Starter quiz
- Which of the following describes a solution?
- A mixture of two or more insoluble substances.
- A mixture where the solute is completely dissolved in the solvent. ✓
- A mixture where the solute particles are visible.
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- What is the main purpose of the evaporation process in water sample analysis?
- To change the colour of the liquid.
- To dissolve more solids into the solvent.
- To separate dissolved solids by converting the solvent into a gas. ✓
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- What is the term for a substance that dissolves in a solvent to form a solution?
- Mixture
- Solute ✓
- Solvent
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- Which apparatus is used to accurately measure the volume of a liquid?
- Balance
- Measuring cylinder ✓
- Ruler
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- Why is it important for solute particles to spread evenly throughout the solvent in a solution?
- To allow the solute to settle at the bottom.
- To ensure the solution is homogeneous and consistent. ✓
- To make the solute float on the surface.
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- What happens to the solute particles during the dissolution process?
- They react chemically with the solvent.
- They remain intact and visible.
- They separate and spread throughout the solvent particles. ✓
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Exit quiz
- What process is used to separate dissolved solids from a liquid?
- Decanting
- Evaporation ✓
- Filtration
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- How can you calculate the concentration of dissolved solids in a water sample?
- By adding the mass of dissolved solids to the volume of the water sample.
- By dividing the mass of dissolved solids by the volume of the water sample. ✓
- By multiplying the mass of dissolved solids by the volume of the water sample.
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- Why is it important to compare data from different water samples?
- To change the colour of the water.
- To draw conclusions about water quality. ✓
- To measure the temperature of the water.
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- What should you do after heating the water sample in the evaporation process?
- Add more water to the sample.
- Collect and record the mass of the remaining dissolved solids. ✓
- Measure the volume of the evaporated solvent.
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- A 30 cm³ water sample contained 0.20 g of dissolved solids. What mass of dissolved solids is in a 5 cm³ sample?
- 0.033 g ✓
- 0.10 g
- 0.50 g
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- Students heated 10 cm³ of a water sample in a 95.56 g evaporation dish, until dry. Which sample is pure water?
- Sample A = 95.56 g ✓
- Sample B = 95.58 g
- Sample C = 95.93 g
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Worksheet
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Presentation
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Video
Lesson Details
Key learning points
- Data can be analysed to assess the purity of water samples containing dissolved solids.
- Evaporation set-ups can be used to collect dissolved solids from a water sample.
Common misconception
All water is the same.
The dissolved solid content of water samples is affected by the environment from which it was obtained.
Keywords
Sample - A smaller portion of a larger quantity of a substance.
Dissolve - When a substance's particles separate and spread throughout the particles of a solvent resulting in it no longer being seen.
Analysis - Process of separating and quantifying the components of a sample to understand its nature and composition.
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