1. 9/14/09 1. Which is a mixture? a.Liquid nitrogen in a tank b.Pure gold c.Ocean water d.Table salt (NaCl) 2. Which element in the table is listed first in the periodic table? a.Oxygen b.Carbon c.Gold d.Calcium Oxygen8 Carbon6 Gold79 Calcium70

2. 99/ 9 9/15/09 1. A molecule of hydrogen peroxide is shown. Which of the following shows the correct chemical formula for this molecule? a.HO b.HO 2 c.H 2 O 2 d.H 2 O 2. In which substance are molecules rigidly arranged? a.The water in a freezer at -2°C b.The water in a cup at 22°C (room temp) c.The water in a pot at 100°C d.The water in a steam engine at 110°C O O H H

3. 9/16/09 1. A state of matter in which a substance has a definite volume, but lacks a definite shape a.Solid b.Plasma c.Gas d.Liquid 2. When matter changes from a liquid to a gas this happens a.Freezing b.Condensation c.Melting d.Vaporization

4. 9/17/09 1. Many drain cleaners contain a substance called sodium hydroxide. Sodium hydroxide is formed when sodium, oxygen and hydrogen join chemically. How is sodium hydroxide classified? a.A solution b.A compound c.An element d.A mixture 2. What does the law of conservation of matter state? a.The total mass of the reactants is greater than the total mass of the product? b.The total mass of the reactants is less than the total mass of the products c.The total mass of the reactants equals the total mass of the products d.Matter can not change form

5. 9/18/09 1. A state of matter where there is not definite shape or no definite volume a.Liquid b.Solid c.Gas d.Melting 2. The diagram shows the entry for one of the elements in the periodic table. Based on the diagram an atom of Argon has a.18 protons b.18 neutrons c.40 protons d.40 electrons 18 Ar Argon 40.0

6. Answer Key 1. C/B 2. C/A 3. D/D 4. B/C 5. C/A