Review Review Grade: «grade» Subject: Chemistry Date: «date» 1 Which of the following is not an SI base unit? A second (s) B kilogram (kg) C degrees Celsius (oC) D meter (m) E mole (mol) 2 Which of the following values is NOT equivalent to the others? A 500 m B 0.5 km C 5000 cm D 5 x 1011 nm E 500,000 mm 1 3 What is the correct representation of 702.0 g using scientific notation? A 7.02 x 103 g 1 B 70.20 x 10 g C 7.020 x 102 g D 70.20 x 102 g 4 Three students measured the length of a stamp whose accepted length is 2.71 cm. Based on the table, which statement is true? A Student 2 is both precise and accurate B Student 1 is more accurate than Student 3 C Student 2 is less precise than Student 1 D Student 3 is both precise and accurate 5 Chemists found that a complex reaction occurred in three steps. The first step takes 2.5731 x 102 s, the second step takes 3.60 x 10­1s, and the third step takes 7.482 x 101 s. What is the total amount of time for this reaction? A 3.68 x 101 s B 7.78 x 101 s C 1.37 x 101 s D 3.3249 x 102 s 6 How many significant figures are there in a distance measurement of 20.070 km? A 2 B 3 C 4 D 5 2 7 Which of these series of units is ordered from smallest to largest? A ug, cg, mg, kg B mm, dm, m, km C us, ns, cs, s D nL, mL, dL, cL 8 How many significant figures are there in a mass measurement of 0.07080 g? A 2 B 3 C 4 D 5 9 Which statement is correct? A The regular pepsi will float, diet pepsi will sink B The regular pepsi will sink, diet pepsi will float C Both cans will sink D Both cans will float 10 Find the density of an unknown metal bar with a mass of 57.3 g and a volume of 4.7 cm3. 11 The true value for a measurement is 24.36 m. The experimental value is 20.50 m. Calculate the percent error. 12 Perform this calculation to the appropriate number of significant figures. 13 Perform this calculation to the appropriate number of significant figures. 14 Perform this calculation to the appropriate number of significant figures. 3 Answers: C C C A D D B C B 12 15.8 225.8 32.4 0.100 4.