Class notes
Atoms, Molecules, Info, and more ( 1st Semester)
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Includes everything from first few weeks in General Chemistry; from the atom to nomenclature.
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MEASUREMENTS AND SIGNIFICANT FIGURES : (Obj. 1)- All physical measurements must be as accurate as possible.
- No physical measurement is exact.
Uncertainty: - Due to limitation of instrument
- Skill.
Numbers obtained should indicate the size of the uncertainty.
- To express the maximum precision: All digits that are known accurately.
+ One digit that is doubtful. (Estimated)
= Significant figures (digits)
Length = (a quantity: number + unit)
0 1 2 3 4 5 cm
Known accurately
Sig. Figs
Doubtful
The doubtful digit is always the _______
Philippe Brunet, Vanier College Chemistry Department, A18
, - Precision varies with instrument precision
Length: ________
0 1 2 3 4 5 cm
Precision = Position of the doubtful digit
To find position of doubtful digit: Divide smallest division by two *
Smallest division = 0.1 cm
𝟎. 𝟏 𝐜𝐦
= 𝟎. 𝟎𝟓 𝐜𝐦 Doubtful digit at the second decimal place
𝟐
Measurement is precise to two decimal places
which results in 3 sig. figs.
* To be considered only when precision is not provided
Philippe Brunet, Vanier College Chemistry Department, A18
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