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Year 9 Chemistry > Reaction > Flashcards

Reaction Flashcards

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1
Q

What percentage is oxygen in the air

A

21%

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2
Q

What % is nitrogen in the air

A

78%

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3
Q

What % is argon in air

A

0.9%

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4
Q

What % is carbon dioxide in the air?

A

0.037

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5
Q

3 properties of oxygen

A

Colourless
Odourless
Gas
Not very soluble in water
Same density as air
Slightly denser than water
melting point of -219°C and a boiling point of -183°C

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6
Q

3 uses of oxygen

A

Wielding torches
Rocket fuel
Breathing apparatus in hospitals

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7
Q

Word equation for respiration

A

Sugar + oxygen = carbon dioxide + water (+energy)

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8
Q

Chemical test for water?

A

Use the chemical anhydrous copper sulfate which changes colour from white + blue in presence of water

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9
Q

Equation for preparation of oxygen

A

Manganese dioxide

Hydrogen peroxide = Water + oxygen

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10
Q

Test for oxygen

A

Relights with a glowing splint

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11
Q

What’s a catalyst

A

It’s a chemical that speeds up a chemical reaction without being used up itself

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12
Q

3 examples of industrial catalysts

A

Vanadium (V) oxide
Platinum
Iron

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13
Q

Equation for preparation of hydrogen

A

Magnesium + hydrochloric acid = magnesium chloride + hydrogen

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14
Q

What are the chemicals required for oxygen?

A

Hydrogen peroxide
Catalyst manganese dioxide

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15
Q

What are the chemical required for hydrogen

A

Hydrochloric acid
Magnesium ribbon

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16
Q

Test for hydrogen

A

Worth a lighted splint and you’ll hear a squeaky sound

17
Q

Air is a mixture of what gases?

A

Oxygen, nitrogen, argon, water vapour and noble gases

18
Q

Properties of carbon dioxide

A

It is a colourless and odourless gas.

It is denser than air.

It has a melting point of -56C and has a boiling point of -79C.

19
Q

Properties of nitrogen

A

colorless, odorless, and tasteless gas.

It is a non-poisonous gas

melting point –210°C; boiling point –196°C;

20
Q

Uses for hydrogen

A

Making margarine
Rocket fuel
Clean fuel

21
Q

Uses for carbon dioxide

A

Fizzy drinks
Dry ice
Fire extinguishers

22
Q

Endothermic reactions

A

A reaction that takes in heat

23
Q

Exothermic reactions

A

Gives out heat

24
Q

Examples of endothermic reactions

A

Melting ice cubes
Evaporating liquid
Splitting gas molecules

25
Q

Exothermic reactions examples

A

Rusting of iron
Lighting a match
Fireworks display
Starting a gas oven

26
Q

Oxidation

A

Addition of oxygen

27
Q

Reduction

A

Removal of oxygen

28
Q

Redox reaction

A

Reduction and oxidation both taking place

Year 9 Chemistry (3 decks)

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