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GCSE Chemistry > C3.4 Analysis and Synthesis > Flashcards

C3.4 Analysis and Synthesis Flashcards

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1
Q

Flame colour of lithium

A

crimson

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2
Q

Flame colour of sodium

A

yellow

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3
Q

Flame colour of potassium

A

lilac

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4
Q

Flame colour of calcium

A

red

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5
Q

Flame colour of barium

A

green

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6
Q

What metal ions form a white precipitate when reacted with sodium hydroxide?

A

aluminium, calcium or magnesium

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7
Q

Flame colour of magnesium

A

no colour

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8
Q

What colour precipitate is formed when sodium chloride reacts with copper?

A

blue

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9
Q

What colour precipitate is formed when sodium chloride reacts with iron(II)?

A

green

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10
Q

What colour precipitate is formed when sodium chloride reacts with iron(III)?

A

brown

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11
Q

Dilute acid +carbonate

A

= carbon dioxide (limewater cloudy)

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12
Q

When you react nitric acid, silver nitrate solution and chlorine, what colour precipitate is there?

A

white

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13
Q

When you react nitric acid, silver nitrate solution and bromide, what colour precipitate is there?

A

cream

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14
Q

When you react nitric acid, silver nitrate solution and iodide, what colour precipitate is there?

A

pale yellow

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15
Q

How do you test for sulphate ions?

A

add HCl and barium chloride solution a white precipitate is formed for sulphate ions

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16
Q

What is equilibrium?

A

the point in a reversible reaction in which the forward and backward rates of reaction are the same

17
Q

In equilibrium, if the forward reaction produces more moles of gas….

A

an increase in pressure decreases the amount of products formed, a decrease in pressure increases the amount of products formed

18
Q

In equilibrium, if the forward reaction produces fewer molecules of gas…

A

an increase in pressure increases the amount of products formed, a decrease in pressure decreases the amount of products formed

19
Q

In euilibrium if the forward reaction is exothermic…

A

an increase in temp decreases the amount of products formed

20
Q

in equilibrium, if the forward reaction reaction is endothermic…

A

an increase in temp increases the amount of product formed, a decrease in temp decreases the amount of products formed

21
Q

Why is nitrogen lost in plants?

A

roots absorb nitrates and die and release the nitrate so farmers need to put nitrate in soil every year

22
Q

When making ammonia, where does nitrogen come from?

A

the air

23
Q

When making ammonia, where does hydrogen come from?

A

natural gas (methane) and steam

24
Q

What process is used when making ammonia?

A

the haber proccess

25
Q

What happens in the Haber process?

A

the elements are passed over an iron catalyst at 450 degrees and 200 atmospheres

26
Q

Why is the pressure not higher?

A

lots of energy to compress, expensive, explosion

27
Q

why do we use a catalyst?

A

Speeds up forward and backward so we get more ammonia quicker

GCSE Chemistry (17 decks)

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