Summary
Summary Chemistry errors and uncertainty
- Module
- CH6 - A2 Practical Chemistry
- Institution
- WJEC
Everything you need to know about significant figures and percentage errors when facing exam questions.
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Uncertaintiesany piece of apparatus uncertainty is taken as one half of the
smallest divisions on the apparatus
e's burette with scale marks
of d1cm uncertainty is 0.05cm
unless the question directly thevalue with t
copythevalue
gives directly
ifuse two ridings Ewirisitiniteasiremene combine the uncertainties
e.g final initial value sum errors up
for I measurement if digital
0.8 error isto 1
Percentage
error it non digital 0.8 error is10.05
error
difference
x2
reading
X 100
Significant figures
take the least number of significant figures in the question
always use significant figures and not decimal places when considering errors
noteC pH usually take 2 d maydeducemarks
p
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