key-eng-fall07-q8059x01o1v - Physical(many possibilities...

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CHEM 2045C: Quiz 1 NAME _________KEY______________ N #_______________ Show your work for full credit Eng Q8059x01-omega-1-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] magnesium pure substance [b] vomit heterogeneous mixture 2. (2 pts) In the process of attempting to characterize a substance, a chemist makes the following observations: The substance is a reddish-brown liquid. It melts at 14 °C and boils at 104 °C. Its density at 20 °C is 0.897 g/cm 3 . The substance burns air. It reacts with chlorine to give a yellow liquid. It is a poor conductor of electricity. Identify two properties from above: one physical and one chemical.
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Unformatted text preview: Physical (many possibilities): reddish-brown, melts at 14 °C, density is 0.897 g/cm 3 , poor conductor, etc. Chemical (two possibilities): burns air, reacts with chlorine. 3. (3 pts) Which of the following are NOT SI base units? [a] Kelvin [e] Celsius (it’s Kelvin) [b] meter [f] liter (derived units) [c] gram (it’s kilogram) [g] second [d] kilogram [h] mole 4. (3 pts) Give the number of significant figures for each number. [a] 1.3004 × 10 2 dg [b] 4.0 cL [c] 0.0003024 km 5 sig figs 2 sig figs 4 sig figs 5. (4 pts) One hundred centileters (cL) equal one liter (L). Ten deciliters (dL) equal one Liter (L). How many dL are in 3.04 cL? 304 1 100 10 1 0 304 . . cL L cL dL L dL × × = 6. (1 pt) What element has the chemical symbol O? Oxygen...
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