> poisonous/toxic used antiseptic before operations

Question 13

Why is chlorination of water accepted?

Answer 13

The abound if choline added to water is controlled and enough is added to kill bacteria without causing harm.

Question 14

What is the fluoridation of water?

Answer 14

Adding fluoride to water

Question 15

Why is fluoridation used?

Answer 15

Prevent tooth decay, reduce number of fillings.

Question 16

How is data collected to prove that fluoride does reduce tooth decay?

Answer 16

Surveying school children of various ages

Question 17

Why does comparing data from one fluoridated area with that from one non-fluoridation area not provide sufficient evidence ?

Answer 17

Other factors such as social and economic backgrounds have an effect

Question 18

Give some arguements for the fluoridation of water

Answer 18

Prevents tooth decay

Question 19

I’ve some disadvantages against the fluoridation of water

Answer 19

• Harmful in high concentrations
• Can cause stomach/bone cancer
• Nobody should be forced to consume fluoride