C3.4 Analysis and Synthesis Flashcards Preview

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Flashcards in C3.4 Analysis and Synthesis Deck (27):
1

Flame colour of lithium

crimson

2

Flame colour of sodium

yellow

3

Flame colour of potassium

lilac

4

Flame colour of calcium

red

5

Flame colour of barium

green

6

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

aluminium, calcium or magnesium

7

Flame colour of magnesium

no colour

8

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

blue

9

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

green

10

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

brown

11

Dilute acid +carbonate

= carbon dioxide (limewater cloudy)

12

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

white

13

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

cream

14

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

pale yellow

15

How do you test for sulphate ions?

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

16

What is equilibrium?

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

17

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

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

18

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

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

19

In euilibrium if the forward reaction is exothermic...

an increase in temp decreases the amount of products formed

20

in equilibrium, if the forward reaction reaction is endothermic...

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

21

Why is nitrogen lost in plants?

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

22

When making ammonia, where does nitrogen come from?

the air

23

When making ammonia, where does hydrogen come from?

natural gas (methane) and steam

24

What process is used when making ammonia?

the haber proccess

25

What happens in the Haber process?

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

26

Why is the pressure not higher?

lots of energy to compress, expensive, explosion

27

why do we use a catalyst?

Speeds up forward and backward so we get more ammonia quicker