key-eng-fall07-q8059x01b5v - Many possibilities for...

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CHEM 2045C: Quiz 1 NAME ______KEY________________ N #_______________ Show your work for full credit Eng Q8059x01-beta-5-v NOTE: for multiple choice answers, there may be more than one answer. 1. (2 pts) Classify each of the following as a pure substance or a mixture. IF a mixture, indicate whether it is homogeneous or heterogeneous: [a] Italian salad dressing heterogeneous mixture [b] liquid mercury pure substance 2. (2 pts) In the process of attempting to characterize a substance, a chemist makes the following observations: The substance is a green solid. It melts at 1034 °C and boils at 1542 °C. Its density at 20 °C is 2.23 g/cm 3 . The substance does not react in air at 20 °C. It reacts with fluorine gas to give a brittle yellow solid. It is a poor conductor of electricity. Identify two physical properties from above, and describe those properties as intensive or extensive properties.
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Unformatted text preview: Many possibilities for physical properties: Green, melts at 1034 C, density is 2.23 g/cm 3 , poor conductor, etc. In this example, all the properties were intensive. 3. (3 pts) Which of the following are NOT SI base units? [a] meter [e] second [b] Celsius (its Kelvin) [f] liter (derived units) [c] Kelvin [g] mole [d] kilogram [h] gram (its kilogram) 4. (3 pts) Give the number of significant figures for each number. [a] 1.70 10 3 mL [b] 0.003234 ms [c] 2.3247 mol 3 sig figs 4 sig figs 5 sig figs 5. (4 pts) One thousand seconds (s) equal one kilosecond (ks). Ten deciseconds (ds) equal one second (s). How many ds are in 0.03212 ks? 003212 1000 1 10 1 3212 . . ks s ks ds s ds = 6. (1 pt) What element has the chemical symbol C? Carbon...
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This note was uploaded on 07/10/2011 for the course CHM 2045 taught by Professor Eng during the Fall '10 term at UNF.

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