Quiz Prep

Get prepared for the quiz!

Gases dissolved in our atmosphere

carbon dioxide, sulfur dioxide and hydrogen chloride--> create an acidic solution


Carbonic acid--> dissolves in carbon dioxide

Sulfur dioxide--> acid rain

volcanoes ______kill forests

industrial________ pollute water (rivers, lakes, ponds)

pollution

Limestone and Sinkholes

Limestone:


  • porous (holds water)
  • soft
  • soluble in waters (carbonic acid)

Florida Sinkholes occur because:



  • lots of limestone
  • water underground
  • once covered with ocean--> soft calcium deposits (dead animals)

Sulfuric Acid

Discovered in the 8th century by an alchemist--> alchemy (chemistry)

Uses:

  • lead acid batteries (cars)
  • fertilizers
  • steel industry --> prevents rust corrosion
  • dried fruit production (hydrotopic)

Two Gases Post Lab

Magnesium Carbonate and Acid:

co2 is a dense gas and it sinks


When it is filled with carbon dioxide--> gas cannot escape

when it is filled with air--> gas escapes


Magnesium and Acid:

Hydrogen (H)

Light gas rises


when it is filled with air--> gas escapes

when it is filled with hydrogen--> gas cannot escape


"POP"

When it is inverted--> the flammable gas escapes


  • the gas is ignited and rushes out of the test tube. It rubs against the glass causing friction (sound)

Experimental 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

- not keeping test tubes vertical

Acidification of H2O post lab

Phenol Red:

  • ph indicator
  • red:basic
  • clear:basic

-Phenol Red Changes color as you add CO2 into H2O

- the CO2 turns into carbonic acid--> lowering the ph of the H2O

- calcium tablet is more soluble in cup with the straw, because the carbonic acid lowers the ph and dissolves calcium faster


Experimental Errors:

- do not bubble H2O long enough

- 2 cups do not have same amount of H2O

- lose water when using straw

- put CO2 in both cups

Ocean Acidification

Normal ocean ph is 8.1-8.4

- oceans ph has decreased by 0.1 (about 25%)

- lower ocean ph means sea animals with shells will not be able to make a shell (crabs, shrimp, clams, etc.)