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UNIT 2.2 SI UNITS/METRIC CONVERSIONS

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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

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SI UNITS 2. MULTIPLES OF BASE UNITS (p.17) ** Need to know this table Written PrefixSymbolExponential megaM10 6 kilok10 3 decid10 -1 centic10 -2 millim10 -3 microμ10 -6

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10 6 10 3 10 -1 10 -2 10 -3 10 -6

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

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2.2 SI UNITS Example: Re-write the expression “6 kilograms” using PREFIX and UNIT SYMBOLS an EXPONENTIAL EQUIVALENT The prefix symbol for kilo is ___ and the unit symbol for grams is ___ 6 kilograms = The exponential equivalent to kilo is ____ 6 kilograms =

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

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

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METRIC CONVERSIONS How many milligrams are in 5 kg?

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METRIC CONVERSIONS Express 7µm in Megametres

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M ETRIC CONVERSIONS How many decilitres in 0.5kL?

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

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METRIC CONVERSIONS DERIVED QUANTITIES Derived quantity = Derived unit =

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

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D ERIVED UNITS : DENSITY Given that a 2.44 cm 3 sample of an element has a mass of 47.14 g. Determine the density of the element.

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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

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ASSIGNMENT- DUE Tuesday 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) Finish ALL the questions on your 2 sheets: A-Measurement and the Metric System This is Homework for marks. Have this done by Tuesday. Show ALLLLL your calculations for every problem!

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