key-eng-fall07-q8059x01o6w

key-eng-fall07-q8059x01o6w - Many possibilities...

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CHEM 2045C: Quiz 1 NAME ________KEY_______________ N #_______________ Show your work for full credit Eng Q8059x01-omega-6-w 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] iron pure substance [b] chicken fried rice 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 physical properties from above, and describe those properties as intensive or extensive properties.
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Unformatted text preview: Many possibilities: Reddish-brown, melts at 14 °C, density is 0.897 g/cm 3 , poor conductor of electricity, etc. In this example all of the physical properties were intensive. 3. (3 pts) Which of the following are NOT SI base units? [a] Kelvin [e] Celsius (it’s Kelvin) [b] meter [f] liter (a derived unit) [c] gram (it’s kilogram) [g] second [d] kilogram [h] mole 4. (3 pts) Give the number of significant figures for each number. [a] 8.2 Gs [b] 0.000034250 cm [c] 1.702 × 10 3 kL 2 sig figs 5 sig figs 4 sig figs 5. (4 pts) One thousand milligrams (mg) equal one gram (g). Ten decigrams (dg) equal one gram (g). How many mg are in 143.2 dg? 1432 1 10 1000 1 14320 . dg g dg mg g mg × × = 6. (1 pt) What element has the chemical symbol O? Oxygen...
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