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Compounds 01
What is a compound? Find out in this educational quiz.

Compounds 01

This KS3 Science quiz takes a look at compounds. A chemical compound is a pure chemical substance consisting of two or more different chemical elements that can be separated into simpler substances by chemical reactions. Some compounds are made up from two non-metal elements that have joined together, for example water and carbon dioxide. This type of compound is made from molecules. Other compounds are made when a metal chemically combines with a non-metal. This type of compound is made from a giant structure, not molecules. Sodium chloride and calcium oxide are two examples.

Naming compounds is something that takes a bit of practice to learn - some people get how to do it faster than others. Working out the name of a compound follows certain rules but we don't have the room to tell you all of them here.

You will probably find it easier to name a compound made from one metal and one non-metal easier than naming compounds made from non-metals. The name of the metal comes first and the name of the non-metal is changed to end in -ide. When you see the name of a compound that ends in -ate, you can tell that there is oxygen in it. An example is that sodium sulphate is the metal sodium joined to sulphur and oxygen.

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The name of the most likely compound that is formed when iron burns in sulphur is .......
iron oxide
iron sulphate
iron sulphide
sulphuric acid
There are two elements joining together so the name ends in -ide
The number of different elements in calcium carbonate (CaCO3) is .......
The easy way to do this is to count the capital letters in the formula. Each element has exactly ONE capital letter. In CaCO3, the three elements are Ca, C and O
Which of these is NOT a compound?
Carbon monoxide
Hydrochloric acid
Chlorine is an element and therefore appears on the periodic table. The others do not appear on the periodic table so they cannot possibly be elements
A compound is a substance which contains .......
only one type of atom
only two types of atom
two or more chemicals which can be easily separated
two or more elements chemically joined together
In theory, the elements could be separated using chemical reactions but that is not always straightforward
Which is the correct formula equation?
Mg + O → MgO
Mg + O2 → MgO2
2 Mg + O2 → Mg2O2
2 Mg + O2 → 2 MgO
If you count up the number of atoms on each side of the equation, they are the same - two of magnesium and two of oxygen
The correct formula for carbon tetrachloride is .......
The clue is in the word tetra - that means four and since it is in front of the 'chloride' bit of the name, there must be four chlorine atoms involved
Which of these word equations is INCORRECT?
Copper + oxygen → copper oxide
Hydrogen + chlorine → hydrogen chlorine
Iron + chlorine → iron chloride
Magnesium + oxygen → magnesium oxide
Whoever wrote it forgot to change the name of chlorine to chloride in the compound
The formula of methane is CH4. Which of these is true?
A molecule of methane contains five atoms
A molecule of methane contains five different elements
An atom of methane contains two different elements
Methane contains five molecules
It contains one atom of carbon joined to four atoms of hydrogen. Can you see how you get that from the formula?
The smallest particle of carbon dioxide CO2 is called .......
a molecule
a proton
an atom
an ion
Remember, compounds that are made from two non-metals joined together exist as molecules
The correct number of atoms in a molecule of copper sulphate (CuSO4) is .......
One Cu, one S, four O. If you find reading formulae difficult, don't worry, you will have plenty more practice when you study science at GCSE. There are some simple rules that need to be learned, not everyone sees them straight away
Author:  Sue Davison

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