Year 9 Assessment 1

Question 1

How much smaller is a nanometre than a metre?

Answer 1

A nanometre is a billion times smaller

5 metres = 5 x 10-9

Question 2

What would a 5.3x10-2 metre be in nanometres?

Answer 2

It would be 5.3x10)7, you have to add a 9 to the superscript.

Question 3

What would 921 nanometres be in metres?

Answer 3

9.21x10)-7

Question 4

Name the charges and group names on groups 7 and 0

Answer 4

Group 7 are the halogens, they have a charge of 1-.
Group 0 are the nobel gases, they have a charge of nothing. The noble gases are unreactive but the reactivity of the halogens decreases as you go down the group.

Question 5

Name the charges and group name for group 1.

Answer 5

The charges on group one are 1+, they are called the alkali metals. They get more reactive as you go down.

Question 6

Describe the reactivity of the transition metals.

Answer 6

The transition metals are unreactive in water and oxygen, have high melting points and a high density. They can be used as catalysts to speed up reactions.

Question 7

What must sulphur do to become an ion?

Answer 7

It has an outer shell of 6, since it is in group 6, therefore it must gain 2 electrons, so now it has a charge of 2-.

Question 8

What is a rule about the group numbers and the atoms in them?

Answer 8

The rule is that the group number has the same number of electrons on its outer shell as the group number.