*Topic 1-elements mixtures and compounds

Question 1

Explain what an element is

Answer 1

Materials that cannot be split up into anything simpler by chemical methods. They contain only one type of atom

Question 2

Give 3 examples of elements

Answer 2

Aluminium
Calcium
Bromine

Question 3

Name properties of metals

Answer 3

Shiny solids
Good conductors of heat 
Usually have high melting points 
Usually malleable 
Can be a gas, solid or liquid at room temperature

Question 4

Name properties of non metals

Answer 4

Non-metallic solids tend to be soft and brittle
Usually dull
Poor conductors of heat
Usually have low melting and boiling points

Question 5

What is a compound

Answer 5

A pure substance containing atoms of two or more elements chemically combined. It can not be separated easily. It has different properties from the elements that it contains

Question 6

What is a mixture

Answer 6

Two or more substances mixed together, they can be separated easily by physical methods

Question 7

Describe who iron and sulphur mixture can be separated according to their physical properties

Answer 7

Iron is a grey, shiny solid
Sulfur is a yellow powder
Iron-sulfur mixture is yellow power, grey solid
Iron Sulfide is a grey black solid

Question 8

What is a molecule

Answer 8

Two or more atoms chemically bonded together