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😎 Year 9 Chemistry 😎 🩵 > Reactions > Flashcards

Reactions Flashcards

1
Q

What is air made up of

A

Oxygen 21%
Nitrogen. 78%
Argon. 0.9%
Carbon dioxide 0.032%

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2
Q

3 physical properties of oxygen

A

Colourless
Odourless
Gas
(Not very soluble in water, some density as air)

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3
Q

What is the word equation for respiration

A

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

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4
Q

What is the test for oxygen

A

Relights a glowing splint

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5
Q

What chemicals do you need to test for oxygen

A

Hydrogen peroxide
Catalyst manganese dioxide

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6
Q

What is a catalyst

A

A chemical that speeds up chemical reactions without being used up itself

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7
Q

What are some examples of industrial catalysts

A

Iron
Plantium
Vanadium oxide

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8
Q

What is the equation when testing for oxygen

A

Manganese dioxide
Hydrogen peroxide——————————————-> water + oxygen

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9
Q

What is the test for hydrogen

A

With a lighted splint and you will hear a squeaky pop

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10
Q

What chemicals do you need when testing for hydrogen

A

Hydrochloric acid
Magnesium

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11
Q

What is the equation when testing for hydrogen

A

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

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12
Q

What is the test for carbon dioxide

A

After you bubble gas into limewater, the limewater turns from colourless to milky white

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13
Q

What is the equation for testing for carbon dioxide

A

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

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14
Q

What chemicals do you need when testing for carbon dioxide

A

Hydrochloric acid
Marble chips ( calcium carbonate)

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15
Q

What are 3 uses of carbon dioxide

A

Fizzy drinks
Fire extinguisher
Dry ice

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16
Q

2 physical properties of carbon dioxide

A

Gas
Colourless
Odourless

17
Q

2 observations when calcium carbonate is added to hydrochloric acid

A

Fizzing/bubbles of gas
Calcium carbonate disappears

18
Q

List 3 uses of oxygen

A

Welding torches.
Rocket fuel.
Breathing apparatus in hospitals.

19
Q

Name the 2 products of the reaction when candle wax combusts

A

Carbon dioxide and water

20
Q

What does exothermic mean?

A

A reaction that gives out heat
(Temp drops)

21
Q

Why does endothermic mean

A

A reaction that takes in heat

22
Q

What happens when zinc is added to copper?

A

The blue copper sulphate solution turns to a colourless liquid .
The zinc powder turns to brown sludge.
This is exothermic as the temp increases during the reaction

23
Q

What are 3 pieces of evidence to tell us that a chemical reaction is taking place?
When zinc is added to copper

A

Rise in temperature.
Powder disappears.
Liquid changes from blue to colourless

24
Q

What is oxidation

A

An oxidation reaction occurs when a chemical reacts with oxygen. (The adding of oxygen)

25
Q

What is reduction

A

The opposite of oxidation and occurs when a substance loses oxygen. (Removal of oxygen)

26
Q

What is a redox reaction?

A

A reaction where REDuction and OXidation takes place together. (Oxidation and reduction both taking place)

27
Q

Decide what part has been oxidised and reduction

Calcium+magnesium oxide— calcium oxide+ magnesium

A

Magnesium oxide was reduced to magnesium.
Calcium was oxidised to calcium oxide

28
Q

Decide what part has been oxidised and reduction

Zinc oxide+ hydrogen— zinc + water

A

Zinc oxide was reduced to zinc.
Hydrogen was oxidised to water.

29
Q

Decide what part has been oxidised and reduction

Aluminium oxide + potassium— aluminium + potassium oxide

A

Aluminium oxide was reduced to aluminium.
Potassium was oxidised to potassium oxide.

30
Q

Decide what part has been oxidised and reduction

Aluminium + iron oxide— iron+ aluminium oxide

A

Iron oxide was reduced to iron.
Aluminium was oxidised to aluminium oxide.

31
Q

Decide what part has been oxidised and reduction

Copper oxide+ carbon— copper + carbon dioxide

A

Copper oxide reduced to copper.
Carbon oxidised to carbon dioxide.

32
Q

Tell me about a thermite reaction.

A

In the Thermite reaction, the two reactants are iron oxide and Aluminium. The Thermite reaction is a very exothermic reaction as it gives out lots of heat. The reactant iron oxide is reduced to molten iron. This reaction was used to weld train tracks together.

😎 Year 9 Chemistry 😎 🩵 (5 decks)

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