Year 10 - Science
Concentration of solutions: using moles
Making salts
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This pupil-friendly study guide includes a unit summary, clear notes, common mistakes, and quick questions with answers.
Unit Summary
This unit explores empirical formulae, balanced chemical and ionic equations, gas identification, acid reactions, and pH as a measure of hydrogen ion concentration. It covers separation techniques and focuses on planning experiments, accurate measurements, safety, and communicating findings.
Lesson Summary
You will learn to explain what is meant by the concentration of a solution and calculate it for various solutions.
Key Notes
- Concentration of an aqueous solution is the mass of solute dissolved in 1 dm³ of distilled water, in g/dm³.
- The mass of one mole of solute is equal to the relative mass of the solute measured in grams.
- Concentration can be expressed in g/dm³ or mol/dm³.
- Equal volumes of solutions of the same concentration (in mol/dm³) have equal numbers of dissolved solute particles.
- Volume can be measured in various units; 1 dm³ is equivalent to 1000 cm³.
Vocabulary To Learn
- solution: Substance formed when a solute dissolves into a solvent.
- solute: A substance that has dissolved into a solvent.
- concentration: The amount of a solute dissolved in a certain volume of solvent.
- dilute: A low concentration of a solute in a solution.
- mole: 6.02 × 10²³ of something. The mass of a mole of a substance is its relative mass expressed in grams.
Common Mistakes To Avoid
- Pupils often confuse the chemical definitions for 'concentration' and 'strength'.
3 Quick Questions (With Answers)
1. Explain the scientific idea in this lesson using two key points.
Concentration of an aqueous solution is the mass of solute dissolved in 1 dm³ of distilled water, in g/dm³. The mass of one mole of solute is equal to the relative mass of the solute measured in grams.
2. Define this scientific word and use it in context. 'solution'
Substance formed when a solute dissolves into a solvent. Include the word in a full scientific explanation, not as a single label.
3. Correct this common scientific misunderstanding.
Mistake: Pupils often confuse the chemical definitions for 'concentration' and 'strength'. Correction: Stress that concentration is a measure of particles interspersed throughout a specific volume of liquid.
More Lessons In This Unit
- Acid-base reactions Study Guide
- Acid-base reactions (carbonates as bases) Study Guide
- Adapting a multistep chemical procedure for making a pure dry salt Study Guide
- Change in pH: practical Study Guide
- Chemical reactions of acids with metals and metal carbonates Study Guide
- Comparing concentration with strength Study Guide
- Concentration of solutions Study Guide
- Concentration of solutions: using moles (RAM 1 d.p.) Study Guide
- Describing salts Study Guide
- Hazard symbols and equipment Study Guide
- Ionic equations: salt formation Study Guide
- Making a pure dry sample of a soluble salt Study Guide
- pH scale and indicators Study Guide
- Solubility rules Study Guide
- Titrations: analytical technique Study Guide
- Titrations: calculating an unknown concentration Study Guide
- Titrations: calculating an unknown concentration (RAM 1 d.p.) Study Guide
- Titrations: making soluble salts Study Guide
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