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Year 9 Chemistry > Topic 2 reactions > Flashcards

Topic 2 reactions Flashcards

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1
Q

What percentage of air is made up of oxygen

A

About 21%

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2
Q

Give 2 properties of oxygen

A

Colourless
Odourless

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3
Q

Name 2 uses of oxygen

A

Welding torches
Rocket fuel
Breathing apparatus in hospitals

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4
Q

A reaction that uses oxygen is know as what type of reaction

A

An oxidation reaction

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5
Q

Respiration uses oxygen and sugar and happens in our bodies - what is the equation

A

Sugar + oxygen —————> water + carbon dioxide + energy

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6
Q

Rusting is an example of what type of reaction

A

Oxidation

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7
Q

What is the word equation for rusting

A

Iron + oxygen + water —————> hydrated iron oxide

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8
Q

Burning a fuel requires oxygen. What is the word equation

A

Fuel + oxygen———> carbon dioxide + water + energy

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9
Q

What is another name for burning

A

Combustion

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10
Q

What is the test for carbon dioxide

A

Turns limewater milky

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11
Q

What is the test for water

A

Turns anhydrous copper sulfate from white to blue

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12
Q

Hydrogen peroxide can be broken down to two products - what are they?

A

Water and oxygen

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13
Q

What is added to speed up the break down of hydrogen peroxide

A

A catalyst (manganese dioxide)

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14
Q

What is the test for oxygen

A

Relights a glowing splint

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15
Q

What is a catalyst

A

A substance that speeds up a reaction but is not used up in the reaction

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16
Q

Give an example of a biological catalyst

A

Enzymes eg protease, amylase, lipase

17
Q

Give 2 properties of hydrogen

A

Colourless
Odourless
Gas

18
Q

Give 2 uses of hydrogen

A

Making margarine
As a clean fuel e.g some buses are hydrogen fuelled
As rocket fuel

19
Q

What happens when magnesium is added to hydrochloric acid

A

It bubbles
Is exothermic reaction
Gives of hydrogen gas

20
Q

How can you test for hydrogen

A

Add a lighted splint and it burns with a squeaky pop

21
Q

What is the word equation for reaction between hydrochloric acid and magnesium

A

Magnesium + hydrochloric acid ————-> magnesium chloride + hydrogen

22
Q

What gas is now used in air ships after the hindenburg disaster

A

Helium

23
Q

Give 2 properties of carbon dioxide

A

Odourless
Colourless
Gas

24
Q

Give 2 uses of carbon dioxide

A

Fizzy drinks
Fire extinguisher
Dry ice

25
Q

Carbon dioxide can be made by adding calcium carbonate to hydrochloric acid. What is the word equation for this reaction

A

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

26
Q

How do you test for carbon dioxide

A

Turns limewater milky

27
Q

What is meant by an endothermic reaction

A

A reaction that takes in heat - the temperature will go down

28
Q

What is meant by an exothermic reaction

A

Gives out heat - the temperature will increase

29
Q

What is meant by thermal decomposition

A

Using heat to break down a substance

30
Q

Copper carbonate can be broken down by thermal decomposition. What is the colour change that happens

A

From green to black

31
Q

What is the black substance produced during the thermal decomposition of copper carbonated

A

Copper oxide

32
Q

What gas is produced by thermal decomposition of copper carbonate

A

Carbon dioxide is produced

33
Q

What is a reduction reaction

A

When oxygen is removed

34
Q

What is a redox reaction

A

When one substance is oxidised and another substance in the reaction is reduced

35
Q

In the redox reaction between sodium and magnesium oxide which substance is reduced?

A

Magnesium oxide has oxygen removed (reduced) to form magnesium

36
Q

In the redox reaction between magnesium oxide and sodium what are the products and state which is oxidised and which is reduced

A

Magnesium oxide + Sodium ————> magnesium + sodium oxide
Magnesium oxide reduced
Sodium oxidised - oxygen added

37
Q

What is meant by a reducing agent

A

The substance that reduces (removes the oxygen) from another substance e.g.sodium is reducing agent that removes the oxygen from magnesium oxide

38
Q

What is the termite reaction

A

An exothermic reaction between iron oxide and aluminium
Example of a redox reaction
The iron oxide is reduced
The aluminium is oxidised

39
Q

Write the word equation for the thermite reaction

A

Aluminium + iron oxide ——————> aluminium oxide + iron

Year 9 Chemistry (2 decks)

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