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Choosing a Method
Choose a separation method by the difference you can use: size, mass, density, magnetism, volatility, or solubility. Gold panning uses density: dense gold stays while lighter sand washes away. Famous gold rushes in the 1800s used that idea.
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Choosing a Method
What is it?
Choose a separation method by the difference you can use: size, mass, density, magnetism, volatility, or solubility. Gold panning uses density: dense gold stays while lighter sand washes away. Famous gold rushes in the 1800s used that idea.
In simple words
- Choose a separation method by the difference you can use: size, mass, density, magnetism, volatility, or solubility.
- Gold panning uses density: dense gold stays while lighter sand washes away.
- Ask what is different.
Important terms
size: Choose a separation method by the difference you can use: size, mass, density, magnetism, volatility, or solubility.
mass: Choose a separation method by the difference you can use: size, mass, density, magnetism, volatility, or solubility.
density: Choose a separation method by the difference you can use: size, mass, density, magnetism, volatility, or solubility.
magnetism: Choose a separation method by the difference you can use: size, mass, density, magnetism, volatility, or solubility.
volatility: Choose a separation method by the difference you can use: size, mass, density, magnetism, volatility, or solubility.
What you should learn
- State the main idea of choosing a method in clear words.
- Explain why choosing a method is useful in chemistry.
- Apply the correct method, observation, equation, or comparison.
- Avoid the common mistakes and write a complete exam answer.
Recommended for Class 9
Full school-level explanation
Choose a separation method by the difference you can use: size, mass, density, magnetism, volatility, or solubility. Gold panning uses density: dense gold stays while lighter sand washes away. Famous gold rushes in the 1800s used that idea.
WHAT — Core idea
Choose a separation method by the difference you can use: size, mass, density, magnetism, volatility, or solubility. Gold panning uses density: dense gold stays while lighter sand washes away. Famous gold rushes in the 1800s used that idea.
WHY — Why it matters
Ask what is different. If both parts are liquids that mix, filtration will fail. If one part is magnetic, a magnet is faster than a funnel. Gold panning is a density method from the 1800s gold rushes.
HOW — Method, evidence, or comparison
Particle size → Filtration → Sand from water; Density → Panning or a funnel → Gold from sand; oil from water; Magnetism → Magnet → Iron from sulfur; Solubility → Dissolve, then filter → Sugar from sand; Volatility → Evaporation or distillation → Salt from seawater; Colour / affinity → Chromatography → Dyes in ink
HOW — Answer in an exam
Ask what is different. If both parts are liquids that mix, filtration will fail. If one part is magnetic, a magnet is faster than a funnel. Gold panning is a density method from the 1800s gold rushes.
Remember
- size
- mass
- density
- magnetism
- volatility
- solubility
- Gold panning
- 1800s
Deeper understanding
Go beyond memorising Choosing a Method. Connect the definition to reasons, relationships, exceptions, and exam wording.
Common mistakes
Exam focus
WHAT
Key Points
HOW
Example
Exam focus
Quick revision
- size
- mass
- density
- magnetism
- size: Choose a separation method by the difference you can use: size, mass, density, magnetism, volatility
- mass: Choose a separation method by the difference you can use: size, mass, density, magnetism, volatility
Ask what is different. If both parts are liquids that mix, filtration will fail. If one part is magnetic, a magnet is faster than a funnel. Gold panning is a density method from the 1800s gold rushes.
For long answers on Choosing a Method: define clearly → explain the main parts → give one example → state one exam caution.
Exam Focus
Exam Focus
Important points
- size
- mass
- density
- magnetism
Important formulas
- size
- mass
- density
Common exam traps
- No separation method works for every mixture. First identify the useful difference.
- Filtration cannot separate two mixed liquids or a dissolved solute from its solvent.
Long question structure
Definition → key parts → example → exam caution
Common Mistakes
Common Mistakes
- Mistake
No separation method works for every mixture. First identify the useful difference.
- Mistake
Filtration cannot separate two mixed liquids or a dissolved solute from its solvent.
- Mistake
Ask what is different. If both parts are liquids that mix, filtration will fail. If one part is magnetic, a magnet is faster than a funnel. Gold panning is a de
Revision Zone
60-Second Revision
Quick cues from this topic — use them for last-minute revision.
size
mass
density
magnetism
Choose a separation method by the difference you can use: size, mass, density, magnetism, volatility, or solubility. Gold panning uses density: dense gold stays
- Definition
- Choose a separation method by the difference you can use: size, mass, density, magnetism, volatility, or solubility. Gold panning uses density: dense gold stays
- Critical warning
- No separation method works for every mixture. First identify the useful difference.
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Exam Practice
Define
Q1. Define Choosing a Method.
Explain
Q2. Explain: WHAT — Core idea.
Example
Q3. Give one clear example of Choosing a Method and say why it fits.
Mistake
Q4. State one common mistake students make about Choosing a Method.
Exam note
Q5. Write a short exam note on Choosing a Method: definition, two points, one example.
Sources & References
School-standard facts for Matric and Intermediate. Original explanations — not copied from textbooks.