nde-ewo (pronounced enday aywo) Turn in your Density Lab in the basket by the calculator caddy Get a calculator Take out a sheet of notebook paper Express the following to the correct number of significant figures a) g g b)34.1 grams / 1.1 mL c)2.11 x 10 3 joules /34 sec d) km/ hrs e)1.45 mL – mL Thursday, September 13, 2012

Check Yourself g 2.31 g/mL 3.62 joules/sec km/hr mL

Graphing Graphing is an important tool for expressing data so that it is easier to read and interpret Rules for graphing: --place the manipulated/independent variable (the one that was changed) on the x axis. --place the dependent/responding variable (the results of that change) on the y axis. (dry mix) DRY MIX y scale = largest y value – smallest y valuex scale = largest x value – smallest x value # of lines on the y axis# of lines on the x axis The graph should cover at least ¾ of the grid

Rules: Each person will have their own paper. Answer must be written correctly on your paper Use appropriate units (where it applies)

Question #1 Roll the die then round to the correct number of significant figures in the following: a) b)

Question #2 Roll the die then round to the correct number of significant figures in the following: : a) b)

Question #3 Calculate. Express your answer in the proper # of significant figures. a) 1.44 m X m = b) 7082 ÷ 42 =

Question # 4 Calculate. Express your answer in the proper # of significant figures or decimal places. a) 7182 ÷ 52 = b) g – 36.2 g =

Question # 5 Express in standard scientific notation. a) b)

Question # 6 Express in normal notation. a)4.53 X 10 5 b)2.1 X 10 -4

Question #7 Draw the metric conversion grid. ( Hint…King Henry….)

Question # 8 Calculate density. Show all steps and units. mass 537 g, volume 1002 mL

Question #9 Calculate mass. Show all steps and units. density 7g/mL, volume 222 mL

Question # 10 Calculate volume. Show all steps and units. density 3 g/mL, mass 2100 g

Question # 11 What is the difference between accuracy and precision?

Question #12 Tell if the following data is accurate, precise, both or neither. A nail has a length of 3.04 cm. Measurements recorded were: 2.01, 2.02, 2.01, 2.03

Question #13 Give the appropriate unit to measure the following: a)The weight of a minivan b) The volume of gas in a car’s tank

Question #14 Give the appropriate unit to measure the following: a)The length of a bar of soap b)The volume of a tube of toothpaste

Question # 15 Answer the following questions: a)How many decigrams are in a hectogram? b)How many centimeters are in a kilometer?

Question # 16 The lines in the picture just touch the rim of the penny. Record the diameter of the penny in centimeters, recording the correct number of significant figures.

Answers

Question # 1 You rolled a… Your answer should be a) b) You rolled a… Your answer should be x x

Question # 2 You rolled a… Your answer should be x x x x a) b) You rolled a… Your answer should be x x

Question #3 a)3.55 m b)170

Question #4 a)140 b)19.3

Question #5 a)3.82 x b)4.563 x 10 6

Question #6 a)45300 b)

Question #7 k hda BASEdcm kilohectodekadecicentimilli

Question #8 D = m/V = 537 g/1002 mL= g/mL

Question #9 M = DV = (7 g/mL)(222 mL) = 2000 g

Question #10 V = m/D = 2100 g/ (3 g/mL) = 700 mL

Question #11 Accuracy: how close values are to the known (true) value Precision: how close values are together

Question #12 Precise

Question #13 a)kg b)L

Question #14 a)cm b)mL

Question #15 a)1000 or 10 3 b) or 10 5

Question # cm (make sure your answer has a 100ths place value; it doesn’t have to be a 2)