Gases in the Atmosphere

Question 1

What is the percentage of Nitrogen in the air

Answer 1

78%

*Only applies to dry unpolluted air

Question 2

What is the percentage of Oxygen in the air

Answer 2

21%

*Only applies to dry unpolluted air

Question 3

What is the percentage of Argon in the air

Answer 3

0. 9%

* Only applies to dry unpolluted air

Question 4

What is the percentage of Carbon Dioxide in the air

Answer 4

0. 04%

* Only applies to dry unpolluted air

Question 5

What is the experiment used to show that oxygen is present in the air

Answer 5

The copper experiment

The rusting of iron

Question 6

Does Phosphorus react with Water

Answer 6

No

Question 7

Why does there always need to be an excess of the reactant when finding the composition of oxygen in the air

Answer 7

To make sure that all of the oxygen has reacted.

Question 8

What are the observations when Magnesium Burns in air

Answer 8

• Bright white flame is produced.

- Product formed is white in color.

Question 9

How do you Test For Hydrogen

Answer 9

By Directing a light splint towards the substance and then if it goes out with a squeaky pop, then it contains Hydrogen.

Question 10

What are some properties of Metal Oxides

Answer 10

• They form Ionic Compounds
• They are usually insoluble in water. But the ones that are soluble in water form an alkaline solution with OH- ions.
• They are usually alkaline, which means that they react with acids to form salts.

Question 11

What are some properties of Non-Metal Oxides

Answer 11

• They are covalent compounds
• They are acidic oxides and react with alkalis/bases to form salts.
• They are often soluble in water and react with it to form an acidic solution containing H+ ions

Question 12

What is the color of the flame when Sulfur burns in Oxygen

Answer 12

Blue

Question 13

What is the color of the sulfur dioxide produced

Answer 13

Colorless

Question 14

Why is sulfur dioxide dangerous to humans when they inhale it

Answer 14

It is poisonous.

Question 15

What is the physical state of sulfur dioxide at room temperature

Answer 15

Gas

Question 16

What is the color of the flame when hydrogen burns int the air

Answer 16

Blue

Question 17

What is the product when hydrogen burns in the air

Answer 17

Water

Question 18

What is the product when sulfur burns in the air

Answer 18

Sulfur dioxide

Question 19

What is the product when magnesium burns in the air

Answer 19

Magnesium Oxide.

Question 20

What are the 2 ways that can be used to produce carbon dioxide.

Answer 20

By reacting calcium Carbonate with dilute hydrochloric acid.

Carbon Dioxide can also be made by heating metal carbonates so that they split to give a metal oxide and carbon dioxide

Question 21

What does copper carbonate look like

Answer 21

Green Powder

Question 22

What does copper oxide look like

Answer 22

Black powder

Question 23

What is a Hydrocarbon

Answer 23

This is a molecule that contains hydrogen and carbon atoms only.

Question 24

How can Carbon Dioxide be formed by the thermal decomposition of Copper Carbonate

Answer 24

When copper carbonate is heated. It will breakdown through the process of thermal decomposition to produce copper oxide and carbon dioxide.

Question 25

What are the greenhouse gases

Answer 25

1. Carbon Dioxide
2. Methane
3. Nitrous oxide
4. CFC

Question 26

How does the greenhouse effect occur

Answer 26

When high energy UV radiation comes from the sun towards the earth through the atmosphere, it heats up the surface of the earth. This means that the Earth will also radiate the heat as IR radiation. This thermal energy then heats up carbon dioxide molecules that then give out heat energy in all directions, which warms up the atmosphere.

Question 27

What are some of the effects of climate change

Answer 27

1. Polar ice caps melting
2. Increase the seawater level.
3. More extreme natural disasters