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CP Chemistry Chapter 3. Test review. Qualitative and quantitative measurements. Ben is taller than Jerry Ben is taller than Jerry, who is 6’1” Ben is 6’3” tall. Accuracy and precision. What do a group of numbers look like which are precise but not accurate?
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CP ChemistryChapter 3 Test review
Qualitative and quantitative measurements • Ben is taller than Jerry • Ben is taller than Jerry, who is 6’1” • Ben is 6’3” tall
Accuracy and precision • What do a group of numbers look like which are precise but not accurate? • If a group of numbers are accurate, are they precise?
Significant figures in measurements • .00047 • 74000 • 7007 • 74000. • 74.00 • .007400 • What are the rules for addition? • What are the rules for multiplication?
Rounding • .00753 3 sig figs • .00753 2 sig figs • .00753 1 sig fig • Remember that we round in order to observe the significant figures in calculations!! • Do the calculation, then round the number
Scientific notation • .000000747 • 7470000000 • 7.47 • .0747 • Remember, when we make one side larger, we make the other side smaller
Error and percent error • What is error • What is percent error
SI system • The SI units for : • Length • Mass • Time • Temperature
Prefixes • Milli • Kilo • Centi • Mega • What is .05 centimeter in meters?
Liters and cubic centimeters • What is 1 milliliter? • What is the mass of a liter of water? • 1 liter of water is 1 kilogram • 1 cm3 = 1 g of water (@4°C) 1 liter 1 kilogram 10 cm
Weight vs mass • Mass is a property of matter • Weight is a consequence of mass and gravity and can depend on location
Temperature • Degrees centigrade • Kelvins • Conversion ??
Volume calculations • Volume of rectangular solids • Volume of cylinders
Density • Formula for density? • How do we calculate mass? • What about volume?
Specific gravity • What is it? • What do we use it for?