AS Chemistry Formulae

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AS OCR A

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1
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Percentage uncertainty formula

<p></p><img src="https://knowt-user-attachments.s3.amazonaws.com/2ac3bb02-42f3-4631-bd83-ab39ea243674.png" data-width="100%" data-align="center"><p></p>
2
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Percentage error formula

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3
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Total percentage uncertainty method

Add up all uncertainties of individual apparatus

4
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Multiple readings uncertainty method

e.g. finding initial and final mass or temperature

  • DOUBLE the absolute uncertainty e.g. (2×±0.05)/25.00

<p>e.g. finding initial and final mass or temperature</p><ul><li><p><strong>DOUBLE</strong> the <u>absolute</u> uncertainty e.g. (<strong>2</strong>×±0.05)/25.00</p></li></ul><p></p><p></p>
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Dividing or multiplying measurements uncertainty method

e.g. finding rate of reaction (rate=vol/time)

  • add together percentage uncertainties

  • THEN calculate absolute uncertainty from sum of percentage uncertainties