Page 135 - Knowledge Organiser Yr7 24-25

Knowledge Base: Science 7.7 Atoms, Elements and Compounds Year 7
3. Compounds
3.1
What is a compound?
A substance made from two or more different elements chemically bonded together
3.2
What is a mixture?
Different substances that are not chemically bonded together and which can be easily separated
3.3
What is a molecule?
Two or more non-metal atoms chemically bonded together
3.4
What is easier to separate, a mixture or a compound?
A mixture
3.5
What forms between atoms in a compound to hold them together?
Bonds
3.6
Do the following diagrams represent elements, compounds or mixtures?
Element Compound Mixture
4. Chemical Formulae
4.1
What does a chemical formula show?
How many of each type of atom there is in a compound
4.2
Which chemical formula is written correctly? Al2O3 Al2O3 Al2O3
Al2O3
4.3
What is the chemical formula for this compound?
NH3
4.4
What is the chemical formula for this compound?
CO2
4.5
What is the chemical formula for this molecule?
N2
5. Naming Compounds
5.1
When naming a compound with a metal and a non-metal, which comes first in the name?
The metal
5.2
If a compound
has a metal and a non-metal, what is the non- metal ending?
...ide
5.3
If a compound has
a metal, oxygen and another non- metal, what is its ending?
...ate
6. Making Compounds
6.1 What are reactants? The substances you start with in a reaction
6.2 What are products? The substances you end up with in a reaction
6.3
Which is correct way of writing a word equation Reactants = Products OR ReactantsProducts
Reactants  Products
6.4
Write a word equation for the iron metal reacting with the non-metal sulphur to make iron sulphide
Iron + SulphurIron Sulphide
6.5
When different substances are mixed together, what happens to their properties?
They are retained (they do not change)
6.6
When different substances chemically bond together, what happens to their properties?
They change
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