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1.5Structure of Matter

Nuclear chemistry — EST 2 Chemistry Revision Notes & Topical Questions

5 min read 8 parts Lesson 5 of 5 1 quiz

📚 EST 2 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

Nuclear chemistry EST Chemistry notes: Write balanced nuclear equations.Alpha decay lowers A by 4 and Z by 2.Beta decay raises Z by 1; A stays the same.After n half-lives, (½)n of the sample remains.Carbon-14 dating uses a half-life of about 5730 years.Fusion powers the Sun; fiss…

  • Band of stability
  • A 80 g sample has a half-life of 3 days. How much remains after 9 days?
  • Nuclear chemistry EST Chemistry: what to do next
  • Radioactivity
  • Alpha particle
  • Beta particle

Section 1 of 8Nuclear chemistry

Band of stability
Band of stability neutron-to-proton ratio determines stability.
Chain reactions need a critical mass.
Radioisotopes are used in medicine and dating.
Nuclear reactions release far more energy than chemical ones.
Mass defect is converted to energy by E = mc².

Section 2 of 8Process & sequence

1
Write the parent nucleus.
2
Add the emitted particle on the product side.
3
Balance mass numbers (top).
4
Balance atomic numbers (bottom).
5
Identify the daughter element from Z.

Balancing a nuclear equationwrite these steps in this order; each step is a marking point.

  1. Parent nucleus
  2. Add emitted particle
  3. Balance A
  4. Balance Z
  5. Name daughter

Section 3 of 8Compare

Types of radiation
TypeSymbolChargePenetrationStopped by
Alpha42He+2LowPaper
Beta0−1e−1MediumAluminium
Gammaγ0HighThick lead
Positron0+1e+1MediumAluminium

Section 4 of 8Worked examples

  1. A 80 g sample has a half-life of 3 days. How much remains after 9 days?

Section 5 of 8Keep going

Nuclear chemistry EST Chemistry: what to do next

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

1
Practice: Nuclear chemistry EST Chemistry practice questions
2
Previous lesson: 1.4 Molecular Geometry & Intermolecular Forces — EST II Notes
3
Next lesson: 2.1 Gases
4
Course: EST 2 Chemistry — all units
5
Official syllabus: OpenStax free science textbooks

Nuclear chemistry EST Chemistry revision notes

Section 6 of 8Key terms

Section 7 of 8Command terms

Command terms
Identify / Describe (FRQ)
A short, specific statement; describing requires relevant characteristics, not a single word.
Explain / Justify (FRQ)
Give the cause-and-effect reasoning or evidence; a restated fact does not score.
Calculate
Show setup, substitution and the answer with units.
Predict
State the expected outcome; add a reason only if asked to justify.
MCQ technique
Read every option; eliminate distractors that are true statements but do not answer the question; watch for NOT/EXCEPT.

Section 8 of 8Exam technique

Keywords the mark scheme looks for in this lesson

Keywords the mark scheme looks for in this lesson
Radioactivity · Alpha particle · Beta particle · Gamma ray · Half-life · Fission · Fusion
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)

1
Answer exactly what is asked; extra correct material does not earn credit, and contradictory statements can cancel credit (AP FRQ).
2
Use precise vocabulary (e.g. “active site”, “concentration gradient”, “allele”), never “it/stuff/things”.
3
Show units and working in calculations.
4
In MCQs, predict the answer before reading the options, then eliminate.

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