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Elements make compounds. Substances Miss Doig. Explosive experiment . Goggles, bench mat, tongs, bunsen, lighter and magnesium. CAREFULLY put magnesium in flame. Making a compound. What energy is being released? When magnesium is burned, energy is released as light.

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elements make compounds

Elements make compounds

Substances

Miss Doig

explosive experiment
Explosive experiment
  • Goggles, bench mat, tongs, bunsen, lighter and magnesium.
  • CAREFULLY put magnesium in flame.
slide3

Making a compound

  • 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.
elements make compounds1
Elements make compounds
  • 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?
elements and symbols that you should know

Elements and symbols that you should know:

  • Oxygen
  • Fluorine
  • Neon
  • Magnesium
  • Aluminium
  • Silicon
  • Phosphorus

O

F

Ne

Mg

Al

Si

P

  • Hydrogen
  • Helium
  • Lithium
  • Beryllium
  • Boron
  • Carbon
  • Nitrogen

H

He

Li

Be

B

C

N

slide7

This happens with the following elements:

  • H2
  • N2
  • O2

These elements always go around in pairs. For example, hydrogen looks like this:

If two identical elements combine then the name doesn’t change.

.e.g. oxygen + oxygen  oxygen

slide8

Sodium + chlorine

  • Magnesium + fluorine

When two elements join the name ends with ____ide

e.g. Magnesium + oxygen magnesium oxide

slide9

When three or more elements combine and one of them is oxygen the ending is _____ite or ________ate

e.g. Copper + sulphur + oxygen Copper sulphate

  • Calcium + carbon + oxygen
  • Potassium + carbon + oxygen
  • Sodium + sulphur + oxygen
slide10

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