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quiz1_B_Key
Course: CHM 101, Fall 2009School: UNC Wilmington
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B CHM101-- Quiz #1 Name ____KEY____________________ Question #1 (4 points) Classify each of the following as a pure substance, homogeneous mixture or heterogeneous mixture. (a) air : homogeneous mixture (c) sugar : pure (b) propane gas : pure (d) tomato juice : heterogeneous mixture Question #2 (4 points) Classify each of the following as intensive or extensive property. (a) mass : Extensive (c) temperature :...
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B CHM101-- Quiz #1
Name ____KEY____________________
Question #1 (4 points) Classify each of the following as a pure substance, homogeneous mixture or heterogeneous mixture. (a) air : homogeneous mixture (c) sugar : pure (b) propane gas : pure (d) tomato juice : heterogeneous mixture
Question #2 (4 points) Classify each of the following as intensive or extensive property. (a) mass : Extensive (c) temperature : Intensive (b) melting point : Intensive (d) volume : Extensive
Question #3 (8 points) Answer the following questions about isotopes. (a) True or False questions : i) 29Si is heavier than 28Si. [TRUE] ii) 29Si and 28Si have different chemical properties. [FALSE] iii) 29Si and 28Si have the same number of electrons. [TRUE]
(b)
Naturally occurring silicon has the following isotopic abundance: 92.23% 28Si, 4.67% 29Si, 3.10% 30Si . Calculate the average atomic mass of silicon. Assume that the mass of each isotope (in amu) exactly is identical to its mass number [5 points].
Average mass = 0.9223 28 + 0.0467 29 + 0.0310 30 [3 points] = 28.1 (amu) [2 points] [ take off 1 point if the answer does not have 3 significant figures]
CHM101 -- B Quiz #1
Name ____________________________
Question #4 (2 points) Give the chemical name of each of the following compounds (a) Cl2O [dichloro monoxide] (b) LiOH [lithium hydroxide]
Question #5 (3 points) Predict the chemical formula for the ionic compound formed by
(a) (b) (c)
calcium ion and nitrate ion [Ca(NO3)2] sodium ion and ...
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