Online Introductory Chemistry

Practice self test

	Answer any 4 questions. All questions have equal value. Allow 20 minutes.
1.	What are the three states of matter? Which one is the most organized? What is the state of matter depicted in the flask below? Sketch a picture of the least compact state showing 11 atoms in the same size container.
2.	Give the symbols for the following elements. Tell which is a metal and which is a nonmetal. symbol class (metal or nonmetal) carbon calcium potassium sodium
3.	Tell how a combination of sand, salt and iron filings can be separated.
4.	Explain why energy is not destroyed when a match is used to light a candle. What happens to the energy released in the flame?
5.	Why are there subscripts on the symbols for atoms in a chemical formula? What is the importance of the subscript 3 on the carbon atom in propane, C3H6?
6.	A pendulum is a common device. When the weight at the end of the pendulum is at the bottom of its swing it is moving faster than at any other point. What is the point in the swing when the weight is not moving at all? Which position matches the lowest kinetic energy and which is the highest?