and quantitative chemical analysis

(plus links to qualitative chemical  tests)

Doc Brown's Chemistry KS4 science GCSE, IGCSE, O Level and GCE-AS Advanced A Level Revision Notes


On-line Quantitative Chemistry Calculations

Online practice exam chemistry CALCULATIONS and solved problems for KS4 Science GCSE/IGCSE CHEMISTRY and basic starter chemical calculations for A level AS/A2/IB * F/H (foundation/higher) represent easier/harder UK KS4 GCSE/IGCSE/KS4 science-chemistry courses * There are 16 linked sections listed below * EMAIL query? comment e.g. spotted a silly error or request for type of GCSE calculation I don't seem to have covered? In sections 1-16 you can study definitions of the terms used and examples of how to do chemical calculations. Sections 2 to 6 illustrate the basic 'calculation' requirements for most UK GCSE Science students. Sections 1, and 7 to 15 cover most extra material for higher GCSE student in Science, triple award or IGCSE Chemistry. These revision notes and practice questions on how to do chemical calculations and worked examples should prove useful for the new AQA, Edexcel and OCR GCSE (9–1) chemistry science courses.

Just click on the Ncyan.gifcalc4.GIFicons for notes and examples of a particular type of calculation to revise from.

To self-test yourself for revision

click on the icon click me! for a type in answer quiz,

or click me! for a multiple choice quiz of 5Q's selected at random from the database

There are two larger combined quizzes for foundation (F) or higher (H) GCSE/IGCSE students.

F/H suggests general foundation/higher revising guidelines for GCSE level i.e. F+ H = some easy and some hard!

Please note the Quiz feedback either relates directly to the Q [???-xx] OR it may be a typical worked example.

Make sure you understand and can use the symbols: = equal to or equivalent to,

< less than, << much less than, much more than >>, more than >, proportionality sign , ~ approximately equal to

 Links to NOTES and EXAMPLES of types of chemical calculations

Questions-quizzes only for A level are indicated

Many of these pages will help GCSE, IGCSE, O level and a level students

 QUIZZES available

mc = multiple choice, sa = type in short answer

(c) doc bclick me!1. What is relative atomic mass? (Ar)

See also Mass Spectrometer for advanced students) and relative isotopic mass

1. click me!Honly 

or (c) doc bHonly

(c) doc bclick me!2. Calculating relative formula/molecular mass (Mr) of a compound or element molecule

2. click me!F + H

or (c) doc bF + H

.(c) doc bclick me!3. Law of Conservation of Mass experiment and simple reacting mass calculations

3. click me!F + H

or (c) doc bF + H

(c) doc bclick me!4. Composition by percentage (%) mass of elements in a compound

4. click me!F + H

or (c) doc bF + H

(c) doc bclick me!5. Empirical formula and formula mass of a compound from reacting masses (easy start, NOT using moles) me!F + H

or (c) doc bF + H

c) doc bclick me!6a. Reacting mass ratio calculations of reactants and products and brief mention of actual percent % yield and theoretical yield, atom economy and formula mass determination (NOT using moles, but still based on the law of conservation of mass)

c) doc b click me!6b. Reacting masses, concentration of solution and volumetric titration calculations (NOT using moles) me!F + H

or (c) doc bF + H

(c) doc bclick me!7. Introducing moles: The connection between moles, mass and formula mass - the basis of reacting mole ratio calculations (relating reacting masses and formula mass)

also includes interpreting and deducing balanced chemical equations

Also extra more advanced Q's for Advanced Chemistry Students using the Avogadro Constant and with answers provided me!Honly 

or (c) doc bHonly

(c) doc bclick me!8. Using moles to calculate empirical formula and deduce molecular formula of a compound/molecule (starting with reacting masses or % composition) me!Honly

or (c) doc bHonly

(c) doc bclick me!9. Moles and the molar volume of a gas, Avogadro's Law me!Honly

or (c) doc bHonly

(c) doc bclick me!10. Reacting gas volume ratios, Avogadro's Law and Gay-Lussac's Law (ratio of gaseous reactants-products) me!Honly

or (c) doc bHonly

(c) doc bclick me!11. Molarity, volumes and solution concentrations (and diagrams of apparatus) me!Honly

or (c) doc bHonly

(c) doc bclick me!12. Volumetric titration calculations e.g. acid-alkali titrations (and diagrams of apparatus and descriptions of procedures)

See also Advanced level acid-base titration calculation questions

and Advanced level REDOX titration calculation questions me!Honly

or (c) doc bHonly

(c) doc bclick me!13. Electrolysis products calculations (negative cathode and positive anode products) me!Honly

or (c) doc bH only

(c) doc bclick me!14. Other miscellaneous calculations e.g. % purity, % percentage & theoretical yield, atom economy, volumetric titration apparatus, dilution of solutions (and diagrams of apparatus), water of crystallisation, quantity of reactants required

14.1 % purity of a product calculations

14.2a % reaction yield and theoretical yield calculations

14.2b atom economy calculations

14.3 dilution of solutions calculations

14.4 water of crystallisation calculations

14.5 how much of a reactant is needed?

14.5 calculation of quantities required and limiting quantity of a reactant

14. No Quiz written yet

(c) doc bclick me!15. Energy transfers in physical/chemical changes, activation energies and reaction profiles etc. (notes on a separate web page)

(c) doc bclick me!More enthalpy calculations explained for Advanced Level

Advanced A Level: Enthalpy Calculations with worked out answers

15.(c) doc bF + H

or (c) doc bHonly

(c) doc b 16. Gas calculations involving PVT relationship (Ideal Gas Equation) and determining molecular mass of a volatile liquid

only examples in notes

(c) doc bclick me!17 Radioactivity & half-life calculations including dating materials


(c) doc bclick me!18. Selection of 9 Advanced A Level Practical Exercises and Calculations involving Volumetric Analysis and Gravimetric Analysis

Advanced Level Calculations Only (but all the basics above)

(UK GCE-A-AS-A2 level, IB, US grades 11-12, AP honors students)

Ideal gas law P-V-T calculations

Acid-base and other non-redox titration questions

Redox volumetric titration questions

molecular equilibrium problem solving

partition and solubility product calculations

pH-pKa/b acid-base Q's and buffer calculations

Relative atomic mass calculations and Mass Spectrometer

All advanced level questions have worked out answers included.

Part 1 Introduction to chemical testing, analysing substances & line spectra

Part 2 Qualitative tests to identify organic molecule functional groups

Part 3 TESTS for cations (positive ions) and metal carbonates

Part 4 TESTS for gases, water and non–metallic elements

Part 5 TESTS for Anions (negative ions) including hydroxide (alkalis)

Note that qualitative chemical tests are all in another section

topCombined 'bumper' on-line Chemical Calculations Quizzes for KS4-GCSE-IGCSE

 The download may be slow without broadband

click me!click me! Basic GCSE/IGCSE Foundation Quiz on Ex. 2. to 6. (NO moles!)  (multiple choice)

click me!(c) doc b More advanced GCSE/IGCSE Higher Quiz/GCE-AS(basic) on Ex. 1. to 13. (lots of moles!)

click me!click me! Basic GCSE/IGCSE Foundation Quiz on Ex. 2. to 6. (NO moles!)  (type in answer)

click me!(c) doc b More advanced GCSE/IGCSE Higher Quiz/AS(basic) on Ex. 1. to 13. (lots of moles!)

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