Chm 139 Book notes Chapter 1•Periodic table: periodsare 7 horizontal rows, groupsare 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 nano10^-9 s pico10^-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 (degreeF-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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