Acid Rain Presentation. If you were gone, watch it and copy the note in your notebook.

SCRUBBER Montana Coal Production Put day and Date Here Millions of Tons SCRUBBER

Look at the graph on the next slide Look at the graph on the next slide. Write down 2 quality level-2 questions about the graph. You do not need to answer them. NOTE: Level-2 questions often begin with the word “why”.

(Biomass)

So far in this unit. . . No need to write this page down in your notes. Structure and heating of atmosphere Ozone depletion issue Global warming/greenhouse issue NEXT: Acid Rain

ACID RAIN

How acidic? Distilled water: 7.0 Rain water: 5.6 (Why?) Write this down. Distilled water: 7.0 Rain water: 5.6 (Why?) Acid rain: as low as 4.2 (tea)

Problems caused by acid rain Lakes become acidic (dissolved metals) Tough on trees, animals, etc. Eats away at statues

Causes of acid rain 1. Burning coal that contains sulfur Write this down. Causes of acid rain 1. Burning coal that contains sulfur 2. Nitrous oxides from trains, planes, autos

Near Colstrip

CO2 SO2 Mercury

How do we “generate” electricity? The Grid No need to write this down. How do we “generate” electricity? The Grid

The recipe: SO2 + H2O > H2SO4 Write this down. The recipe: SO2 + H2O > H2SO4 Sulfur dioxide Cloud droplets Sulfuric acid

A regional problem

Solutions . . . Clean Air Acts of 1970 & 1990 Write this down. Burn “cleaner” coal Install “scrubbers” to remove sulfur dioxide Add “antacid” to lakes SCRUBBER

August 2009: The Stacks Come Down.

FIGURE 16.C

The END