Calculations

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1.30 - Calculating percentage yield
1.33 - Calculate empirical and molecular formulae from experimental data 
1.35 - Calculations involving gas volumes and molar volume of gas

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1.25 Be able to write word equations and balanced chemical equations

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Word equations have just the names of the reactants and products involved: Hydrogen + Oxygen > Water H + O > H 2 O ^ 1 oxygen and 1 hydrogen on the left and on the right 2 hydrogen and 1 oxygen -> not balanced Balanced equations are the symbols of the products and reactants including the numbers of each, there must be an equal number of each element on both sides of the equation, if there are not you can alter this by putting the right number in front of a symbol: 2H + O > H2O ^2 hydrogens and 1 oxygen on both sides State symbols: In balanced equations these state symbols go after a element or compound to show what state it is in (S) solid (L) liquid (G) gas (Aq) aqueous/ solid dissolved in liquid
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1.35 understand how to carry out calculations involving gas volumes and the molar volume of gas

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At standard temperature and pressure, one mole of any gas will occupy 24000 cm3; also known as 24dm3. Calculating molar volume from mass Example: 976 cm 3 of oxygen was found to have a mass of 1.3 g Calculate the molar volume of oxygen, under these conditions. Volume = mass x no. of moles Mass of oxygen, O 2 , = 32.0 g. Volume of 1 g = 976 ÷ 1.3 Hence, 32 g = (976 ÷ 1.3) × 32 = 24024 cm 3 Answer: 24.0 is the volume of 32.0 g of O 2 .
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1.1, 1.2 - States of matter

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States of matter: Solid - Difficult to compress - Fixed shape - Fixed volume  - Particles are closely packed Liquid - Molds shape to container  - Fixed volume  - Cannot be compressed  - Particles far apart  Gas - Particles far apart - No fixed shape - No fixed volume  - Easy to compress 
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