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Notecard Quiz Name ___________ Date _______ Period __ Activity 2, #2 Copy exactly what you have written in your notebook. Writing anything other than what is already written in your notebook will result in a score of zero.

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Warm up Glue study checkpoint into the warm up section of you notebook and complete it Put Unit A Major Concepts in the warm up section of your notebook after the study checkpoint After all notecards have been collected, compare your answers to the 4 square assignment

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Activity 9 Sources of Error Why werent the densities you calculated for the lt. gray cylinders all 2.7 g/cm 3 and the densities for the dark gray cylinders 7.9 g/cm 3 ? Reading ruler and graduated cylinder Drops escaping from graduated cylinder Calculation errors Rounding errors Lack of precision in the instruments Balance was not accurate

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Significant Figures Accuracy of Measurement What is the volume?

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Significant Figures Accuracy of Measurement Would it be accurate to say that the volume is 47.85? Why or why not?

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Significant Figures Accuracy of Measurement What is the volume?

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Significant Figures Accuracy of Measurement Would it be accurate to say that the volume is 36.5 ml? Why or why not?

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Significant Figures We want meaningful, accurate measurements… Whenever you do math with significant figures, the answer cant be more precise than the numbers it came from. http://www.mrbigler.com/Chem1-C1/topics/measurement/significant-figures.html

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Example- Density Calculation If you measure the mass of an object from a very accurate digital scale, it might read: 53.235 grams If you measure the volume in a graduated cylinder, your most accurate answer might be 45.2 ml

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Example – Density Calculation Density = mass / volume Density = 53.235 g / 45.2 mL You calculator will say this = 1.1777654867 But we can only use 3 significant digits because that is our least accurate measurement… Correct answer = 1.18 g/mL We will use 1.2 g/mL

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Activity 9, Number 3 Talk with people at your table to check your answers. Be ready to share answers to parts a,b,c

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Mr. Edmonds! Density of Irregular Objects song

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