Chemical Change
What is an atom and what is it made of?
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Independent Learning
Watch this neat interactive video from BBC Bitesize to refresh your understanding of chemistry. Then have a go at building your own atoms, naming them and using atomic and mass numbers to identify elements at this Learn Chemistry website. You could also try these Periodic Table games or challenge a friend to some chemistry-based Penalty Shoot-outs. |
Here are the rest of the first 20 Elements that we haven't met yet...
1 - Hydrogen (H) - a highly flammable and light gas
6 - Carbon (C) - a key element in all living things (and diamond)
11 - Sodium (Na) - a highly reactive metal
14 - Silicon (Si) - a highly conductive metalloid
16 - Sulfur (S) - a yellow non-metal solid which makes a smelly gas compound
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2 - Helium (He) - a very light, inert gas
10 - Neon (Ne) - an inert gas which gives off light in radiation.
12 -Magnesium (Mg) - a reactive metal with bright white flash
15 - Phosphorus (P) - a non-metal, vital nutrient for plant growth
20 - Calcium - a soft, reactive metal
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CHEMICAL CHANGES
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A chemical change is a reaction where one or more new substances are formed. Bonds holding atoms together in a molecule are broken or formed.
You can tell if a chemical reaction has occurred because:
A chemical change is much harder to reverse than a physical change, e.g. melting or boiling, because new chemical bonds have been formed. For example, you can't "un-fry" an egg or "un-burn" petrol. |