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Example question: _H₂O --> _O₂ + _H₂ First, work out how many of each element you have on each side. For example in this equation, Left: 2 hydrogen and 1 oxygen Right: ...

The right ventricle pumps blood towards the human heart. 

Mass of oxygen in balloon = 0.02 x 0.21 Mr (O2) = 16 x 2 = 32 Moles = mass / Mr = (0.02 x 0.21) / 32 = 1.31 x 10^4 moles Or 0.000131 moles

The general formula for when a acid reacts with a salt (sodium) is that a salt and hydrogen is produced. This should be learnt off by heart!

So, our acid is Hydrochloric acid, and when this reacts ...

Stage one: Carbon enters the atmosphere by - respiration in organisms (e.g. animals breathing) - combustion (e.g. burning of fossil fuels/ wood) - decomposition and decay (microorganisms respiration) Stag...