Atoms And Elements

Question 1

What is an element?

Answer 1

A substance that be split into anything simpler by chemical reactions.

Question 2

What are atoms?

Answer 2

The smallest particles of an element.

Atoms of one element are the same but different from atoms of other elements.

Question 3

Explain the periodic table?

Answer 3

There are over 100 elements.
All elements are shown with their own symbol.
Each symbol is 1 or 2 letters e.g. Copper Cu, gold Au, carbon C

Question 4

What does properties mean?

Answer 4

The properties of a substance are how we describe or measure it.
Metals and non - metals have different properties.

Question 5

What are common properties of metals?

Answer 5

Conduct heat and electric well.
Shiny 
High melting point
Left side of periodic table.
3 metals are magnetic.
Can burn to form alkaline oxide.
Flexible

Question 6

What are the properties of non - metals?

Answer 6

Conduct heat and electric poorly.
Dull
Mostly are solids or gas.
Right side of periodic table.
Not magnetic
Can burn to make acidic oxides.
Brittle

Question 7

What are compounds?

Answer 7

Elements can join together to make compounds.
The compound name tells you the elements in it.
Compounds of two elements end in ‘-ide’ e.g. Carbon dioxide.

Question 8

What is a molecule?

Answer 8

A molecule is the smallest particle of many compounds.
Molecules are made up of atoms.
Some elements are made of molecules. E.g. Oxygen is two oxygen atoms joined together O2.

Question 9

What does the chemical formula tell you?

Answer 9

The chemical formula tells you how many atoms of each element are in a compound.
A compound has always got the same elements in the same ratio.

Question 10

How do compounds differ from the elements in them?

Answer 10

The properties of a compound are different from the elements that make it up.
Hydrogen is an explosive gas, oxygen fuels a fire. Together the make water.