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Flashcards in Unit 3 Deck (42):
1

In what ways do metallic bonds differ from covalent bonds?

Metals are good conductors

2

Write the balanced ionic equation for

aluminium + oxygen ➡️ aluminium oxide

3+ 2-
4Al + 3O ➡️ 2 ( Al ) ( O )
2 2 2 3

3

Write the balanced ionic equation for

sodium + oxygen ➡️ sodium oxide

+ 2-
4Na + O ➡️ 2 ( Na ) O
2 2

4

Put these three metals in order (most reactive first)
Sodium, Potassium, Lithium

Potassium
Sodium
Lithium

5

Put these four metals in order (least reactive first)
Zinc, Iron, Magnesium, Copper

Copper
Iron
Zinc
Magnesium

6

Write the balanced ionic equation for

zinc + sulphuric acid ➡️ zinc (ll) sulphate + hydrogen

+ 2- 2+ 2-
Zn + 2H + SO ➡️ Zn + SO + H
4 4 2

7

What special name is given to the corrosion of iron?

Rusting

8

What colour does the Ferroxyl indicator turn when added to the Fe2+ ions in solution?

Blue

9

What colour does the Ferroxyl indicator turn when added to the OH- ions in solution?

Pink

10

What does Oxidation mean?

The loss of electrons

11

What does Reduction mean?

The gain of electrons

12

Write the oxidation and reduction ion-electron equations for
+ - 2+
Mg + 2H + 2Cl ➡️ Mg + 2Cl + H
2

2+ -
OX - Mg ➡️ Mg + 2e
+ -
RED - 2H + 2e ➡️ H
2

13

Write ion-electron equations for the reactions between zinc and nitric acid

2+ -
OX - Zn ➡️ Zn + 2e
+ -
RED - 2H + 2e ➡️ H
2

14

Combine the oxidation and reduction steps to form a balanced redox reaction

Ce + e ➡️ Ce
- -
2Br ➡️ Br + 2e
2

4+ - 3+
2Ce + 2e ➡️ 2Ce (x 2)
- -
2Br ➡️ Br + 2e
2
4+ - 3+
2Ce + 2Br ➡️ 2Ce + Br
2

15

Combine the oxidation and reduction steps to form a balanced redox reaction
4- + - 2+
MnO + 8H + 5e ➡️ Mn + 4H O
2
2+ 3+ -
Fe ➡️ Fe + e

4- + - 2+
MnO + 8H + 5e ➡️ Mn + 4H O
2
2+ 3+ -
5Fe ➡️ 5Fe + 5e (x 5)
4- + 2+ 2+ 2+
MnO + 8H + 5Fe ➡️ Mn + 5Fe + 4H O
2

16

Draw the full structural formula for but-1-ene

H H H H
H - C = C - C - C - H
H H

17

Draw three units of but-1-ene in the shape of a H

H H H H H H
C = C C = C C = C
H C H H C H H C H
2 5 2 5 2 5

18

Draw part of the polymer when three molymer units of but-1-ene join

H H H H H H
- C - C - C - C - C - C -
H C H H C H H C H
2 5 2 5 2 5

19

What is the name of the polymer when three molymer units of but-1-ene join?

Polybutene

20

Draw the repeating unit of polybutene

H H
[ - C - C - ]
H C H
2 5 n

21

Draw the full structural formula for pent-1-ene

H H H H H
H - C = C - C - C - C -
H H H

22

Draw three units of pent-1-ene in the shape of a H

H H H H H H
C = C C = C C = C
H C H H C H H C H
3 7 3 7 3 7

23

Draw part of the polymer when three units of pent-1-ene join

H H H H H H
- C - C - C - C - C - C -
H C H H C H H C H
3 7 3 7 3 7

24

What is the name of the polymer when three units of the monomer pent-1-ene join?

Polypentene

25

Draw the repeating unit of polypentene

H H
[ - C - C - ]
H C H
3 7 n

26

What are some uses of polyesters?

Plastic bottles, school ties, blazers

27

Which two elements do you require in order to make ammonia?

Nitrogen and Hydrogen

28

Where would you find Nitrogen and Hydrogen?

Nitrogen in the air and Hydrogen in water

29

What does the double headed arrow mean?

The reaction is reversible

30

Calculate the percentage mass of nitrogen in ammonium nitrate

% nitrogen = 28 ➗ 80 x 100
= 35%

31

Alpha particles

4
He
2

32

Beta particles

0
e
-1

33

Write a nuclear equation for

alpha decay of polonium - 210

210 206 4
Po ➡️ Pb + He
84 84 2

34

Write a nuclear equation for

beta decay of strontium - 90

90 90 0
Sr ➡️ Y + e
38 39 -1

35

Write a nuclear equation for

alpha decay of radium - 226

226 222 4
Ra ➡️ Rn + He
88 86 2

36

Aluminium - 27 can absorb an alpha particle with the emission of a neutron, forming a product Y. Write a nuclear equation to illustrate this reaction and identify Y.

27 4 30 1
Al + He ➡️ P + n
13 2 15 0

37

An 80 gram sample of a radioisotope of phosphorus has a half-life of 14 days. Calculate the remaining mass of the sample after 56 days.

56 days is four half lives

80g - 40g - 20g - 10g - 5g

38

A radioisotope with an activity of 200 counts per minute is kept for 40 minutes and the count rate drops to 50 counts per minute. What is the half-life of the isotope?

200 - 100 - 50

The half-life is 20 minutes

39

Carbon - 14 has a half-life of 5600 years. An analysis of charcoal from a wood fire shows that it's C-14 content is 25% that of living wood. How many years have passed since the wood for the fire was cut?

100% - 50% - 25%

11200 years

40

What are some uses of Radioisotopes?

gamma rays from cobalt-60 are used to kill cancerous cells and Americum-241 is used in smoke detectors.

41

What does delocalised mean?

Delocalised means not confined to a particular region of space

42

What is meant by the term half-life?

The time taken for the radioactivity of a specified isotope to fall to half its original value.