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Chm 139 Chapter Notes pg.1 - Chm 139 Book notes Chapter 1...

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Chm 139 Book notes Chapter 1 Periodic table : periods are 7 horizontal rows, groups are 18 vertical columns. Elements in groups have similar chemical properties. Properties : intensive - does not depend on size of the sample eg. Melting pt or temp. extensive - does depend on size of sample eg. Volume, length SI units : mega 10^6m giga 10^9m. micro 10^-6 nano 10^-9 s pico 10^-12s Mass: measures the amt. of matter in an object . Weight: measures the pull of gravity on an object by the earth. 0 K (Kelvin absolute zero) = - 273.15 degrees Celcius and is the coldest possible temp. 273.15K = 0degrees Celsius. To get Temp in K = degrees + 273.15…to get temp in degrees= K-273.15 Celsius(C) to Fahrenheit : Tf= (9F/5C * C) +32F… Fahrenheit to Celsius : C= (5C/9F) x (degree F-32F) Density: the mass of an object divided by its volume Density=mass (g) /vol (ml or cm^3) accuracy- how close to the true value a given measurement is. Precision- how well a number of independent measurements agree with each other.
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