4.9 Quiz

Acidification & Two Gases Lab

Acid Rain

Gas that is being dissolved in our atmosphere creates an acidic solution. The gases involved include:

  • CO2
  • Sulfur
  • Hydrogen chloride

Carbonic Acid is dissolved CO2

Sulfur Dioxide dissolved in our atmosphere is called acid rain.

  • Kills forests
  • Pollutes water (rivers, lakes, and ponds)

What does calcium carbonate do to water?

  • It makes it harder- hard water

Why can't a city publish any law that includes that they can't distribute water that contains any toxic substances?

  • Toxic substances (minimal amounts) are in public water
  • All water would have to be recollected, no water for the citizens

Why are large deposits of sodium chloride & potassium nitrate found near many deserts?

  • Most deserts were once oceans
  • Rain does not fall very often in deserts
  • Couldn’t wash away the shells

Limestone, Sulfuric Acid, & Sinkholes


  • Very porous (holds water)
  • Soft
  • Soluble in water & carbonic acid
  • Made of many layers of old crustaceans and animal bones

Why do Florida sinkholes occur?

  • Many springs of water underground (aquifer)
  • Lots of limestone under the surface
  • The limestone gets dissolved by continuous amounts of carbonic acid and water
  • Soft calcium deposits (dead animals) under the surface

Sulfuric Acid

  • Discovered in 8th century by Alchemists
  • Was used to turn thing into gold
  • Alchemy--> chemistry

Sulfuric Acid uses:

Lead acid batteries

  • Prevents erosion
  • Fertilizers
  • Steel industry
  • Dried fruit production (hydrotropic)

Two Gases Lab

Magnesium Carbonate and Acid

  • CO2 is a dense gas, so it sinks
  • Upright test tube is filled with CO2 (gas can't escape)
  • Inverted test tube is filled with air (gas escapes)

Magnesium and Acid

  • Hydrogen (H) is a light gas, so it rises
  • Upright test is filled with air (gas escapes)
  • Inverted test tube is filled with hydrogen (gas can’t escape)

The Pop

  • The gas is ignited and rushes out of test tube
  • Rubs against glass and causes friction (popping noise)