Oxygen And Oxides

Question 1

In dry air it is … % nitrogen

Answer 1

78.1

Question 2

I’m dry air it is … % oxygen

Answer 2

21

Question 3

In dry air it is … % Argon

Answer 3

0.9

Question 4

In dry air it is … % Carbon Dioxide

Answer 4

0.04

Question 5

Show that air is 1/5 oxygen using copper how?

Answer 5

Two gas syringes, containing 200cm of air, which is pushed back and forth over heated copper. Upon cooling, there should be 79cm or air

Question 6

When using copper to show that air is 1/5 oxygen, beware…

Answer 6

Allow the air to cool down

Take the volume of the connecting tubes into account

Question 7

Using the rust ion of Rio to show that air is 1/5 oxygen

Answer 7

Invert a test tube of iron wool into a beaker of water and mark the level of the water. Remark the level in a few days and fill the tube with water to determine what percentage of the air was lost

Question 8

Burning phosphorous to show that air is 1/5 oxygen

Answer 8

Put a bell jar into a beaker of water and touch the phosphorous with a hot metal rod to ignite a reaction with oxygen. Using the same method see how many % the water level rose by

Question 9

Reaction of phosphorous in oxygen

Answer 9

P4 + 5O2 = P4O10

Question 10

Make oxygen in the lab by…

Answer 10

Catalytic decomposition (splitting up using a catalyst) of hydrogen peroxide

Question 11

Equation for catalytic decomposition of hydrogen peroxide

Answer 11

2H2O2(aq) = 2H2O(l) + O2(g)

Question 12

Magnesium reacts with oxygen with a … Flame

Answer 12

Bright white

Question 13

Magnesium reacts with oxygen to produce…

Answer 13

White, powdery magnesium oxide (base)

Question 14

Equation for reaction of magnesium and oxygen?

Answer 14

2Mg(s) + O2(g) = 2MgO(s)

Question 15

Sulphur burns with a … Flame on oxygen

Answer 15

Blue

Question 16

When sulphur burns in oxygen, … Is produced

Answer 16

Poisonous, colourless sulphur dioxide

Question 17

SO2 is a … Oxide

Answer 17

An acidic

Question 18

Equation for reaction between sulphur and oxygen

Answer 18

S(s) + O2(g) = SO2(g)

Question 19

Flame Carbon burns in oxygen with a …

Answer 19

Depending on the purity, a small yellow-orange flame may be produced

Question 20

Carbon burns in oxygen if…

Answer 20

Heated strongly

Question 21

Carbon burns in oxygen to give

Answer 21

Colourless Carbon dioxide

Question 22

Equation for Carbon burning in oxygen?

Answer 22

C(s) + O2(g) = CO2(g)

Question 23

How do you make CO2 in the lab?

Answer 23

The reaction between dilute hydrochloride acid and calcium carbonate in the form of marble chips

Question 24

Equation for reaction of dilute HCL and calcium carbonate

Answer 24

CaCO3(s) + 2HCl(aq) = CaCl2(aq) + CO2(g) + H2O(l)

Question 25

Form Carbon dioxide by thermal decomposition of...

Answer 25

Metal carbonates

Question 26

When heating metal carbonates you get...

Answer 26

Metal Carbonate = Metal Oxide + Carbon Dioxide

Question 27

Some equipment you need to show how CO2 is produce from thermal decomposition

Answer 27

Bunsen Test Tube over bunsen (holding metal carbonate) Delivery Tube into test tube full of limewater Clamp etc

Question 28

How do you test for CO2

Answer 28

It turns limewater cloudy

Question 29

Uses of CO2

Answer 29

``` Fire Extinguishers (when water is not used I.e. Electrical) as it is denser than air. Carbonated drinks at it dissolves in high pressure but when the top is opened the pressure falls and the gas bubbles out of the bottle ```

Question 30

Properties of CO2

Answer 30

Colourless Gas Denser than air Slightly soluble in water

Question 31

When Carbon dioxide reacts with water ... Is produced

Answer 31

Carbonic Acid

Question 32

The reaction of carbon dioxide and water can be reversed by...

Answer 32

Heating or boiling the product

Question 33

Carbonic Acid is what strength

Answer 33

Weak

Question 34

Equation for reaction of Carbon Dioxide and Water?

Answer 34

CO2(aq) + H2O(l) = H+(aq) + HCO3-(aq) This is reversible so the equals sign is reversible

Question 35

Sulphur dioxide reacts with water to form...

Answer 35

Sulphurous Acid

Question 36

Sulphurous Acid is what strength?

Answer 36

Weak

Question 37

Equation for sulphur dioxide reacting with water

Answer 37

H2O(l) + SO2(g) = H2SO3(aq)

Question 38

Acid Rain is caused when...

Answer 38

Oxygen and water in the atmosphere react with sulphur dioxide to produce sulphuric acid (H2SO4) or with various oxides of nitrogen to give nitric acid (HNO3)

Question 39

Sulphur dioxide and various oxides of nitrogen are produced...

Answer 39

Mainly from power stations, burning fossil fuels, motor vehicles, etc

Question 40

Acid rain is damaging in that it...

Answer 40

Kills trees and makes lakes acidic so that they cannot support life. They also 'attack' limestone and some metals such as iron

Question 41

To reduce acid rain we can...

Answer 41

Remove sulphur from fuels, use catalytic converters in cars and 'scrub' the gas from power stations to remove the oxides.

Question 42

Catalytic converters...

Answer 42

Help convert nitrogen oxides into harmless nitrogen gas but they have no effect on sulphur dioxide