1. Acid Deposition – the result of air pollutants combining with each other to produce acid precipitation or rainwater that has become acidic. Acid – pH lower than 7 Base – pH higher than 7 Neutral – pH of 7

2. What steps can be taken to control acid deposition?

3. Neutralization Reaction – acid + base  salt + water Acids are formed when molecules containing extra hydrogen ions (H+) are dissolved in water. Bases are formed when molecules containing extra hydroxide ions (OH-) are dissolved in water. The two combine to form HOH and H 2 O.

4. What is corrosion?

5. How is rusting prevented? 1.Painting – a protective coat which prevents oxygen and water from reaching the surface of the metal. 2.Galvanizing – process of applying a zinc coating to iron or steel. To do this the metal is immersed in a bath of molten zinc chich leaves a barrier between the metal and the environment. 3.Sacrificial metal – a second metal attached to the one that you don’t want to rust.

6. Relative Tendency to Corrode Magnesium Easy Aluminum Zinc Chromium Iron Nickel Tin Lead Brass Bronze Copper Stainless steel Silver Gold Hard