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Atoms and Elements 03
Chlorine is used to keep swimming pools clean using a chemical reaction.

Atoms and Elements 03

This KS3 Science quiz takes a further look at atoms and elements. Of the 118 known elements, about 90 occur naturally in space or on Earth, but many of them exist in only very small quantities. Most of the elements are combined with each other in the Earth's crust or atmosphere. When elements are combined with other different elements, we say they have formed a compound. Salt is an example of a compound (made from the elements sodium and chlorine joined together), so is water (made from hydrogen and oxygen joined together). There are some that are not very reactive, like gold, and these don't usually form compounds but can be found occuring on their own.

When elements join together to form compounds, their names need to be joined together too. If just two elements join together, one is usually a metal and the other is usually a non-metal. To get the name of the compound, you put the name of the metal first and then change the name of the non-metal to make it end in -ide. This sounds complicated at first but once you get used to it, it is dead easy to do.

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1.
Which of these substances is an element?
Air
Fire
Oxygen
Water
Air is a mixture, fire is not an actual substance, it is just a place where something is burning and water is a compound
2.
The smallest part of an element is called .......
A mixture
A molecule
An atom
An ion
An atom can actually be split into smaller particles called protons, neutrons and electrons but you can't do that using chemicals
3.
When the elements lead and bromine combine together, the name of the substance formed is called .......
Lead bromate
Lead bromide
Lead bromite
Lead bromium
To remember: when naming a compound with two elements in it, the name of the metal comes first and the name of the non-metal is changed to end in -ide
4.
Which of these substances is an element?
Chlorine
Ice
Methane
Sodium chloride
The other three are compounds. A compound is made from different types of atom CHEMICALLY JOINED together. If the different types of atom are not chemically joined together, you have a mixture
5.
An element is a substance that .......
Can be split up by physical methods
Can be split up into simpler parts by a chemical reaction
Is made up of different kinds of atom
Is made up of only one kind of atom
So if you had a sample of a substance that contained only carbon atoms, you would have a sample of the element carbon
6.
When two elements combine, the name of the compound will usually end in .......
-ate
-ide
-ite
-ium
The situation is a bit more complicated when you get more than two elements chemically joined together!
7.
C is the correct chemical symbol for .......
Calcium
Carbon
Chlorine
Cobalt
You do not need to know the symbols of all of the elements but it helps your study of science if you know a few
8.
Which of these metals is a pure element?
Brass
Bronze
Silver
Steel
The others are are all mixtures of two or more elements
9.
The correct chemical symbol for magnesium is .......
Mg
mg
MG
mG
If the symbol has two letters, the first is a capital and the second is not
10.
Which of these show a diatomic element?
CO
H₂
He
SO₂
Diatomic = 2 atoms. Element = substance containing only one type of atom
Author:  Sue Davison

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