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Year 9 Chemistry > Reactions (part 1) > Flashcards

Reactions (part 1) Flashcards

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1
Q

How much of the air is made up of nitrogen? (Percentage)

A

78%

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2
Q

How much of the air is made up of Argon? (Percentage)

A

0.9%

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3
Q

How much of the air is made up of carbon dioxide? (Percentage)

A

0.037%

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4
Q

Give three physical properties of oxygen

A
  • colourless
  • odourless
  • a gas
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5
Q

List three uses of oxygen

A
  • welding torches
  • rocket fuel
  • breathing apparatus in hospitals
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6
Q

What’s the word equation for respiration?

A

Sugar + oxygen -> carbon dioxide + water + energy

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7
Q

Candle wax is made up of substances containing carbon and hydrogen. Name the 2 products of the reaction when candle wax combusts

A
  • oxides of hydrogen

- carbon

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8
Q

Describe the chemical test for water

A

Presence of water turns anhydrous copper sulfate from white to blue

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9
Q

How much of the air is made up of oxygen? (Percentage)

A

21%

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10
Q

What’s the equation for the preparation of oxygen?

A

Hydrogen peroxide -> water + oxygen

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11
Q

What are the chemicals required for the preparation of oxygen?

A
  • hydrogen peroxide
  • manganese dioxide
  • oxygen
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12
Q

Why is hydrogen peroxide dangerous?

A

Causes serious eye irritation

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13
Q

Why is manganese dioxide dangerous?

A

Harmful by inhalation and if swallowed

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14
Q

What is the test for oxygen evaluation?

A

We proved oxygen has been produced by using a glowing splint which relights

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15
Q

What is a catalyst?

A

Chemical that speeds up reaction without being used up itself

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16
Q

Give two examples of industrial catalysts

A
  • iron

- platnium

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17
Q

What is an enzyme?

A

Soluble protein molecules that speed up chemical reactions in cells

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18
Q

Name some of the chemical reactions that enzymes are involved in (3)

A
  • DNA replication
  • protein synthesis
  • digestion
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19
Q

What is the special ingredient in ‘bio’ or ‘biological’ powders?

A

Catalyst

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20
Q

Why did a shirt not wash at 70.C or be using a cold wash?

A

It wasn’t washed at right temperature - either too hot or too cold

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21
Q

What is the Equation for the preparation of hydrogen?

A

Magnesium + hydrochloric acid -> magnesium chloride + hydrogen

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22
Q

What are the chemicals required for the preparation of hydrogen?

A
  • hydrochloric acid

- magnesium

23
Q

Why is magnesium dangerous?

A

Flammable

24
Q

Why is hydrochloric acid dangerous?

A

Causes burns

25
Q

What is the evaluation for the test of hydrogen?

A

The test for hydrogen is using a lighted splint, you will hear a squeaky pop

26
Q

What is the word equation for the preparation of oxygen?

A

Calcium carbonate + hydrochloric acid -> calcium chloride + water + carbon dioxide

27
Q

What are the chemicals used in the preparation for carbon dioxide?

A
  • hydrochloric acid

- calcium carbonate

28
Q

What is the evaluation for the test for carbon dioxide?

A

When carbon dioxide is bubbled through limewater it turns milky white

29
Q

Which of the following is less dense than air?

  • Hydrogen
  • oxygen
  • carbon dioxide
A

Hydrogen - yes
Oxygen - no
Carbon dioxide - yes

30
Q

Which of the following is used in upward delivery?

  • Hydrogen
  • oxygen
  • carbon dioxide
A

Hydrogen - yes
Oxygen - no
Carbon dioxide - no

31
Q

Which of the following is denser than air?

  • Hydrogen
  • oxygen
  • carbon dioxide
A

Hydrogen - no
Oxygen - slightly
Carbon dioxide - yes

32
Q

Which of the following is used in downward delivery?

  • Hydrogen
  • oxygen
  • carbon dioxide
A

Hydrogen - yes
Oxygen - yes
Carbon dioxide - yes

33
Q

Solubility in water?

  • Hydrogen
  • oxygen
  • carbon dioxide
A

Hydrogen - very low
Oxygen - low
Carbon dioxide - low

34
Q

Over water?

  • Hydrogen
  • oxygen
  • carbon dioxide
A

Hydrogen - yes
Oxygen - yes
Carbon dioxide - yes

35
Q

Give three uses for carbon dioxide

A
  • fizzy drinks
  • fire extinguisher
  • dry ice
36
Q

Give two observations when calcium carbonate is added to hydrochloric acid

A
  • limewater fizzes

- bubbles of gas

37
Q

Give two physical properties of carbon dioxide

A
  • colourless

- odourless

38
Q

What does exothermic mean?

A

Reaction that gives out heat

E.g. From 18.C to 25.C

39
Q

What does endothermic mean?

A

Reaction that takes in heat

E.g. from 25.C to 18.C

40
Q

What does oxidation mean?

A

Addition of oxygen

41
Q

What does reduction mean?

A

Removal of oxygen

42
Q

What is the definition to a redox reaction?

A

Reduction and oxidation both taking place in a reaction

43
Q

Write in bold which part of the following equation has been oxidised:
Aluminium oxide + potassium -> aluminium + potassium oxide

A

Aluminium oxide + POTASSIUM -> aluminium + potassium oxide

44
Q

Write in bold which part of the following equation has been reduced:
Aluminium oxide + potassium -> aluminium + potassium oxide

A

ALUMINIUM OXIDE + potassium -> aluminium + potassium oxide

45
Q

What is the colour of copper oxide after it has been heated with carbon?

A

Black powder

46
Q

What is the colour of carbon after it has been heated with copper oxide?

A

Black powder

47
Q

What do you see when you heat the mixture of copper oxide and carbon?

A
  • it glows
  • gas is given off
  • black copper oxide turns to orange-brown copper
48
Q

What do the contents of the boiling tube look like after heating the mixture of copper oxide and carbon?

A

Coppery coloured solid produced

49
Q

Write an equation for the reaction when you heat a mixture of copper oxide and carbon

A

Copper oxide + carbon -> copper + carbon dioxide

50
Q

Why is the reaction of heating a mixture of copper oxide and carbon a redox reaction?

A

Copper oxide is reduced to copper and carbon is oxidised to carbon dioxide

51
Q

In the thermite reaction (aluminium + iron oxide -> iron + aluminium oxide) the two reactants are…

A

Iron and aluminium

52
Q

The thermite reaction (aluminium + iron oxide -> iron + aluminium oxide) is a very…..

A

Exothermic reaction as it gives out lots of heat

53
Q

The reactant …… Is reduced to ………

A

1 - iron oxide
2 - molten iron

Extra info: this reaction was used to weld train tracks together

Year 9 Chemistry (4 decks)

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