Experimental Techniques: Measurement

Experimental Techniques: Measurement

General Principles of Measurement

  • Understand that measurement in chemistry is crucial for accuracy and reliability.
  • Qualitative measurements describe qualities or characteristics (e.g. colour), while quantitative measurements provide numerical data (e.g. mass, volume).
  • Understand the importance of precision (consistent results) and accuracy (closeness to the true value).

Measurement Instruments

  • Recognise common instruments such as the Bunsen burner, test tubes, pipettes, and burettes.
  • Know the use and accuracy of measuring tools like balance (for mass), graduated cylinder (for liquid volume), and thermometer (for temperature).

Units and Conversion

  • Understand the SI units for common measurements: metres for length, kilograms for mass, seconds for time, Kelvin for temperature.
  • Be familiar with the conversion between different units, e.g. millilitres to litres.

Errors and Uncertainties in Measurement

  • Distinguish between random errors (unpredictable, can be minimised with repeated trials) and systematic errors (consistent, due to faulty equipment or method).
  • Understand significance of percentage error in measurements.

Scientific Notation and Significant Figures

  • Understand the use of scientific notation (also known as standard form) for handling very large or very small numbers.
  • Be familiar with significant figures and their implication in ensuring the precision of measurements.

Data Representation and Interpretation

  • Know how to tabulate data clearly and systematically.
  • Understand how to plot and interpret graphs from collected data.
  • Be able to identify trends and patterns in data.