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Warm Up Which substance is best classified as being malleable? a)lead plate b)chocolate chip cookie c)ceramic tile d)glass panel

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Chp 2 Activity 5 Investigation page 134 WDYT? Since a kilogram of feathers and a kilogram of lead have the same mass, how do they appear different and why?

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Investigation You Have 20 minutes to complete Part A: 1.Copy the following data table into Log Book Volume and Mass of Water Mass of Graduated Cylinder Volume of water (mL) Mass of graduated cylinder and water (g) Mass of water (g) Mass Volume (g/mL)

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Independent Work Checking Up Checking Up – Page 140 – Questions 1 - 4

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Chemistry In Activity Chem Saver Pages 7 Precision vs. Accuracy – Accuracymeasured – Accuracy refers to how close a measured value agrees with the correct value. – Precision – Precision refers to how closely individual measurements agree with each other. A precise measurement is one that we can make to a large number of decimal places.

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Beaker Graduated CylinderBurette Chemistry In Activity Chem Saver Pages 7

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The decimal point is present! Go to the Pacific Ocean and start walking across the United States until you hit a nonzero digit. After you hit the first nonzero digit, count all digits after that. These are all significant. 7 Significant Figures

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The decimal point is present! Go to the Pacific Ocean and start walking across the United States until you hit a nonzero digit. After you hit the first nonzero digit, count all digits after that. These are all significant. 3 Significant Figures

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The decimal point is absent! Go to the Atlantic Ocean and start walking across the United States until you hit a nonzero digit. After you hit the first nonzero digit, count all digits after that. These are all significant. 4 Significant Figures

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Significant Digits Significant Digits absentAtlantic – If Decimal absent Start from the Atlantic go to the first whole number count it and every number to the left = ______ PresentPacific – If decimal Present Start from the Pacific go to the first whole number count it and every number to the right = ______ Chemistry In Activity Chem Saver Pages 8 4 3

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Practice Counting Significant Figures Measurement m Kg 100,890 L 3.29x10 3 seconds cm 3,200,000 ml Significant Figures

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3.013 rounded to the hundredths is rounded to the hundredths is rounded to hundredths is 3.05

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Practice Rounding to 3 Significant Figures

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Chemistry In Activity Chem Saver Pages 8 MULTIPLYING and DIVIDING using Significant Figures So your answer can only have ________ Significant digits ________ Has the least number of significant Digits = ________ Example: x 3.10 x =

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Chemistry In Activity Chem Saver Pages 8 So must be rounded to _____ decimal place ADDING and SUBTRACTING using Significant Figures ________ Has the least number of decimal places = _________ Example: =

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Independent Work Accuracy & Precision Worksheet Accuracy & Precision Worksheet

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