Quiz Prep

Everything needed

Gases Dissolved In Our Atmosphere:

  1. carbon dioxide
  2. sulfur dioxide
  3. hydrogen chloride

= create an acidic solution in water


carbonic acid--> dissolved carbon dioxide

sulfur dioxide--> "acid rain"


  • volcanoes
  • industrial pollution


Acid Rain


  • kills forests
  • pollute water (river, lake, pond)

Sulfuric Acid

discovered by humans in 8th century by alchemist--alchemy "chemistry"


USES

  • lead acid battery (cars)
  • fertilizers
  • steel industry--> prevent rust corrosion
  • died fruit products--> hydrotropic

Limestone and Sinkholes

Limestones:

  • porous (hold water)
  • soft
  • soluble in water (carbonic acid)

FL sinkholes occur because:

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

Post Lab of Two Gases Lab

magnesium carbonate and acid

co2 ------> dense gas that sinks

-filled with co2-----> the gas cannot escape

-filled with air------> gas escapes


magnesium and acid

hydrogen--> light gas that rises

-filled with air--> gas escapes

-filled with hydrogen--> gas cannot escape

-flammable gas---> escapes


the "pop"

gas is ignited and rushes out of the test tube

it rubs against the glass and causes friction which produces a sound



Experiment 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
  • stoppers not on tight
  • not keeping test tube inverted

Phenol Red

ph indicator

red: basic

clear: acidic

Post Lab of Acidification of Water Lab

  • phenol red changes color as you add carbon dioxide to the water
  • the carbon dioxide turns to carbonic acid lowering the ph of the water
  • calcium tablet is more soluble in the cup with the straw
  • because the carbonic acid lowers ph and dissolves calcium faster
  • the more acidic something is the more soluble it is


Experimental Errors

  • dont bubble water long enough
  • 2 culs don't have same amount of water
  • lose water when using straw
  • put carbon dioxide in two cups

Ocean Acidification

normal ocean ph is 8.1->8.4

  • ocean's ph has decreased 0.1 (25%)
  • lower ocean ph means sea animals with shells with not be able to make a shell (crabs, shrimp, clams, etc)
  • shells made out of calcium