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CALCULATIONS

Moles, reacting masses, empirical formula and water of crystallisation.
On this page you will find video tutorials, notes and exam-style questions with worked answers on the concepts above and more.
Select the video you need and download the matching notes. Then apply your knowledge to the exam-style questions.

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How Many Atoms

03:10

How Many Atoms

How to calculate the number of each type of atom in a compound.

Ar and Mr

02:10

Ar and Mr

Finding Ar and using it to calculate Mr

Mass Moles and Mr

02:14

Mass Moles and Mr

Using the triangle to calculate moles mass and Mr

Reacting Masses - Moles Method

03:53

Reacting Masses - Moles Method

Using the moles method to calculate reacting masses.

Reacting Masses - Ratio Method

02:52

Reacting Masses - Ratio Method

Using the ratio method to calculate reacting masses.

Percentage Yield

01:37

Percentage Yield

Calculating percentage yield in reactions.

Empirical Formula

03:04

Empirical Formula

Calculating empirical formula from mass data or % composition.

Molecular Formula

01:27

Molecular Formula

Using Mr and empirical formula to work out molecular formula.

GCSE CALCULATIONS NOTES

HOW MANY ATOMS

AR AND MR

MOLES, MASS AND MR

REACTING MASSES - MOLES METHOD

REACTING MASSES - RATIO METHOD

PERCENTAGE YIELD

EMPIRICAL FORMULA

MOLECULAR FORMULA

WATER OF CRYSTALLISATION

USING EXPERIMENTAL DATA

CONCENTRATION CALCULATIONS

GAS VOLUME CALCULATIONS

Exam-Style Calculations

11:18

Exam-Style Calculations

How to answer common GCSE calculation questions

Calculations: Videos

EXAM-STYLE QUESTIONS

ALL CALCULATIONS

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