UNIT 2.2 SI UNITS/METRIC CONVERSIONS. SI UNITS SI = International system of metric units. Base unit = all other units are multiples of base units or combinations)

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SI UNITS & METRIC CONVERSIONS

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Presentation transcript:

UNIT 2.2 SI UNITS/METRIC CONVERSIONS

SI UNITS SI = International system of metric units. Base unit = all other units are multiples of base units or combinations) QuantityWritten unitSymbol length mass time amount of substance

SI UNITS 2. MULTIPLES OF BASE UNITS (p.17) PrefixSymbolExponential megaM10 6 kilok10 3 decid10 -1 centic10 -2 millim10 -3 microμ10 -6

2.2 SI UNITS 3. IMPORTANT EQUIVALENCES 1 mL = 1 cm 3 1 m 3 = 10 3 L 1 t = 10 3 kg

2.2 SI UNITS Example: Re-write the expression “6 kilograms” The prefix symbol for kilo is ___ The unit symbol for grams is ___ 6 kilograms = The exponential equivalent to kilo is ____ 6 kilograms =

METRIC CONVERSIONS Metric conversions involve using unit conversions between prefix symbols and exponential equivalents. Example: Write a conversion statement between cm and m.

M ETRIC CONVERSIONS Write conversion statements between each of the following dm and m cL and L dmol and mol

METRIC CONVERSIONS How many milligrams are in 5 kg? 5 kg = ? mg No direct link between kilo and milli What to do? Convert to a base unit first !

METRIC CONVERSIONS Express 7µm in Megametres 7µm =? Mm

M ETRIC CONVERSIONS How many decilitres in 0.5kL?

TRY GHz = ? kHz Hz is Hertz( a frequency unit)

M ULTI C ONVERSION Convert 1cg/ mL into dg/L

M ULTI C ONVERSION TRY: Convert 3 mg/L into µ g/mL T

METRIC CONVERSIONS DERIVED QUANTITIES Derived quantity = Derived unit =

D ENSITY Density is an example of a derived unit What is density? Density =

D ERIVED UNITS : DENSITY Given that a 2.44 cm 3 sample of an element has a mass of g. Determine the density of the element.

D ERIVED UNITS Find the volume of a block of wood that has a mass of 34.5 grams. The density of this wood is 12g/ cm 3

D ENSITY The density of carbon dioxide at standard temperature and pressure is 1.96 g/L. Calculate the mass of a 600 mL sample of carbon dioxide. The density of air is about 1.29 g/L at standard temperature and pressure. Would carbon dioxide tend to rise up or sink down in the atmosphere? _______________

Homework Hebden Page19 #13, 14, 15(a,c,d,f,g,i), Page 21 #16 (a,c,e) #17 (b,d,f,h,j,L,n) #18(a, b, c) Page 26 # 31,33, 37