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1. The intensity of sunlight (at midday) is about 1 kW/m2.
2. If solar panels are 20% efficient in making electricity, how large an area of solar panels to produce 5 kW of electrical power?
3. How many hours of sunshine with this set up to collect enough energy to accelerate the sedan as in 2c. above? Assume the electric sedan is 100% efficient, same weight.
4. If is dangerous to look at the sun during an eclipse, in part because the pupil is much more dilated. If the diameter of the pupil increases by a factor of 3 (triples), how much more energy enters the eye in each second of looking than if the pupil were not dialated? [You might answer this without Excel.]
5. How intense is full sunshine compared with a laser that shines 1 mW into a circular bean 3 mm in diameter. [First calculate area of beam, then divide 10-3 W by that to get intensity of laser. Take the ratio of the solar to laser intensities.]
A buffer that contains 0.255 M of acid, HA and 0.153 M of its conjugate base A-, has a pH of 3.39. What is the pH after 0.0115 mol of NaOH are added to 0.666 L of the solution
The pH of a 0.010 mol L-1 solution of a weak monoprotic acid is 2.09 at 25oC. What is the pKa for this acid
Consider the non-aqueous cell reaction 2Na(l) + FeCl2(s) 2NaCl(s) + Fe(s) for which E°cell = 2.35 V at 200°C. ?G° at this temperature is: a. 453 kJ. b. -453 kJ. c. 907 kJ. d. -907 kJ. e. None of these choices is correct.
Calculate the volume of O2 at STP required for the complete combustion of 4.23 L of acetylene (C2H2) at STP.
The equilibrium amounts would stay the same the equilibrium would shift to the right making more reagents the equilibrium would shift to the left making mroe reagents the equilibrium would shift to the right making more products the equilibrium wo..
calculate both its boiling point and its freezing point in C.
Explain why is it significant to add the solution of bromine quickly as well as in one portion to the test tube containing the aromatic substrate
Substitution and elimination reactions are competing reactions. Under what conditions can you ensure that substitution will predominate
Calculate the molar heat of combustion of fructose using the data from this experiment. Since this experiment is carried out under conditions of constant volume, we are measuring ?E. Your answer should be in kJ/mol and entered to 3 sig. fig.
The height of the mercury in the right arm open to atmospheric pressure (760 mmHg) is 100 mm and the height in the left arm is 120 mm. What is the pressure in the bulb
An aqueous solution that 2.10 M in AgNO3 is slowly added from a buret to an aqueous solution that is 1.50×10-2 M in Cl- and 0.250 M in I-. When the second ion begins to precipitate, what is the remaining concentration of the first ion?
Problem- The Ka of a monoprotic weak acid is 3.36 x10-3. What is the percent ionization of a 0.101 M solution of this acid?
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