Chemistry Honors Midterm Review
Subject:
Chemistry [1]
Topic 1: Matter and Energy Scientific Notation M x 10n M= Mantissa (real number) n= exponent (integer, even +, -) Move decimal left, exponent is (+) number of spaces Move decimal right, exponent is (-) number of spaces Significant Figures Atlantic-Pacific Rule When a decimal is Present start on the PACIFIC Side (left side) with the first non-zero digit. All the following digits are significant 0.013=2 .00000000778=3 When a decimal is Absent start on the Atlantic side (right side) with the first non-zero digit. All the proceeding digits are significant. 387,000=3 400,300=4 The Mantissa of a number in scientific notation contains all the significant figures for a measurement 4.8x102=2 7.214x104=4 3.8000x106=5