Unit C2, C2.1 Mark scheme
Structure and bonding
1.

(i)

B or 2, 8, 1

for one mark

1

(ii)

A or 2, 8

for one mark

1
[2]

2.

(a)

C16 H34

for one mark

1

(b)

electron

gains one mark

2

but shared electrons gains 2 marks
[3]
3.

(a)

all electrons correct (inner shell need not be shown) three bond pairs and two electrons anywhere else can use dots, crosses or e’s in any combination

1

(b)

covalent

1

accept phonetic spelling; do not accept convalent

[2]
4.

(a)

2, 8, 8, 1

1 for 1 mark

(i)

(b)

4
F

for 1 mark
Ignore symbol in middle but structure must be drawn NOT 2,7

+

(ii)
N
Fa

F
(1) for charges
(1) for each structure

If covalent; can score mark for changes but not for diagram
Arrow showing electron transfer from metal atom to non-metal atom = 2 marks
If the ions are not identified then cannot score mark for changes
[5]
5.

(a)

any (must be named)

1

(b)

F2

1

(c)

–/F–

1

(d)

(i)

covalent

1

(ii)

made of molecules etc. type of bonding when non-metals react.

1
[5]

6.

(a)

(i)

Page 1 of 2

rings of 2, 8 and 3 electrons credit 2, 8, 3 pay particular attention to the outer shell in diagrams

1

Unit C2, C2.1 Mark scheme
(ii)
(b)

rings of 2, 8 and 7 electrons credit 2, 8, 7 pay particular attention to the outer shell in diagrams

(i)

1

labels not required on atoms charges need to be shown on ions reference to outer shell is required otherwise a maximum of two marks structure of atoms/ions marks
(ring of 2, 8, 1 for sodium) or the outer shell of sodium only
1
contains 1 electron credit 2, 8, 1 or an ion 2, 8 or two circles and 1 electron in outer shell
(ring of 2, 6 for oxygen) or outer shell only contains 6 electrons credit 2, 6 or an ion 2, 8 or two circles

1