CHEM 1101 Lecture 1: CHEM 1101 ch 1
3 Oct 2018
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What is matter? physical: change of phase chemical: rearrangement of atoms. Gas: no def volume and indefinite shape. **definitions to know by reading ch1 of book. Uncertainty: measurement devices are not that accurate, something falls between 2 lines on a ruler u have to guess the correct measurement. If zero is in middle of non zero numbers (3004), they are sig and this # has 4 sig figs. Zero at end of number and after decimal (148. 000) theyre significant 6 sig figs. If it appears at the beginning 0. 00404 kg, we do not count zeros as sig 3 sig **because u can convert to grams and it would be 4. 04 g. It shouldnt make a difference if u change units. Not 7. 01 or anything so we dont talk about sig figs here. No uncertainty, so infinite zeros after decimal. I kg = 1000 g = 10 ^3 g.
