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REVIEW_1-2 - REVIEW EXAM I A Multiple choice 1 A beaker...

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REVIEW – EXAM I A. Multiple choice 1. A beaker containing a clear liquid is cooled. A solid crystallizes out. The material in the beaker after cooling is A. a pure substance B. a heterogeneous mixture C. a homogeneous mixture D. a metalloid 2. 215 g KNO 3 , 0.35 g NaC and 500.0 g H 2 O are mixed at about 90 ˚ C to give 585.3 mL of solution. The density of this mixture is A. 1 g/mL B. 1.2 g/mL C. 1.22 g/mL D. 1.222 g/mL E. 2.221937 g/mL 3. has + 2 25 12 Mg A. 13p + 12n 13e - B. 12p + 13n 12e - C. 13p + 12n 11e - D. 12p + 13n 10e - E. 12p + 13n 23e - 4. The ions in group 16 have a charge of A. +1 B. +2 C. +6 D. -1 E. -2 5. A student wants to determine the density of unknown liquid. She weighs the pcynometer empty, filled with water, and filled with unknown liquid. She does the first two weighings with the on. For the last weighing, she forgets to put the stopper on. This oversight will cause her calculated density to be A. Greater than the true value. B. Smaller than the true value. C. The same as the true value.
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