Astronomy

Report about life on Mars.

Chemical Weathering & Soil Erosion

a) How is carbonic acid (H₂CO₃) formed in nature?
b) What controls the soil formation?
c) Is soil erosion a natural process or primarily the result of inappropriate land use by people? Explain.

Oxygen, kept at a pressure of 10.1 kPa, is heated to a temperature of 4000 K. Determine the relative amounts of diatomic and monatomic oxygen that are present after the heating

You have 5 mL of vinegar in a flask and 2 drops of phenolphthalein indicator. You titrate exactly 36.9 mL of 0.1 mol/L NaOH from a burette directly into the flask which gives you a pale pink color. This means the solution has reached neutralization. Calculate n of the NaOH.

Suppose 0.22 L of 0.5 mol/L NaOH solution was titrated with 5 L of HCl using phenolphthalein indicator. Calculate the amount of the base and the acid that were used to reach the neutralization point.

50 L of 2.0 mol/L Hydrochloric acid is titrated with sodium hydroxide to form water and sodium chloride. How many moles of sodium hydroxide are consumed in this reaction?

You have 5 mL of vinegar in a flask and 2 drops of phenolphthalein indicator. You titrate exactly 36.9 mL of 0.1 mol/L NaOH from a burette directly into the flask which gives you a pale pink color. This means the solution has reached neutralization. Calculate C of the vinegar in mol/L.

00 L of 5 mol/L NaOH are required to fully titrate a 50 L solution of HCl. What is the initial concentration of the acid?

57. Name five observed and/or potential consequences of global warming.

Consider the following data concerning an acetic acid/benzene mixture at 50 ^a C. The vapor pressure of pure benzene is 35.62 kPa at this temperature while pure acetic acid has a vapor pressure of 7.34 kPa. A 0.2973 mole fraction acetic acid solution is in equilibrium with a vapor that has a partial pressure of 28.16 kPa for benzene and 3.31 kPa for acetic acid.

What are the Raoult's law activity coefficients for solute and solvent in this system?

Is the heat of mixing in this system most likely zero, positive , or negative? Explain

If the partial pressure of solute is 0.484 kPa for a 0.0160 mole fraction acetic acid solution, what value for the Henry's law constant on the mole fraction scale would you predict for this solute in this solvent? You can assuming that the concentration of acetic acid is low enough that you are in the limiting law region.

Compose a short essay on African History focusing on the impact the Saharan Desert had on the development of the continent.

1. Define religion and discuss why people believe in religion? What is the difference between a myth and doctrine? How does animism and animatism relate to sacred spaces and people’s belief systems? Compare and contrast the religious practices of the Australian Aborigines, and Yanomamo. What role has culture and environment played in the development of these religious systems and beliefs? Make sure to include examples from class, text and lecture.

Why the temperature increase when flow rate of air increase in air-ch4 combustion, and equivalence ratio always uniforms ??

A centrifugal pump delivers water at rate of 0.22 m³/s from a reservoir at a ground level to another reservoir to height 'h' through a vertical pipe of 0.2 m diameter. Both are open to atmosphere. Power input to pump is 90 kW and it operates with 75% efficiency . f=0.004 use g=9.8 m/s² density=1000kg/m³. Find 'h'.

When boiling​ water, a hot plate takes an average of 88 minutes​ [min] and 1515 seconds​ [s] to boil 170170 milliliters​ [mL] of water. Assume the temperature in the lab is 6969 degrees Fahrenheit. The hot plate is rated to provide 501501 watts​ [W]. If we wish to boil 170170 milliliters​ [mL] of acetone using this same hot​ plate, how long do we expect the process to​ take? Acetone has a boiling point of 5656 degrees Celsius. ​[Hint: you must determine the efficiency of the​ hotplate.]

1.) What role, if any, do aquifers depletion overdrawing of surface waters, and salinization of irrigated soil play in the water problems associated with the High pLAINS AQUIFER AND THE COLORADO RIVER BASIN? How are these issues affected by drought and by development?

2.)Explain whether each of the following represents the point or nonpoint source pollution: fertilizer runoff, thermal pollution from a PowerPoint plant, urban runoff, sewage from a ship and erosion sediment from deforestations. Which is more difficult to control nonpoint source or point source pollution? Why?

list the sequence of features that could form along a rocky, emergent coastline and describe how each feature is formed

Recall that there are four fundamental forces: the gravitational force, the electromagnetic force, the weak nuclear force, and the strong nuclear force. Select any two of these forces and compare them. Consider their relative strengths, the range of distances over which they operate, and why they are important.

Derive the kinetic equations (Michaelis-Menten equation) about 3 reversible inhibition kinetics: competitive inhibition, uncompetitive equation, and noncompetitive equation.