Experimental Design
Overview
Good chemistry depends on good measurement. Choosing the right piece of apparatus, and using the right words to describe a mixture, is the difference between a reliable result and a meaningless one. These are the practical foundations that every other experiment in the course rests on.
In this lesson you will learn which apparatus to use for measuring time, temperature, mass and volume, how to weigh up the advantages and disadvantages of different methods, and the precise meanings of solvent, solute, solution, saturated solution, residue and filtrate. Getting this language exactly right earns easy marks throughout the exam.
Objectives
- Name appropriate apparatus for the measurement of time, temperature, mass and volume, including: (a) stop-watches (b) thermometers (c) balances (d) burettes (e) volumetric pipettes (f) measuring cylinders (g) gas syringes.
- Suggest advantages and disadvantages of experimental methods and apparatus.
- Describe a: (a) solvent as a substance that dissolves a solute (b) solute as a substance that is dissolved in a solvent (c) solution as a mixture of one or more solutes dissolved in a solvent (d) saturated solution as a solution containing the maximum concentration of a solute dissolved in the solvent at a specified temperature (e) residue as a substance that remains after evaporation, distillation, filtration or any similar process (f) filtrate as a liquid or solution that has passed through a filter.
Lesson Note
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Lesson Evaluation
Congratulations on completing the lesson on Experimental Design. Now that youve explored the key concepts and ideas, its time to put your knowledge to the test. This section offers a variety of practice questions designed to reinforce your understanding and help you gauge your grasp of the material.
You will encounter a mix of question types, including multiple-choice questions, short answer questions, and essay questions. Each question is thoughtfully crafted to assess different aspects of your knowledge and critical thinking skills.
Use this evaluation section as an opportunity to reinforce your understanding of the topic and to identify any areas where you may need additional study. Don't be discouraged by any challenges you encounter; instead, view them as opportunities for growth and improvement.
- Which apparatus is used to measure an accurate, variable volume of liquid in a titration? A. Measuring cylinder B. Burette C. Gas syringe D. Thermometer Answer: B
- Which apparatus is most suitable for measuring the volume of a gas produced? A. Burette B. Balance C. Gas syringe D. Pipette Answer: C
- What is the substance that dissolves a solute called? A. Solution B. Solvent C. Filtrate D. Residue Answer: B
- What is the solid left on the filter paper after filtration called? A. Filtrate B. Solute C. Residue D. Solvent Answer: C
- A saturated solution contains: A. No dissolved solute B. The maximum concentration of solute at a specified temperature C. Two immiscible liquids D. Only pure solvent Answer: B
Available on the Green Bridge App
Download the Green Bridge CBT app on your phone or computer to access full lesson notes, practice questions, and more.
Available on the Green Bridge App
Download the Green Bridge CBT app on your phone or computer to access full lesson notes, practice questions, and more.
Recommended Books
Practice Mock Questions
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