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Chemistry, 7/e

Chemistry: The Study of Change

# Self Assessment A

 1 Which of the following is an example of a physical property? A) combustibility B) corrosiveness C) explosiveness D) density E) A and D 2 Which of the following represents the greatest mass? A) 2.0 x 103 mg B) 10.0 dg C) 0.0010 kg D) 1.0 x 106 μm E) 3.0 x 1012 pg 3 Convert 240 K and 468 K to the Celcius scale. A) 513 oC and 741 oC B) -59 oC and 351 oC C) -18.3 oC and 108 oC D) -33 oC and 195 oC 4 Calculate the volume occupied by 4.50 X 102 g of gold (density = 19.3 g/cm3). A) 23.3 cm3 B) 8.69 x 103 cm C) 19.3 cm3 D) 450 cm3 5 The melting point of bromine is -7 oC. What is this melting point expressed in oF? A) 45 oF B) -28 oF C) -13 oF D) 19 oF E) None of these is within 3 oF of the correct answer. 6 How many significant figures are there in the measurement 3.4080 g? A) 6 B) 5 C) 4 D) 3 E) 2 7 How many significant figures should you report as the sum of 8.3801 + 2.57? A) 3 B) 5 C) 7 D) 6 E) 4 8 Walking fast can consume 5.0 kcal per minute. How many hours of exercise are required to consume 450 kcal, the energy in a large candy bar? A) 7.5 hr B) 1.25 hr C) 1.75 hr D) 1.5 hr E) 1 hr 9 Together, Americans drive about 5.0 x 109 miles per day, and their cars get an average of 22 miles per gallon of gas used. For each kilogram of gasoline used, about 3 kg of carbon dioxide is produced. How many kilograms of CO2 are emitted into the atmosphere by cars in the US each day? [1 gal = 3.5 kg] A) 2 x 109 kg B) 2.4 x 109 kg C) 8.3 x 109 kg D) 1.6 x 109 kg E) None of the above. 10 A bar of gold is measured with the ruler shown. The length of the bar should be reported as: (1.0K) A) 3 cm. B) 3.0 cm. C) 2.7 cm. D) 2 cm.