CHM 1045
Fall 1999
Dr. Michael Blaber

Name_________________________SS #__________________________

(Due in Recitation Tuesday Sep 7 1999)

1. Identify the following as either hypothesis, theory or fact (1 point)

• The Earth revolves around the Sun
• Elvis was abducted by aliens from the Andromeda galaxy
• Evolution occurs by survival of the fittest
• If enough nuclear bombs exploded, the Earth would plunge into a long cold winter

2. Identify whether the following involve physical or chemical changes (1 point)

• An outdoor barbecue starts to rust
• Wood is burned to produce soot
• Rock sugar crystallizes on a piece of string hung in a sugar solution
• The pressure of ice skates causes the ice underneath to melt

3. Are the following mixtures or pure substances? If they are mixtures, are they homogenous or heterogenous? (1 point)

• Coca Cola
• Cake mix
• Liquid Nitrogen
• Sand

4. What are the atomic symbols for the following metals (1 point)

• Tin
• Gold
• Silver
• Lead

5. In the following diagram, an electron is passing through the magnetic field and the electric field. Indicate the charge on the electrical plates if there is no net deflection of the electron (2 points)

6. Given the following information write the chemical symbols for each element (2 points)

7. Given the following ions or atoms, write the number of neutrons, electrons and protons (2 points)