silica in class guide 472

FALBERTA It is estimated that the total amount of oxygen (O2) contained in BIFS is equivalent to 6.6% of the oxygen present in the modern atmosphere. This is quite impressive given that the atmosphere during Archaean and early Proterozoic times was largely devoid of oxygen! Therefore, this reflects the photosynthetic efficiency of the early biosphere, coupled with its operation over long periods of time. Knowing that the mass of the modern atmosphere is 5.01×1018 kg, of which 21% is oxygen, what is the mass (in kilograms) of oxygen contained within BIFS? 6.9 x 1016 kg of O2 contained in BIF deposits Knowing that the molecular mass of O2 is 32 g/mole (0.032 kg/mole), how many moles of O2 are contained within BIFS? 2.17 x 1018 moles of O2 contained in BIF deposits Now, let us think about iron (Fe). The total mass of BIF's globally is estimated at 5.0x1017 kg, wherein iron accounts for approximately 35% by mass. The atomic mass of iron is 55.8 g/mole (0.0558 kg/mole). What is the total…

A styrofoam cup was analyzed in a lab and found to contain 92% by mass carbon. How much carbon can be found in a stack of polystyrene cups with a total mass of 569 grams?

Paragraph 5: Discuss Fractional Distillation of petroleum oil to give the chemical feedstock to make synthetic polymers for commercial use of products in our daily lives and discuss your personal thoughts on incresing US drilling in the Gulf of Mexico or in the Artic. Think about it, every time you go to the grocery store and get a plastic bag which immediately gets discarded. Include your thoughts on mandatory recycling in the US especially for schools, government buildings, etc.

Why do certain microbes oxidize ammonium and sulfide? How do these processes affect soil fertility?

2Na + BaCl2 --> Ba + 2NACI is what type of reaction?

QUESTION 4 From the Coursebook: What is a useful marker point for the Global Anthropocene? When glacial sediments are replaced by organic sediments When Carbon Dioxide (CO2) and Methane (CH4) first get recorded in rocks and sediment When Carbon Dioxide (CO2) and Methane (CH4) first appeared in the atmosphere Excess of radioactive isotopes such as 14C and 239Pu in rocks and sediments

How many pounds of CO2 would you be responsible for emitting if you took a bus and traveled 164 miles? If that bus got 8 miles per gallon and released 22 lbs of CO2 per gallon of gas, but was carrying 20 Passengers?

7. Methylhydrazine is commonly used as a liquid rocket fuel. Its combustion is indicated by the following reaction. N₂H3 CH3(1) + O20) → N2(9) + CO2(g) + H₂O (9) a. Balance this equation. b. Calculate AH for this reaction.

In addition to burning, what issues do fossil fuels cause in the environment? Provide examples. How can extracting and transporting fossil fuels lead to damage?

Dynamite consists of nitroglycerine mixed with diatomaceous earth or cellulose. What is another name for dynamite?     KBr     KOH     TNT     C-4     CFC

Heptacarbon octahydride is an effective gasoline additive. In the presence of oxygen gas (and a spark), it undergoes complete combustion. (a) Write the balanced equation for this reaction. Identify the oxidizing agent and reducing agent.

A Styrofoam cup was analyzed in a lab and found to contain 92% by mass carbon. How much carbon can be found in a stack of polystyrene cups with a total mass of 569 grams? 0618 grams 520 grams O456 grams 535 grams 575 grams

Describe two sources of hydrocarbons in the atmosphere. Which one is more readily controlled?

·       A hypothesis about CO2 emissions.

What is one property of carbon that explains why it is so abundant in living things?

Suppose a certain copolymer elastomeric material “styrene-butadiene rubber”) contains styrene ("S") monomers –(C8H8)– and butadiene ("B") monomers –(C4H6)– and that their numerical ratio S:B = 1:8. What is the mass ratio mS:mB of the two monomers in the material? What is the molecular mass M of a macromolecule of this copolymer with degree of polymerization n = 60,000? Data: AC = 12.01 u, AH = 1.008 u.