Chapter 2: Measurement in Chemistry
Chapter 2: Measurement in Chemistry CHEM 103 - 02
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This 2 page Class Notes was uploaded by Vonshay Spence on Saturday October 3, 2015. The Class Notes belongs to CHEM 103 - 02 at University of North Carolina - Greensboro taught by Mrs. Mary Gerhard in Summer 2015. Since its upload, it has received 42 views. For similar materials see General Descriptive Chemistry I in Chemistry at University of North Carolina - Greensboro.
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Date Created: 10/03/15
Chapter 2 Measurements in Chemistry gt Measurement determination of the dimensions capacity quantity or extent of something gt Exact number number whose value has no uncertainty associated with it gt lnexact number number whose value has a degree of uncertainty associated with it estimated digit gt Mass Gram g Kilogram kg Milligram mg 0 1000 mg 1 g o 1000 g 1 kg English to Metric 1 inch 254 cm 3937 inches 1 meter 1 ounce 2835 g 1 pound 454 g 22 pounds 1 kilogram 1 quart 946 liter 106 quarts 1 liter gt Accuracy refers to the correctness of measurement data gt Precision refers to the reproducibility of measurement data law 31 mm gr hi t f a 5335 law by but 111 Wiai n high icxn law pm is ian tum Ell Keri Liar good ii ml Liter base unit of volume in the metric system Meter base unit of length in the metric system Gram base unit of mass in the metric system Mass measures of the total quantity of matter in an object Weight measure of the force exerted on an object by the pull of gravity Length 0 Meter m 0 Centimeter cm VVVVVV Millimeter mm Kilometer km 0 10 mm 1 cm 0 100 cm 1 m o 1000 m 1 km 0 1000 mm 1 m Rounding Off 4 or less drop 5 or more carryover Scienti c Notation 1 One number to the left of the decimal 2 Move decimal to the left to raise exponent 3 Move decimal to the right to lower exponent 4 To add or subtract exponents must be equal 5 Multiply add exponents Divide subtract exponents Signi cant gures measurement expression comprise of all digits that are known with certainty plus the 1St digit that is uncertain 1 Digits other than zero are always signi cant 2 Any nal zero or zeros used after the decimal point are signi cant 3 Zeros between two other signi cant digits are always signi cant 4 Zeros used solely for spacing the decimal point are not signi cant Density is the ratio of the mass of an object to the volume occupied by that object Density Massvolume Volume displacement the volume of a solid calculated from the volume of water displaced when it submerged Temperature Celsius59Fahrenheit32 CelsiusKelvin273 Kelvin Celsius273 Kelvin has do degree symbol