Chemistry- Elements, Compounds & Mixtures

Question 1

What is an element?

Answer 1

Elements are materials that cannot be split up into anything simpler by chemical methods.
Elements are only made up of one type of atom.

Question 2

What is an atom?

Answer 2

An atom is the simplest particle of an element that can exist on its own.

Question 3

What is a molecule?

Answer 3

A molecule is made up of two or more atoms joined together.

Question 4

List the three properties of metallic items:

Answer 4

Good conductors of energy
Good conductors of heat
High boiling points/ melting points
Shiny solids
Are all solids at room temperature at room temperature except mercury.
Usually malleable and ductile

Question 5

List three properties of non-metallic elements.

Answer 5

Bad conductors of electricity
Bad conductors of heat
Usually dull (diamond is an exception)
Brittle (diamond is an exception)
Usually have low boiling points/melting points
Can be a solid/gas/liquid at room temperature.

Question 6

What is a compound?

Answer 6

A compound is a material that is made up of two or more different elements chemically joined together.

Question 7

What is the rule when two elements are joined together to make a compound?

Answer 7

The second element ends in ‘ide’
E.g.
Iron + sulfur = iron sulfide

Question 8

What is the rule when oxygen is added to make a compound?

Answer 8

The second element ends in ‘ate’
E.g.
Copper + Sulfur + Oxygen = copper sufate

Question 9

What is the word equation for Magnesium Oxide?

Answer 9

Magnesium + Oxygen = Magnesium Oxide

Question 10

What is the word equation for Iron Sulfate?

Answer 10

Iron + sulfur + oxygen = Iron Sulfate

Question 11

What is a mixture?

Answer 11

A mixture is two or more substances mixed together that are easy to separate.