Monday's Science Quiz
4.9- Acidification Lab (two gases lab included)
Acid Rain
1) carbon dioxide
2) sulfur dioxide
3) hydrogen chloride
(these create an acidic solution)
carbonic acid --> dissolved carbon dioxide
sulfur dioxide --> "acid rain" (kill forests and pollute water such as rivers and lakes)
--> volcanoes
--> industrial solution
Limestone/Sinkholes
-porous (hold water)
-soft
-soluble in water (carbonic acid)
Florida sinkholes occur because...
-lots of limestone
-water underground (aquafer)
-once covered with ocean --> soft calcium deposits (dead animals)
Sulfuric Acid
Uses:
-lead acid batteries (cars)
-fertilizers
-steel industry --> prevents rust corrosion
-dried fruit production (hydrotropic)
Two Gases Lab
-carbon dioxide is a dense gas that sinks
-in the upright test tube that is filled with carbon dioxide, the gas can't escape
-in the inverted test tube that is filled with air, the gas can escape
Magnesium and Acid:
-hydrogen is a light gas that rises
-in the upright test tube that is filled with air, gas can escape
-in the inverted test tube that is filled with hydrogen, the gas can't escape
The "Pop" Explained:
-gas is ignited and rushes out of test tube
-rubs against glass and causes friction (sound)
-flammable gas is escaping
Experimental Errors:
-not waiting 30 seconds
-unstopper before inverting
-break surface of water with test tube
-don't collect full test tube of gas
-air bubble in test tube
-stoppers not tight
-not keeping test tubes vertical
Acidification Lab
-the carbon dioxide turns to carbonic acid lowering the ph of the water
-calcium tablet is more soluble in cup with straw
-because the carbonic acid lowers ph and dissolves calcium faster
Experimental Errors:
-don't bubble water for long enough
-two cups don't have same amount of water
-lose water when using straw
-put carbon dioxide
Ocean Acidification
-ocean's ph has decreased about 0.1 ( about 25% down)
-lower ocean ph means sea animals with shells will not be able to make a shell (crabs,etc.)