C3.1 - Equations, reacting masses and limiting reactants

Which cathodes do oxidation and reduction happen at?

RedCat - Reduction at Cathode

AnOx - Oxidation at Anode

Na --> Na+ + e-

Oxidation or Reduction?

Single element on left means oxidation

Na+ + e- --> Na

Oxidation or reduction?

Single element on Right means Reduction

Writing half equation 2 steps:

- balance it

- balance charges by seeing overall charge

- when adding electrons it minuses the charge on that side

What is a mole?

Amount of substance that contains 6.02 x 10^-23 particles

What are the two equations for moles?

- Moles = Mass/Mr

- Moles = particles/avogradro's constant

How to do reacting masses?

Find moles = mass/mr of given

Find moles of what you're trying to find out using ratio

Using the moles and mr of that, find mass

How to write ionic equations?

1. Write out equation

2. Make into ions

3. Cancel out ions that appear on both sides

4.Write out ionic equation

Why might mass change in conservation of mass?

- If mass increases, it's because when the gas reacts to form part of the product, it becomes contained inside the vessel. The particle model helps explain this by showing that particles are rearranged, not lost or created.

What does (aq) mean as a state symbol?

aqueous, which means it it soluble in water

How to do limiting reactants equation?

- Divide mass of each substance by its Mr to find how many moles of each substance were reacted

- Divide by smallest number of moles from those two answers

- Compare ratios and find what is in excess and what is limiting

How to figure out maximum mass of something that can be formed?

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