CHEM 111 Chapter Notes - Chapter 2: Dimensional Analysis, Kilogram, Decimal Mark
4 Mar 2016
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Measurement- a quanitaive observaion which requires both a number and a unit. Scieniic notaion- a convenient way of expressing large and small numbers using powers of 10. Very large and small numbers can be represented compactly by using scieniic notaion. The number is represented as a decimal between 1 and 10 and is muliplied by 10 raised to the appropriate exponent. The sign on the exponent is determined by the direcion the decimal point is moved in the original number. Example: lets consider the number 2468: move the decimal point in the original number so that it is located ater the irst nonzero digit. 2468 2. 468 (decimal moves three places to the let: muliply this new number by 10 raised to the proper exponent. The proper exponent is equal to the number of places that the decimal point was moved. 2. 468 103: the sign on the exponent indicates the direcion the decimal was moved.
