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Chemistry > Oxygen And Oxides > Flashcards

Oxygen And Oxides Flashcards

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1
Q

In dry air it is … % nitrogen

A

78.1

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2
Q

I’m dry air it is … % oxygen

A

21

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3
Q

In dry air it is … % Argon

A

0.9

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4
Q

In dry air it is … % Carbon Dioxide

A

0.04

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5
Q

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

A

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

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6
Q

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

A

Allow the air to cool down

Take the volume of the connecting tubes into account

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7
Q

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

A

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

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8
Q

Burning phosphorous to show that air is 1/5 oxygen

A

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

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9
Q

Reaction of phosphorous in oxygen

A

P4 + 5O2 = P4O10

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10
Q

Make oxygen in the lab by…

A

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

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11
Q

Equation for catalytic decomposition of hydrogen peroxide

A

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

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12
Q

Magnesium reacts with oxygen with a … Flame

A

Bright white

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13
Q

Magnesium reacts with oxygen to produce…

A

White, powdery magnesium oxide (base)

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14
Q

Equation for reaction of magnesium and oxygen?

A

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

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15
Q

Sulphur burns with a … Flame on oxygen

A

Blue

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16
Q

When sulphur burns in oxygen, … Is produced

A

Poisonous, colourless sulphur dioxide

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17
Q

SO2 is a … Oxide

A

An acidic

18
Q

Equation for reaction between sulphur and oxygen

A

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

19
Q

Flame Carbon burns in oxygen with a …

A

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

20
Q

Carbon burns in oxygen if…

A

Heated strongly

21
Q

Carbon burns in oxygen to give

A

Colourless Carbon dioxide

22
Q

Equation for Carbon burning in oxygen?

A

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

23
Q

How do you make CO2 in the lab?

A

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

24
Q

Equation for reaction of dilute HCL and calcium carbonate

A

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

25
Q

Form Carbon dioxide by thermal decomposition of…

A

Metal carbonates

26
Q

When heating metal carbonates you get…

A

Metal Carbonate = Metal Oxide + Carbon Dioxide

27
Q

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

A

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

28
Q

How do you test for CO2

A

It turns limewater cloudy

29
Q

Uses of CO2

A 
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
30
Q

Properties of CO2

A

Colourless Gas
Denser than air
Slightly soluble in water

31
Q

When Carbon dioxide reacts with water … Is produced

A

Carbonic Acid

32
Q

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

A

Heating or boiling the product

33
Q

Carbonic Acid is what strength

A

Weak

34
Q

Equation for reaction of Carbon Dioxide and Water?

A

CO2(aq) + H2O(l) = H+(aq) + HCO3-(aq)

This is reversible so the equals sign is reversible

35
Q

Sulphur dioxide reacts with water to form…

A

Sulphurous Acid

36
Q

Sulphurous Acid is what strength?

A

Weak

37
Q

Equation for sulphur dioxide reacting with water

A

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

38
Q

Acid Rain is caused when…

A

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)

39
Q

Sulphur dioxide and various oxides of nitrogen are produced…

A

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

40
Q

Acid rain is damaging in that it…

A

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

41
Q

To reduce acid rain we can…

A

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

42
Q

Catalytic converters…

A

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

Chemistry (18 decks)

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