Chemical Calculations topic check · G3 Pure and O-Level Chemistry
Check what you know about G3 Pure Chemistry Chemical Calculations, practise what needs work, then check your progress and come back for a later review.
Learning objectives
- state the symbols of the elements and formulae of the compounds mentioned in the syllabus
- deduce the formulae of simple compounds from the relative numbers of atoms present and vice versa
- deduce the formulae of ionic compounds from the charges on the ions present and vice versa
- interpret chemical equations with state symbols
- construct chemical equations, with state symbols, including ionic equations.
- define relative atomic mass, Ar
- define relative molecular mass, Mr, and calculate relative molecular mass (and relative formula mass) as the sum of relative atomic masses
- define the term mole in terms of the Avogadro constant
- calculate the percentage mass of an element in a compound when given appropriate information
- calculate empirical and molecular formulae from relevant data
- calculate stoichiometric reacting masses and volumes of gases (one mole of gas occupies 24 dm3 at room temperature and pressure); calculations involving the idea of limiting reactants may be set (knowledge of the gas laws and the calculations of gaseous volumes at different temperatures and pressures are not required)
- apply the concept of solution concentration (in mol/dm3 or g/dm3) to process the results of volumetric experiments (e.g. titration) and to solve simple problems (appropriate guidance will be provided where unfamiliar reactions are involved)
- calculate % yield and % purity.
Your next step
Check what I know
Start with a check of what you already know. Answer each question and say how sure you are. We'll use this to suggest what to practise next.
Finding your next step…
Check what I know
Start here to see which parts you already know.
About 8 minutes
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Answer 9 short questions. It shows what to work on next and doesn't count towards course progress.
Getting your questions…
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Beyond the syllabus: optional enrichment that does not count towards your progress.
Practise
Work through questions with marking and feedback as you learn.
About 10 minutes
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Questions are picked at random each time you start. You'll see the answer after each question. It's for practice only and doesn't count towards course progress.
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Recent attempts
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No completed attempts are saved yet.
Beyond the syllabus: optional enrichment that does not count towards your progress.
Practise after feedback
After a check, practise the skills it showed you need to work on.
About 10 minutes
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Questions are picked at random each time you start. You'll see the answer after each question. It's for practice only and doesn't count towards course progress.
Getting your questions…
Recent attempts
History is stored only in this browser.
No completed attempts are saved yet.
Beyond the syllabus: optional enrichment that does not count towards your progress.
Check my progress
When you feel ready, answer on your own to show what you can do.
About 10 minutes
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Answer 11 questions. You'll see your score, the answers and explanations at the end. Your result can count towards your course progress.
Getting your questions…
Recent attempts
History is stored only in this browser.
No completed attempts are saved yet.
Beyond the syllabus: optional enrichment that does not count towards your progress.
Check again
After practising what your progress check showed, check those skills again.
About 10 minutes
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Time is up, but your answers have not been submitted yet. Check your connection and try again.
Answer 11 questions. You'll see your score, the answers and explanations at the end. Your result can count towards your course progress.
Getting your questions…
Recent attempts
History is stored only in this browser.
No completed attempts are saved yet.
Beyond the syllabus: optional enrichment that does not count towards your progress.
Review
Come back later to see whether your learning has lasted.
About 10 minutes
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Answer 11 questions. You'll see your score, the answers and explanations at the end. A scheduled review counts towards your course progress only when it is due.
Getting your questions…
Recent attempts
History is stored only in this browser.
No completed attempts are saved yet.
Beyond the syllabus: optional enrichment that does not count towards your progress.
Practise: multiple-choice
Work through questions with marking and feedback as you learn.
About 10 minutes
Checking question availability…
Time is up, but your answers have not been submitted yet. Check your connection and try again.
Questions are picked at random each time you start. You'll see the answer after each question. It's for practice only and doesn't count towards course progress.
Getting your questions…
Recent attempts
History is stored only in this browser.
No completed attempts are saved yet.
Beyond the syllabus: optional enrichment that does not count towards your progress.
Practise: written
Work through questions with marking and feedback as you learn.
About 10 minutes
Checking question availability…
Time is up, but your answers have not been submitted yet. Check your connection and try again.
Questions are picked at random each time you start. You'll see the answer after each question. It's for practice only and doesn't count towards course progress.
Getting your questions…
Recent attempts
History is stored only in this browser.
No completed attempts are saved yet.
Beyond the syllabus: optional enrichment that does not count towards your progress.
Next step