Chemistry (9-1) - 0971 CIE

Experimental Design

Muhtasari

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.

Malengo

  1. 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.
  2. Suggest advantages and disadvantages of experimental methods and apparatus.
  3. 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.

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Maelezo ya Somo

Every numerical result in chemistry comes from a measurement, and every measurement comes from a choice of apparatus. Pick a measuring cylinder when you needed a pipette, and your titration is wrong before you start. Examiners test this practical judgement directly, and they also test whether you can use the standard vocabulary of solutions precisely.

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Tathmini ya Somo

Hongera kwa kukamilisha somo la Experimental Design. Sasa kwa kuwa umechunguza dhana na mawazo muhimu, ni wakati wa kuweka ujuzi wako kwa mtihani. Sehemu hii inatoa mazoezi mbalimbali maswali yaliyoundwa ili kuimarisha uelewaji wako na kukusaidia kupima ufahamu wako wa nyenzo.

Utakutana na mchanganyiko wa aina mbalimbali za maswali, ikiwemo maswali ya kuchagua jibu sahihi, maswali ya majibu mafupi, na maswali ya insha. Kila swali limebuniwa kwa umakini ili kupima vipengele tofauti vya maarifa yako na ujuzi wa kufikiri kwa makini.

Tumia sehemu hii ya tathmini kama fursa ya kuimarisha uelewa wako wa mada na kubaini maeneo yoyote ambapo unaweza kuhitaji kusoma zaidi. Usikatishwe tamaa na changamoto zozote utakazokutana nazo; badala yake, zitazame kama fursa za kukua na kuboresha.

  1. 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
  2. Which apparatus is most suitable for measuring the volume of a gas produced? A. Burette B. Balance C. Gas syringe D. Pipette Answer: C
  3. What is the substance that dissolves a solute called? A. Solution B. Solvent C. Filtrate D. Residue Answer: B
  4. What is the solid left on the filter paper after filtration called? A. Filtrate B. Solute C. Residue D. Solvent Answer: C
  5. 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

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Vitabu Vinavyopendekezwa

Cambridge IGCSE Chemistry Coursebook
Cambridge IGCSE Chemistry Coursebook
Manukuu: Fifth edition
Mchapishaji: Cambridge University Press
Mwaka: 2021
ISBN: 978-1-108-95160-9
Maelezo: Endorsed coursebook with full coverage of the 0620/0971 syllabus, worked examples and practical guidance.
Cambridge IGCSE Chemistry
Cambridge IGCSE Chemistry
Manukuu: Fourth edition
Mchapishaji: Hodder Education
Mwaka: 2021
ISBN: 978-1-398-31050-6
Maelezo: Endorsed textbook covering the Core and Supplement content with questions and practical work.

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