3rd Year GCSE stuff

Question 1

Define an isotope

Answer 1

Isotopes are atoms with the same number of protons but different numbers of neutrons.

Question 2

How to calculate the relative atomic mass of an element

Answer 2

RAM = (abundance/100 x mass number) + (abundance/100 x mass number). Both brackets are different isotopes of the same element.

Question 3

Relative charge and mass of electrons, neutrons and protons.

Answer 3

Proton: Mass = 1 Charge = +1
Neutron: Mass = 1 Charge: 0
Electron: Mass = 0.0005 Charge = -1

Question 4

True or false? Groups are vertical and periods are horizontal.

Answer 4

True

Question 5

What is the loss of electrons called?

Answer 5

Oxidisation

Question 6

What is the gain of electrons called?

Answer 6

Reduction

Question 7

Define ionic bonding

Answer 7

Ionic bonding is the electrostatic attraction between oppositely charged ions.

Question 8

How are ionic compounds structured?

Answer 8

In an ionic compound, the ions are arranged in a giant ionic lattice.

Question 9

Why do ionic compounds have high melting points?

Answer 9

Ionic bonds are very strong
In a giant ionic lattice there are lots of ionic bonds
Breaking all the ionic bonds requires a large amount of energy

Question 10

Describe the method for making salt crystals

Answer 10

Add excess base to hot acid and stir.

Filter out the excess base.

Heat the filtrate until crystals appear.

Leave the solution to cool for a week.

Filter out the crystals.

Dry the crystals with filter paper.