Download - CP Chemistry Chapter 3
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CP ChemistryChapter 3
Test review
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Qualitative and quantitative measurements
• Ben is taller than Jerry
• Ben is taller than Jerry, who is 6’1”
• Ben is 6’3” tall
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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?
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Significant figures in measurements
• .00047• 74000• 7007• 74000.• 74.00• .007400• What are the rules for addition?• What are the rules for multiplication?
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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
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Scientific notation
• .000000747• 7470000000• 7.47• .0747
• Remember, when we make one side larger, we make the other side smaller
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Error and percent error
• What is error• What is percent error
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SI system
• The SI units for :
• Length• Mass• Time• Temperature
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Prefixes
• Milli• Kilo• Centi• Mega
• What is .05 centimeter in meters?
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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 liter1 kilogram
10 cm
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Weight vs mass
• Mass is a property of matter
• Weight is a consequence of mass and gravity and can depend on location
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Temperature
• Degrees centigrade• Kelvins
• Conversion ??
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Volume calculations
• Volume of rectangular solids• Volume of cylinders
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Density
• Formula for density?• How do we calculate mass?• What about volume?
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Specific gravity
• What is it?• What do we use it for?