C4 Chemical change Flashcards Preview

AQA GCSE Chemistry > C4 Chemical change > Flashcards

Flashcards in C4 Chemical change Deck (42)
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1

What is produced when metals react with oxygen?

A metal oxide

2

HIGHER TIER What does OIL RIG stand for?

Oxidation Is Loss & Reduction Is Gain (of electrons)

3

What is oxidation?

When a substance gains oxygen (HIGHER TIER or loses electrons)

4

What is reduction?

When a substance loses oxygen (HIGHER TIER or gains electrons)

5

What type of ions do metals form?

Positive ions

6

What type of ions do non-metals form?

Negative ions

7

Put these metals into order of reactivity from most to least reactive: copper, magnesium, lithium, calcium, iron, zinc, potassium and sodium

potassium, sodium, lithium, calcium, magnesium, zinc, iron and copper

8

What is produced when a metal reacts with an acid?

A salt and hydrogen gas

9

What is the test for hydrogen gas?

It burns with a squeaky pop

10

Name a metal that is found 'natively' in the ground

Gold / platinum

11

What is the name for a rock that contains enough metal to make it economic to extract it?

An ore

12

What is formed when a metal carbonate and an acid react?

A salt + water + carbon dioxide

13

What is formed when a metal reacts with water?

A metal hydroxide

14

What is formed when magnesium reacts with nitric acid?

magnesium nitrate + hydrogen gas

15

What is formed when lithium reacts with water

lithium hydroxide

16

What colour does universal indicator go in a strong acid?

Red

17

What colour does universal indicator go in a weak acid?

yellow or orange

18

What colour does universal indicator go in a neutral solution

green

19

What colour does universal indicator go in a weak alkali?

blue

20

What colour does universal indicator go in a strong alkali?

purple

21

Why can carbon be used to extract iron from its ore?

Iron is less reactive than carbon so carbon 'steals' the oxygen from the iron oxide

22

Give a word equation for the extraction of iron from iron oxide by carbon

iron oxide + carbon -> iron + carbon dioxide

23

What is formed when calcium reacts with sulfuric acid?

calcium sulfate + hydrogen

24

What is reduced in this reaction: iron oxide + carbon -> iron + carbon dioxide

The iron oxide is reduced (loses oxygen)

25

What is oxidised in this reaction:

iron oxide + carbon -> iron + carbon dioxide

The carbon is oxidised (gains oxygen)

26

What is formed when magnesium reacts with hydrochloric acid?

magnesium chloride + hydrogen

27

What is an acid?

Something that produces H+ (hydrogen) ions

28

What is the formula for hydrochloric acid?

HCl

29

What is the formula for sulfuric acid?

H2SO4

30

What is the formula for nitric acid?

HNO3