CHEM 208 Lecture Notes - Lecture 2: Horse Length, Nonmetal, Decimal Mark
20 Sep 2016
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Step1: performing experiments experiment is a set of procedures made under controlled conditions to propose or test a hypothesis. Step 3: proposing a hypothesis (based on observations) hypothesis is a tentative explanation. Step 4: confirming the hypothesis (by repeated experiments) Scientific notation significant figures (digits) si system of units (based on the metric system. Rule 1: all non zero digits are significant figures. Rule 2: counting begins from the left with the first nonzero number. Rule 3: zeros between nonzero digits are counted as significant figures. Rule 4: terminal zeros (zeros to the right of a number)- these are always significant if the value contains a decimal point. Rule 1: in addition and subtraction of measured qty, the final answer contains the same number of decimal places as the one with the least of decimal places. Rule 2: in multiplication a division of measured qty, the final answer has the least number of significant figures. ex.
