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CH. 2 Test Review

CH. 2 Test Review. Chemistry I. Object I. 1. Measure the mass of Object I. a . Record mass in grams. Use dimensional analysis to convert grams to kg. On your paper: a. grams_____ b. ______g_|_______ = ______kg |. Object I. 2 . Measure the volume of Object I.

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CH. 2 Test Review

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  1. CH. 2 Test Review Chemistry I

  2. Object I

  3. 1. Measure the mass of Object I. a. Record mass in grams. • Use dimensional analysis to convert grams to kg. • On your paper: a. grams_____ b. ______g_|_______ = ______kg |

  4. Object I

  5. 2. Measure the volume of Object I. • Record volume in cm3. • What is the volume of this object in mL? Hint: See your conversion chart. • On your paper: a. cm3_____ b. ______mL

  6. 3. Calculate the density of Object I. • Write the formula for density. • Use the measurements from the previous two questions (grams and mL) to find density. • On your paper: a. Density formula: D = b. Density of Object I = (Include units!)

  7. 4. Units of length: km, cm, mm, m a. Rank the units above in order from smallest to largest. ____, ____, _____, _____ b. Rank the units above in order from largest to smallest. ____, ____, _____, _____ c. Identify which unit is most appropriate for measuring: (1) football field ______, (2) a book____, (3) a truck_____ d. SI unit for length is_____.

  8. 5. Units of mass: kilogram, milligram, gram a. Rank the units above in order from smallest to largest. ____, ____, _____ b. Rank the units above in order from largest to smallest. ____, ____, _____ c. Identify which unit is most appropriate for measuring: (1) a football player ______, (2) a book____, (3) a medicinal pill_____ d. SI unit for mass is_____.

  9. 6. Metric Units • Two units for density: ___ and ____ • The prefix centi- means ______ • The prefix kilo- means ______ • The prefix milli- means_____

  10. 7. Scientific Method • The validity of scientific concepts is evaluated by testing ____________________. • If you think data is badly collected, it is OK to ignore that data. True or False?_____

  11. 8. Significant Figures a. The number of significant figures in 4 x 1023 is __. b. The number of significant figures in 0.00305 is ____. c. Four thousand thirteen expressed to ONE sig fig is _____.

  12. 9. Show dimensional analysis to solve. e. 0.25 g is equivalent to ______________ kg. f. 56 lb = _______ kg

  13. 10. Scientific Notation • When 6.02 x 1023 is multiplied by 9.1 x 10–31, the product is _____________. b. Write 0.0055 in scientific notation________ c. Write 6 550 000 in scientific notation________

  14. 11. Accuracy and Precision The data below correspond to the measurement of a marble with a known density of 3.2 g/mL by four individuals. Which observations are most precise? Which are most accurate? • Most precise______ • Most accurate________

  15. 12. Accuracy and Precision Examine the dart board. Are the darts on the dartboard accurate, precise, or both? Explain.

  16. 13. Mass = _____ = _____g The density of aluminum is 3.70 g/cm3. The volume of a solid piece of aluminum is 2.50 cm3. Find its mass. Hint: First write the formula from the density equation.

  17. 14. Quantitative vs. Qualitative Label each of the observations shown as qualitative or quantitative a. The solution is blue.____ • There are 125 mL in the flask.______ • The solution temperature is 45° C._____ d. The solution is translucent.

  18. 9. Accuracy and Precision Examine the dart board. Which darts are most precise? Which are most accurate? • Most precise______ • Most accurate________

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