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Quantitative Properties For Matter
08/27/15
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Reminders Quiz Monday You will use this information for tomorrow’s performance-based density lab
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Agenda Define density How to measure Significant figures
Scientific notation Accuracy vs precision *metric system*
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Wrap-Up: Density Formula? Definition?
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Wrap-Up: Density
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Wrap-Up: Density
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Agenda Define density How to measure Significant figures
Scientific notation Accuracy vs precision *metric system*
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How do you measure? We want the best measurement possible.
Electronic scale use all the digits given You read yourself use what’s given + estimated digit Glassware such as graduated cylinder, beaker, etc Measuring devices such as rulers, meter sticks, etc
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Estimated digit
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Estimated digit
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Estimated digit
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Agenda Define density How to measure Significant figures
Scientific notation Accuracy vs precision *metric system*
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Significant figures – the “important” numbers
Abbreviated as “sig figs” When should you round the final answer?
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Significant figures – the “important” numbers
The # of digits your final answer contains should be the same amount as the given with the lowest # of digits 5.5, 4.55, 5.5, 4, Only as strong as your weakest link
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Do you know your rounding rules?
0-4 rounds….. 5-9 rounds….
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Sig figs – rules! There are rules for which numbers are significant (not all #s are important!) Easiest way to remember: the Pacific/Atlantic rule
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PA rule – cross out all zeros depending on decimal
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Sig figs - practice What is the density of an object with a mass of 12.0 g and a volume of 3 mL? What is the density of an object with a mass of 12.0 g and a volume of 6.0 mL? What is the density of an object with a mass of 10.0 g and a volume of 0.50 mL? What is the density of an object with a mass of 0.5 g and a volume of 0.05 mL? What is the density of an object with a mass of g and a volume of 50.0 mL? What is the area of an object with a length of 50 cm and a width of 10 cm?
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Agenda Define density How to measure Significant figures
Scientific notation Accuracy vs precision *metric system*
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Scientific notation #.# x 10# Use exponents to replace digits
Start at decimal and move either forward or backward to get this formula: #.# x 10#
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#.# x 10# # the decimal is always moved to after this digit
# the number of these digits depends on how many sig figs you want # this represents how many times you moved the decimal over If you moved the decimal to the left, the digit should be negative (-) If you moved the decimal to the right, the digit should be positive (+)
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Scientific notation examples
Convert 3,000 to scientific notation using 2 sig figs Convert 3050 to scientific notation using 2 sig figs Convert 3040 to scientific notation using 2 sig figs Convert to scientific notation using 2 sig figs
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Scientific notation examples
Convert 3.45 x 102 to the decimal form using 2 sig figs Convert x 10-3 to the decimal form using 3 sig figs
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Agenda Define density How to measure Significant figures
Scientific notation Accuracy vs precision *metric system*
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Accuracy vs Precision Accuracy – how close your answer is to the true/accepted value (the answer) Precision – how close your answers are together
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Accepted value: 5.75 A B C 5.55 6.96 4.32 5.65 5.75 1.63 5.21 3.23
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Agenda Define density How to measure Significant figures
Scientific notation Accuracy vs precision *metric system*
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Metric System – largest to smallest
Kilo_________ Hecta ________ Deca ________ (Base) ________ Deci ________ Centi ________ Mili ________
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Metric System – largest to smallest
Kilo_________ Hecta ________ Deca ________ (Base) ________ Deci ________ Centi ________ Mili ________ King Henry Died By Drinking Chocolate Milk
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