Define and give an example of each of the following terms/concepts:
Law of Conservation of Mass: The law stating that in a chemical reaction, matter is neither
gained nor lost.
Ex. A burning piece of paper; It looks like mass sh
2009 SCORING GUIDELINES (Form B)
Water is essential to all living things.
(a) Discuss THREE properties of water.
(b) Explain each of the following in terms of the properties of water. You are not limited to the three
aka Bird Flu
-H1N5 (most pathogenic
Human with H1N5 & Symptoms
Epidemic? No. Pamdemic? Yes.
This virus has spread to many countries and
continents (especially Asia) around the
An ionic bond is a type of chemical bond formed through an electrostatic attraction between two
oppositely charged ions. Ionic bonds are formed between a cation, which is usually a metal, and
an anion, which is usually a nonmetal. Pure ionic bonding canno