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
Limestone
- 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)