Chemical Measurements Simplified Revision Notes for GCSE AQA Chemistry Combined Science

Revision notes with simplified explanations to understand Chemical Measurements quickly and effectively.

Learn about Measurement, Mass & Equations for your GCSE Chemistry Combined Science Exam. This Revision Note includes a summary of Measurement, Mass & Equations for easy recall in your Chemistry Combined Science exam

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3.1.4 Chemical Measurements

Chemical Measurements

Understanding Chemical Measurements:

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Whenever we measure something in chemistry, there's always a bit of uncertainty. This means that our measurement might not be exactly right, but we try to get as close as possible.

Why is There Uncertainty?

Precision of Instruments: The precision of the tool you're using to measure (like a ruler or a balance) affects how accurate your measurement is. More precise instruments have smaller units of measurement, making them more accurate.

Reducing Uncertainty:

To reduce uncertainty, scientists often take multiple measurements and calculate the average. This helps to get a more accurate result by balancing out any small errors in individual measurements.

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Example: If you measure 100 cm³ of water with a measuring cylinder, it might actually be 99.5 cm³ or 100.5 cm³, depending on how precise the cylinder is. If you take multiple measurements, you can average them to get a more accurate value.

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