Waste Buds
What the Gas?
Over Reacting
What's the Matter?
Mole-tastic
100
What are the 4 main types of landfills that exist?
Municipal Solid Waste Landfill
Industrial Waste Landfill
Hazardous Waste Landfill
Green Waste Landfill
100
What is landfill gas? What is it composed of?
By volume, landfill gas typically contains 45% to 60% methane and 40% to 60% carbon dioxide.
And small amounts of nitrogen, oxygen, ammonia, sulfides, hydrogen, carbon monoxide, etc.
100
What is a chemical reaction?
The reactants (starting materials) are converted to one or more different products.
Rearrangement of the atoms of the reactants to create different products.
100
What is the ACCURATE definition of the law of conservation of matter?
The law of conservation of matter states that matter can neither be created nor destroyed in the WHOLE UNIVERSE.
100
1 mole can equal what?
1 mole = molar mass (g)
1 mole = 22.4 L
1 mole = 6.02x1023 particles (molecules, atoms, ions)
200
What is the difference between municipal solid waste and green waste?
Common types of green waste:
Mulch
Weeds
Leaves
Tree branches
Biodegradable food waste
Flowers and grass trimmings
200
What are the 3 processes that produce landfill gas?
Bacterial decomposition
Volatilization - waste turns into a vapor/gas due to heat for example
Chemical reactions - burning waste
200
What are the 5 main types of chemical reactions we discussed in our class?
Synthesis
Decomposition
Single Replacement
Double Replacement
Combustion Reactions
200
The universe consists of 2 things. What are they?
system + surroundings
200
What is the definition of molar mass?
The mass of a particle (atom, molecule) in one mole of that particle.
300
What happens to your waste after it leaves your home in San Jose?
It goes to a sorting facility before the waste is transferred to the designated landfill.
300
What gas is produced in the first half of bacterial decomposition and what gas is produced in the second half of bacterial decomposition?
First half --> carbon dioxide
Second half --> methane
300
What do the coefficients represent?
4 Fe (s) + 3 (O)2 (g) --> 2 Fe2O3 (s)
The represent ratios.
300
What is the difference between an open and closed system?
300
Why do the molar masses of elements on the periodic table vary?
Because the mass of the individual atom of those elements varies.
400
What are the 4 major components of any landfill?
Liners
Pipe for gas
Pipe for leachate
Soil
400
What conditions affect landfill gas production? Name at least 3. Use common sense.
Waste composition - what the waste is made up of
Age of refuse - age of waste buried in the landfill
Newer waste = more gas production
Peak gas production occurs 5 to 7 years after waste is buried
How much oxygen is present at the landfill
Moisture content
More moisture = more gas production
Temperature
Higher temperature = more gas production
400
What is the difference between element, atom, molecule, and compound?
Element - Substance made up of the same atoms
Atom - Smallest unit of an element
Molecule - Made up of 2 or more atoms whether of the same element or different elements
Compound - Made up of 2 or more atoms of DIFFERENT elements
400
Explain what happened to the matter in this experiment.
The system was exposed to the surroundings.
The gas escaped from the flask (the system) into the air (the surroundings). BUT this gas is still in the universe. Although the mass was not conserved in the system, it is still conserved in the universe.
From that perspective, reaction A did NOT violate the law of conservation of matter.
400
How many atoms of carbon are in 76.9 mol of ethane (C2H6) at STP? Must show work.
9.26x1025 atoms of carbon
500
List the names of the 4 landfills in San Jose.
Guadalupe Mines Landfill
Kirby Canyon Landfill
Zanker Road Landfill
California Waste Solutions
500
What is the difference between aerobic and anaerobic bacteria?
Aerobic bacteria—bacteria that live only in the presence of oxygen.
Anaerobic bacteria - bacteria that live don't require oxygen.
500
Balance the following combustion reaction. Show work.
C3H6 + O2 → CO2 + H2O
2 C3H6 + 9 O2 → 6 CO2 + 6 H2O
500
What are the 5 indicators of a chemical reaction?
Fizzing
Odor
Temperature
Color
Precipitate
500
How many grams of hydrogen are in 624.9 g of ammonia (NH3) at STP? Must show work.
110.96 g H