Science Study Guide IPS Period 5

study for monday's test

4.9: Acid Rain and Global Warming

  • Gases dissolve in our atmosphere
  • Carbon Dioxide, Sulfur dioxide and hydrogen chloride create acidic solutions
  • Carbonic acid: Dissolved Carbon Dioxide
  • Sulfur Dioxide: Acid Rain (kills forests, pollutes water)

Limestones/Sinkholes

  • Limestone: Porous, holds water, soft and soluble
  • Florida sinkholes occur because of lots of limes one, there is water underground and florida was once covered with ocean (soft calcium deposits)

Sulfuric Acid

  • It was discovered in 8th century by Alchemists.
  • Its uses include: Lead Acid batteries, fertilizers, prevents rust corrosion (steel industry) and dried fruit production.

Two Gases Lab

Purpose: To collect and compare the gases produced by the reaction of sulfuric acid with both pure magnesium and magnesium carbonate.



  • Magnesium&Acid = Hydrogen. The upright test tube, gas escapes and it is filled with air. The inverted test tube, the gas cannot escape and it is filled with hydrogen.
  • The flammable gas is escaping and there is a pop sound because the gas is ignited and rushes out of test tube. The Rubbing against the glass causes friction (sound)



Errors:


  • Not waiting 30 seconds
  • Unstopper before inverting
  • Break surface water with test tube
  • Don't collect full test tube of gas
  • Air bubble in test tube
  • Stopper is not tight
  • Not keeping test tube vertical



Magnesium Carbonate &Acid


  • The dense gas sinks.
  • In the upright test tube, it is filled with carbon dioxide and the gas cannot escape.
  • In the inverted one, it is filled with air and gas escapes.

Acidification of Water Lab

Purpose: To determine if we can change the acidity of water by dissolving carbon dioxide from our lungs.


  • Phenol red changes color as you add carbon dioxide in water
  • The carbon dioxide turns to carbonic acid lowering the pH of the water
  • Calcium tablet is more soluble than cup with straw
  • The carbonic acid lowers pH and dissolves calcium faster


Error:

  • Don't bubble water long enough
  • 2 cups not having the same amount of water
  • Lose water when using straw
  • Pout carbon dioxide in both cups.


Ocean Acidification

  • Normal Ocean pH is 8.1-84
  • Ocean's pH has decreased 0.1 (about 25% down)
  • Lower ocean pH means sea animals with shells will not be able to make a shell.