CHE 2A Lecture Notes - Lecture 3: Significant Figures, Molar Mass, Covalent Bond
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CHE 2A Full Course Notes
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Zeros appearing between nonzero digits are significant. Zeros appearing in front of nonzero digits are not significant. Zeros at the end of a number and to the right of a decimal are significant. Zeros at the end of a number may or may not be significant, depending if there is. Addition/subtraction: as precise as the least precise measurement to the right of the decimal ex) 12. 18701 (5 numbers to the right of decimal) + 0. 0673 (4 numbers to the right of decimal) least amount. Multiplication/division: as precise as the least precise measurement ex) 12. 257 (5 sig figs) x 1. 162 (4 sig figs) least amount. Tip: don"t apply significant figures until the end of a problem. Molecular compounds: involve shared electrons (among nonmetals) and consist of electrically neutral, discrete particles (molecules: covalent bonding- electrons shared between atoms, hydrogen and oxygen, h2o, molecular compounds can have either empirical or molecular formula, molecular weight.
