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6.0Unit 6. Practical Skills in Chemistry II

Overview: Practical Skills in Chemistry II — IAL Edexcel Linear (Chemistry) Revision Notes & Topical Questions

5 min read 6 parts Lesson 1 of 14 Unit quiz

📚 IAL Edexcel Linear (Chemistry) Hub / Topical Revision
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Curriculum Equation Key قوانين الرقم الهيدروجيني والاتزان الأيوني - pH & Acid-Base Equilibrium FormulasFast Exam Solution
pH = -log[H⁺] | pOH = -log[OH⁻] | pH + pOH = 14 | [H⁺][OH⁻] = 10⁻¹⁴
Word Equation & Conditions: الرقم الهيدروجيني = -لوغاريتم تركيز أيون الهيدروجين | pH + pOH = 14
Location & Specifications: الاتزان الأيوني، كيمياء 3 ثانوي، التحصيلي، و AP Chemistry.
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Lesson summary

Unit 6 IAL Linear Chemistry revision notes.Read the meniscus at eye level.Concordant results show precision.Always add acid to water, not water to acid.Plan the method so only one variable changes.Identify the main sources of error and classify them as random or systematic.Say ho…

  • Unit 6 IAL Linear Chemistry: what to do next
  • Volumetric flask
  • Fume cupboard
  • Significant figures
  • Give / State / Name
  • Evaluate / Assess

Part 1 of 5Key ideas

Key ideas
Read the meniscus at eye level.
Concordant results show precision.
Always add acid to water, not water to acid.

Part 2 of 5Process & sequence

1
Plan the method so only one variable changes.
2
Identify the main sources of error and classify them as random or systematic.
3
Say how each would be reduced in practice.
4
Process the data, showing every step of the calculation.
5
Judge whether the conclusion is supported by the size of the uncertainty.
  • One variable
  • Classify the errors
  • Reduce them
  • Process the data
  • Judge the conclusion

Part 3 of 5Summary

Summary
Titrations use a burette.
Read the bottom of the meniscus.

Part 4 of 5Keep going

Unit 6 IAL Linear Chemistry: what to do next

These Unit 6 IAL Linear Chemistry notes covered the key ideas, worked examples and exam technique for this topic. Check your Unit 6 IAL Linear Chemistry understanding with the practice questions below, then reread any Unit 6 IAL Linear Chemistry point you were unsure about before moving on.

1
Previous lesson: 5.7 Organic Synthesis — Notes — IAL Chemistry Notes
2
Next lesson: 6.1 Advanced Physical Chemistry Core Practicals — Notes — IAL Chemistry Notes
3
Course: IAL Edexcel Linear (chemistry) — all units
4
Official syllabus: Pearson Edexcel International A Levels

Unit 6 IAL Linear Chemistry revision notes

Part 5 of 5Compare: Compare

Laboratory equipment
EquipmentUsePrecisionCommon errorSafetyExample
BuretteTitration±0.05 cm³Air bubble in tipClamp securelyAcid–base titration
PipetteTransfer fixed volume±0.06 cm³Not using fillerNever mouth pipette25.0 cm³ aliquot
Measuring cylinderApproximate volume±0.5 cm³Parallax—Adding reagent
BalanceMass±0.01 gNot zeroed—Weighing solid
ThermometerTemperature±0.5 °CTouching glassHandle carefullyEnthalpy experiment
Bunsen burnerHeating—Yellow flame dirtyTie hair back, gogglesHeating crucible

Key terms

Command terms

Command terms
Give / State / Name
Recall a fact; one idea per mark.
Define
Give the exact meaning using the specification keywords.
Describe
Give an account of what happens / the pattern in data, quoting values; no reasons needed.
Explain
Give reasons with linked statements (cause → effect). Each linked step is usually a separate marking point.
Suggest
Use knowledge in a new context; more than one answer may be accepted.
Compare
Similarities and differences; each point must refer to both items.
Calculate
Show working; include units; check significant figures. Method marks are given even if the final answer is wrong.
Discuss
Explore the issue from different angles and link the points.
Evaluate / Assess
Weigh strengths and weaknesses and reach a supported judgement.
Deduce
Draw a conclusion from the information given.
Justify
Support a statement/choice with evidence.

Exam technique

Keywords the mark scheme looks for in this lesson

Keywords the mark scheme looks for in this lesson
Burette · Pipette · Volumetric flask · Meniscus · Precision · Accuracy · Fume cupboard · Significant figures
Learn each definition in the Key words tab exactly; a missing keyword in a definition usually loses the mark.

How to get full marks (examiner guidance)

How to get full marks (examiner guidance)
Use specification keywords exactly (e.g. electronegativity, nucleophile, dynamic equilibrium, activation energy).
Link ideas
Link ideas for “explain” each marking point is usually a cause → consequence step; unlinked facts often score nothing.
Use the information in the question
“discuss/evaluate” answers must use the data provided and match the number of marks.
Convert units carefully (mg → g, cm³ → dm³) and show working for calculations.
Avoid vague words
“it”, “stuff”, “things”, “goes up”, “energy is made”. Name the substance and the process.
Do not extrapolate a graph line beyond the data or to zero unless asked.
Six-mark extended responses are marked on content AND a logical, linked line of reasoning.

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