Elements make compounds
Goggles, bench mat, tongs, bunsen, lighter and magnesium.
CAREFULLY put magnesium in flame.
What energy is being released?
When magnesium is burned, energy is released as light.
Is there a new substance being formed?
A new substance forms, it is white.
Is this new substance lighter or heavier?
-This new substance is heavier as there are two different elements in the substance, they are magnesium and oxygen.
When elements join to make a compound, energy is released and a new substance is formed.
A word which means ‘energy released’ is exothermic.
What do you think endothermic means?
If two identical elements combine then the name doesn’t change.
.e.g. oxygen + oxygen oxygen
When two elements join the name ends with ide
e.g. Magnesium + oxygen magnesium oxide