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Scientists often use models to illustrate abstract concepts or to help in evaluating a theory. Describe the three types of models (layer sequence drawings, computer graphics, balls and sticks) used for visualizing the three dimensional structure of unit cells. Then explain how each type helped you to learn about the structures in different ways.
Estimate how many barrels of fluid this tank could hold. Clearly state any assumption you must make to determine this and explain how you arrived at your assumption
If 4.86 g of solid carbon dioxide was placed into an evacuated 2.00 L container, sealed, and then heated until it completely changed to a gas with a final temperature of 75 degrees celcius, what would be the pressure?
if .025 grams of Pb(NO3)2 is dissolved in 100. grams of H2O, what is the concentration of the resulting solution in parts per million?
Why do some scientists have concerns have regarding further increases in bio fuel production. giving chemical reasons explain why is is expensive to manufacture ethanol from cellulose.
A mixture consists of 323 mg of methane, 165 mg of argon, and 223 mg of nitrogen. The partial pressure of nitrogen at 275 k is 19 kPa.
From data below, calculate the total heat (in J) associated with the conversion of 0.412 mol ethanol gas (C2H6O) at 501°C and 1 atm to liquid ethanol at 25.0°C and 1 atm
When the reaction 2H2S(g)-> 2H2(g) + S2(g) is carried out at 1065°C, Kp = 0.012. Starting with pure H2S at 1065°, what must the initial pressure of H2S be.
The rate is measured at 300 K. To what temperature must the reaction be raised to double the rate? a) 310k b)333k c)353k d)363k e)373k f)412k
How much energy (in kilojoules) is needed to heat 3.20 of ice from -14.5 C to 23.5 C? The heat of fusion of water is 6.01, KJ/Mol and the molar heat capacity is 36.6 J/
The bond distance and dipole moment calculated for the highly reactive gas phase OH molecule are 0.98Ao and 1.78D, respectively. Compute the effective charges on the O and H atoms of the OH molecule (in units of the electronic charges).
Calculate the pressure exerted in the closed end of an apparatus. If the atmospheric pressure 720 torr and the height of the water column is 22.3cm.
The enthalpy of fusion of methanol (CH3OH) is 3.16 kJ/mol. How much heat would be absorbed or released upon freezing 25.6 grams of methanol?
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