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Year 9 Chemistry > Rections > Flashcards

Rections Flashcards

0
Q

What are the physical properties of oxygen?

A

Colourless
Odourless
Gas

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1
Q

What is the composition of air?

A

Oxygen - 21%
Nitrogen - 78%
Argon - 0.9%
CO2 - 0.37%

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2
Q

What is the word equation for respiration?

A

Sugar + Oxygen -> Carbon Dioxide + Water(+Energy)

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3
Q

What is the chemical test for water?

A

Use the chemical anhydrous copper sulfate which changes colour from white to blue in prescience of water

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4
Q

What is combustion?

A

When a fuel reacts with oxygen to release energy

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5
Q

What are the uses of oxygen?

A

Welding torches
Breathing apparatus in hospitals
Rocket fuel

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6
Q

What is the word equation for the preparation of oxygen?

A

Manganese dioxide

Hydrogen peroxide -> water + oxygen

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7
Q

What chemicals are required for the preparation of oxygen?

A 
Hydrogen peroxide 
Manganese dioxide (catalyst)
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8
Q

What is the test for oxygen?

A

Relights a glowing splint

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9
Q

What is a catalyst?

A

A chemical which speeds up reaction with out being used up itself

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10
Q

What are 3 examples of an industrial catalyst?

A

Iron
Platinum
Vanadium oxide

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11
Q

What are enzymes?

A

Soluble protein molecules that can speed up chemical reactions in cells

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12
Q

What chemical reactions are enzymes involved in?

A

DNA replication
Protein synthesis
Digestion

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13
Q

What are the uses of hydrogen?

A

Making margarine
Clean fuel
Rocket fuel

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14
Q

What is the equation for hydrogen?

A

Magnesium + hydrochloric acid -> magnesium chloride + hydrogen

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15
Q

What chemicals are required in the preparation of hydrogen?

A

Magnesium

Hydrochloric acid

16
Q

What is the test for hydrogen?

A

Using a lighted splint you will hear a squeaky pop

16
Q

What are the uses of carbon dioxide?

A

Fizzy drinks
Fire extinguisher
Dry ice

17
Q

What is the equation for carbon dioxide?

A

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

18
Q

What chemicals are required for the preparation of carbon dioxide?

A

Calcium carbonate

Hydrochloric acid

18
Q

What is the test for carbon dioxide?

A

Turns limewater milky

19
Q

What are two observations when calcium carbonate is added to hydrochloric acid?

A

Bubble of gas

Metal carbonate disappears to give a clear solution

20
Q

What are two physical properties of carbon dioxide?

A

Colourless

Gas

21
Q

What is an exothermic reaction?

A

Gives out heat

22
Q

What is an endothermic reaction?

A

Takes in heat

23
Q

What is oxidation?

A

Occurs when a chemical reacts with oxygen

24
Q

What is reduction?

A

The opposite of oxidation and occurs when a substance looses oxygen

25
Q

What is a redox reaction?

A

When REDUCTION and OXIDATION take place together.

26
Q

What colour is copper?

A

Black

28
Q

What colour is copper oxide?

A

Black

29
Q

What is thermal decomposition?

A

The breaking down of a chemical using heat

30
Q

What is a reducing agent?

A

Substance that reduces another substance

Year 9 Chemistry (2 decks)

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