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.

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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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  1. 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
  2. A compound is a substance which contains .......
    In theory, the elements could be separated using chemical reactions but that is not always straightforward
  3. Which of these is NOT a compound?
    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
  4. Which of these word equations is INCORRECT?
    Whoever wrote it forgot to change the name of chlorine to chloride in the compound
  5. 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
  6. The formula of methane is CH4. Which of these is true?
    It contains one atom of carbon joined to four atoms of hydrogen. Can you see how you get that from the formula?
  7. Which is the correct formula equation?
    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
  8. 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
  9. The name of the most likely compound that is formed when iron burns in sulphur is .......
    There are two elements joining together so the name ends in -ide
  10. The smallest particle of carbon dioxide CO2 is called .......
    Remember, compounds that are made from two non-metals joined together exist as molecules

Author: Sue Davison

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