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Year 9 Chemistry > Reactions (part 1) > Flashcards

Reactions (part 1) Flashcards

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?

24
Q

Why is hydrochloric acid dangerous?

A

Causes burns

25
What is the evaluation for the test of hydrogen?
The test for hydrogen is using a lighted splint, you will hear a squeaky pop
26
What is the word equation for the preparation of oxygen?
Calcium carbonate + hydrochloric acid -> calcium chloride + water + carbon dioxide
27
What are the chemicals used in the preparation for carbon dioxide?
- hydrochloric acid | - calcium carbonate
28
What is the evaluation for the test for carbon dioxide?
When carbon dioxide is bubbled through limewater it turns milky white
29
Which of the following is less dense than air? - Hydrogen - oxygen - carbon dioxide
Hydrogen - yes Oxygen - no Carbon dioxide - yes
30
Which of the following is used in upward delivery? - Hydrogen - oxygen - carbon dioxide
Hydrogen - yes Oxygen - no Carbon dioxide - no
31
Which of the following is denser than air? - Hydrogen - oxygen - carbon dioxide
Hydrogen - no Oxygen - slightly Carbon dioxide - yes
32
Which of the following is used in downward delivery? - Hydrogen - oxygen - carbon dioxide
Hydrogen - yes Oxygen - yes Carbon dioxide - yes
33
Solubility in water? - Hydrogen - oxygen - carbon dioxide
Hydrogen - very low Oxygen - low Carbon dioxide - low
34
Over water? - Hydrogen - oxygen - carbon dioxide
Hydrogen - yes Oxygen - yes Carbon dioxide - yes
35
Give three uses for carbon dioxide
- fizzy drinks - fire extinguisher - dry ice
36
Give two observations when calcium carbonate is added to hydrochloric acid
- limewater fizzes | - bubbles of gas
37
Give two physical properties of carbon dioxide
- colourless | - odourless
38
What does exothermic mean?
Reaction that gives out heat | E.g. From 18.C to 25.C
39
What does endothermic mean?
Reaction that takes in heat | E.g. from 25.C to 18.C
40
What does oxidation mean?
Addition of oxygen
41
What does reduction mean?
Removal of oxygen
42
What is the definition to a redox reaction?
Reduction and oxidation both taking place in a reaction
43
Write in bold which part of the following equation has been oxidised: Aluminium oxide + potassium -> aluminium + potassium oxide
Aluminium oxide + POTASSIUM -> aluminium + potassium oxide
44
Write in bold which part of the following equation has been reduced: Aluminium oxide + potassium -> aluminium + potassium oxide
ALUMINIUM OXIDE + potassium -> aluminium + potassium oxide
45
What is the colour of copper oxide after it has been heated with carbon?
Black powder
46
What is the colour of carbon after it has been heated with copper oxide?
Black powder
47
What do you see when you heat the mixture of copper oxide and carbon?
- it glows - gas is given off - black copper oxide turns to orange-brown copper
48
What do the contents of the boiling tube look like after heating the mixture of copper oxide and carbon?
Coppery coloured solid produced
49
Write an equation for the reaction when you heat a mixture of copper oxide and carbon
Copper oxide + carbon -> copper + carbon dioxide
50
Why is the reaction of heating a mixture of copper oxide and carbon a redox reaction?
Copper oxide is reduced to copper and carbon is oxidised to carbon dioxide
51
In the thermite reaction (aluminium + iron oxide -> iron + aluminium oxide) the two reactants are...
Iron and aluminium
52
The thermite reaction (aluminium + iron oxide -> iron + aluminium oxide) is a very.....
Exothermic reaction as it gives out lots of heat
53
The reactant ...... Is reduced to .........
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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