Topic 3 Structure And Uses Of Materials

Question 1

What’s happens to the name of the 2nd element if you combine 2 elements like Iron and Sulphur.

Answer 1

Most of the time the last 3 letters of the 2nd element get replaced with -ide like Iron Sulphur becomes Iron Sulphide.

Question 2

What are the Valency Table’s Nr?

Answer 2

1 2 3 4 5 6 7 8

1 2 3 4 3 2 1 0

Question 3

Formula using Valency.

Answer 3

Example

Sodium Oxide
Symbol Na O
Valency 1 2
X
Swap 2 1
Divide 2 1
Formula Na2 O

Question 4

Another question.

Answer 4

Carbon Sulfide
Symbol                C      S
Valency               4       2
                                   X
Swap                   2       4
Divide                  1       2
Formula              C     S2