Starter quiz
- What does Brownian motion describe?
- The motion of particles in a solid.
- The random motion of particles in a fluid. ✓
- The movement of particles in a pure substance.
- The method of separating mixtures.
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- Match the measurement unit to what it measures:
- grams (g)⇔mass ✓
- centimetres cubed (cm³)⇔volume ✓
- degrees Celsius (℃)⇔temperature ✓
- metres (m)⇔distance ✓
- What is a mixture?
- A combination of substances with fixed boiling points.
- A pure substance with no impurities.
- A combination of two or more substances that can be physically separated. ✓
- A liquid solution.
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- The term for a solid that dissolves in a solvent to form a solution is called a...
- 'solute' ✓
- What does the conservation of mass mean in the context of making a solution?
- The mass of the solution is always zero.
- The mass of solute and solvent equals the mass of the solution. ✓
- The mass of the solution is always more than its components.
- The mass of the solution changes with temperature.
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- When an insoluble solid is added to a liquid, a common observation is that the substance ______ to the bottom of the container over time.
- 'settles' ✓
Exit quiz
- In any investigation, the factor that is changed by the scientist is called the ______ variable.
- 'independent' ✓
- Put the steps in the correct order for investigating how temperature affects speed of dissolving (starting with adding the solvent to the beaker):
- 1⇔Add the solvent into the beaker.
- 2⇔Measure the temperature of the solvent.
- 3⇔Add the solute to the beaker.
- 4⇔Immediately start the timer.
- 5⇔Stir continuously to make a solution.
- 6⇔Stop the timer when the solute is fully dissolved (no longer visible).
- 7⇔Record results in a suitable table.
- Match the term to its definition:
- Dissolving⇔Process where solute particles spread throughout solvent. ✓
- Solubility⇔How well a solute is able to dissolve in a solvent. ✓
- Anomalous⇔Something that does not fit an obvious trend. ✓
- Table of results⇔An orderly way in which to record data. ✓
- Variable⇔Anything that can change in an investigation. ✓
- What is the purpose of stirring a solution in a solubility experiment?
- To increase the temperature of the solvent.
- To help the solute dissolve more uniformly. ✓
- To change the colour of the solution.
- To measure the volume of the solvent.
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- If the size of the solute pieces is decreased in a solubility experiment, the solute will dissolve...
- 'faster' ✓
- When a solute completely dissolves in a solvent, the resulting mixture is called a...
- 'solution' ✓
Worksheet
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Lesson Details
Key learning points
- The solubility of a substance could depend upon the size of the solute pieces, the choice or temperature of the solvent.
- The independent and dependent variables, and any measurements taken during an investigation, are recorded in a table.
Common misconception
Pupils regularly confuse the words 'table' and 'graph'.
Stress that a table of results holds measurements / observations (like a dinner table holds plates), while a graph is only on *graph* paper.
Keywords
Dissolving - The process in which a substance's particles separate and spread uniformly throughout the particles of a solvent, resulting in the substance no longer being seen.
Solubility - Solubility refers to how well a solute is able to dissolve in a solvent to create a solution.
Variable - A variable is anything that can change in an investigation.
Table of results - An orderly way in which to record data.
Anomalous - A result that does not fit an obvious trend.
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