ProblemSet232answers

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Jan 9, 2024

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Problem Set #02- units, density, temperature scales. Group #: ___________ Last Names: _________________________________________________ 1.) The unit system used by scientists, which is based on the metric system, is called the a) Metric system c) System Internationale (or International System) b) Scientific system d) System of a Down e) Social system 2.) The SI base unit for length is the: a) mile b) meter c) kilometer d) inch e) none of the above 3.) The SI base unit for mass is the: a) gram b) kilogram c) pound d) liter e) none of the above 4.) A chemist, trying to identify the pure substance in a record cleaner, finds that 25.00 cm 3 of the substance has a mass of 19.625 g at 20 °C. The following are the densities of the substances that may be the record cleaner: Substance Density in g/cm 3 at 20 °C chloroform 1.492 diethyl ether 0.714 ethanol 0.789 Isopropyl alcohol 0.785 toluene 0.867 Which of the substances above is it (circle the correct answer above)? 5.) The symbol for the SI base unit for mass is: a) g b) oz c) lb d) kg e) m/s 6.) The highest temperature ever recorded in the United States is 134 °F at Greenland Ranch, Death Valley, CA, on July 13, 1913. What is this temperature in Celsius degrees? a) 56.7 °C b) 62.2 °C c) 41.8 °C d) 45.6 °C 7.) What factor of 10 is associated with the prefix pico? a) 10 9 b) 10 6 c) 10 3 d) 10 -9 e) 10 -12

8.) The density of mercury, the only metal that is a liquid at room temperature, is 13.6 g/mL. Calculate the mass of 5.50 mL of the liquid. a) 2.47g b) 74.8 g c) 0.405 g d) 57.3 g 9.) What metric prefix is associated with the factor 10 -9 ? a) peta b) pico c) femto d) atto e ) nano 10.) Choose the appropriate factor of ten that completes the following equivalence: 1 mg = _____ g a) 10 2 b) 10 3 c) 10 -3 d) 10 -2 e) 10 -1 11.) What is smaller 100 mL or 0.1 L? a) 100 mL b) 0.1 L c) They are equal d) Not enough information to answer 12.) What is larger, 1 mL or 1 cL? a) 1 mL b) 1 cL c) They are equal d) Not enough information to answer. 13.) The density of ammonia gas under certain conditions is 0.625 g/L (note the units: g/L, not g /mL). What is the volume, in L, of a 5.00 g sample of this gas? a) 3.13 L b) 0.125 L c) 8.00 L d) 3.30 L 14.) Solder is an alloy made of tin and lead that is used in electronic circuits. A certain solder has a melting point of 224 °C. What is the melting point in degrees Fahrenheit? a) 435 °F b) 403 °F c) 124 °F d) 156 °F 15.) The temperature of interstellar space is 2.73 K. What is this temperature in °F ? a) -454 °F b) -270 °F c) -220 °F d) -154 °F e) -574 °F 16.) What is the temperature in Kelvin of 373 °C ? a) 100 °K b) 273 °K c) 0 °K d) 646 °K 17.) What is the greek letter symbol for micro, which is 10 -6 : a) β b) ψ c) μ d) ν e) α

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