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Web Quiz 1

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Web Quiz You can login to this page multiple times but you cannot take the quiz more than once.. Submit your answer for grading by Clicking on the "Grade Answers" button at the bottom of the page only when you are sure of your answers. Question # 1 A method of separation that employs a system with two phases of matter, a mobile phase and a stationary phase, is called A. filtration. B. chromatography. C. distillation. D. vaporization. E. homogenization. Question # 2 In 1928, 1.0 g of a new element was isolated from 660 kg of the ore molybdenite. The percent by mass of this element in the ore was: A. 1.50% B. 6.60% C. 1.00% D. 1.5 x 10 -4 % E. 3.5 x 10 -3 % Question # 3 Convert 974036 mm to km. A. 9744036 km B. 974.036 km C. 974036000 km D. 0.000974036 km E. 0.974036 km

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Question # 4 The density of a liquid is determined by successively weighing 25, 50, 75, 100, and 125 mL of the liquid in a 250-mL beaker. If volume of liquid is plotted along the horizontal axis, and total mass of beaker plus liquid is plotted on the vertical axis: A. the x , or horizontal, intercept is the negative value of the weight of the beaker.
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