Chemistry

Worksheet 1 – Chapter 2   You must show your work for Credit   Part 1: Significant Figures Let’s start off with scientific notation… Large numbers (numbers for which the absolute value is greater than 1) will always have a positive exponent when in scientific notation.  When converting to scientific notation, you move the decimal point until there is a single digit to the left.  The number of places that the decimal spot moved becomes the exponent and the “x10”.   Example:  –450000 à –4.5x105.  The decimal point was moved 5 times to the left, so the exponent is 5. Example:  106709001 à 1.06709001x108. The decimal was moved to the left by 8 spots so the exponent is 8. Example:  57293.264 à 5.7293264x104 since the decimal was moved 4 times to the left.   Small numbers (numbers between 1 and –1) will always have a negative exponent when in scientific notation.  When converting to scientific notation, you move the decimal point until there is a single digit to the left.  The number of places that the decimal spot moved becomes the exponent and the “x10–”.                                   Example:  0.0003528 à 3.528x10–4.  The decimal moved 4 times to the right, so the exponent become –4. Example:  –0.0000000000000058500 à–5.8500x10–15.  The decimal point was moved 15 times to the right, so the exponent became &nda

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