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 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. ( HintKing 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 cars 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 doesnt have to be a 2)