key-eng-fall07-q8059x01g6v - Many possibilities:...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
CHEM 2045C: Quiz 1 NAME _______KEY________________ N #_______________ Show your work for full credit Eng Q8059x01-gamma-6-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] 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.
Background image of page 1
This is the end of the preview. Sign up to access the rest of the document.

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 (its Kelvin) [b] meter [f] liter (a derived unit) [c] gram (its 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...
View Full Document

Ask a homework question - tutors are online