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Carotenoids, present in all organisms capable of photosynthesis, extend the range of light absorbed by the organism. They exhibit maximal capacity for absorption of light in the range of 440-470nm.
Quinine in a 1.664 g antimalarial tablet was dissolved insufficient 0.10 M HCl to give 500 mL of solution . A 20.00 mLaliquot was then diluted to 100.o mL with the acid.
The maximum safe current in a copper wire with a diameter of3.0 mm is about 20. amperes. In a STM, a current of 7.5x10-10 Apasses from the tip to the surface in a filament of diameter appox1.5 nm.
Graphite is burned in oxygen to give carbon monoxide and carbon dioxide. if the product mixture is 33% CO and 67%CO2 by mass, what is the heat from from combustion of ig og graphite?
Give the Equations representing the first and second dissociations of tartaric acid. Calculate the value of the firstdissociation constant, K1, for tartaric acid if the value of the second dissociat
Explain why the pure solvent shows a level horizontal curve as solidification occurs, but the curve for the solution slopes downward slightly.f
Based on the above chemical reaction the activation energy wasd etermined to be 80.8 kJ/mol and the rate constant was determinedto be 6.9x10^ -3 at 40 degrees Celcius.
A 260.0 mL buffer solution initially contains2.5×10-2 Mof HCHO2 and2.5×10-2 M of NaCHO2. Inorder to adjust the buffer pH to 4.20, you should add NaOH to the buffer mixture. What mass of
You want to make an acetic acid/acetate buffer, pH 5.6, with avolume of 250 mL, and a final concentration of ([AcOH] +[AcO-]) = 0.1 M. You may only use acetic acid and sodium acetate (no strong acid
In your house (elevation 950ft above sea level) you have a barometer that registers inches of mercury. On an average day in january, the pressure was 0.966 bar on 700 ft elevation. what is the corre
Sulfur trioxide can be removed from the exhaust gases of powerplants by reaction with lime according to the equation,CaO(s)+SO3(g)--> CaSO4(s), withΔHo= -886kJ. If 240 kg of SO3 is to bere
A runner generates 418 kJ of energy per kilometerfrom the cellular oxidation of food. The runner's body mustdissipate this heat or the body will overheat. Suppose that sweatevaporation is the only i
A braking force of 6000 N was applied to a 100kg truck bringing it to a complete rest in 75m. a. how much work ws done in stopping the truck
What is the activation energy of a reaction if its rate constant at 35 C was double the value of the rate constant at 25 C?
A boat has a mass of 40,000kg. its engine gives it an acceleration of 0.2 m/s while it goes a distance of 100m from rest. a. what force does the eingine exert on ship?
If 10.08 g of coppermetal is heated strongly in air, the sample gains 2.49 g of oxygen in forming an oxide. Determine the empirical formula for this oxide.
At a water park, a 50kg lady goes down a water slide. At a point 3m above the plash-down pool, the lady passes a radar type speedometer that determines the lady's speed is 12m/s.
How much energy is required to vaporize 125g of benzene,C6H6, at its boiling point, 80.1 degreescelsius? The heat of vaporization of benzene is 30.8kJ/mol. Specific heat of benzene is 1.74J/gC.
Suppose 5.00 g of hydrogen is separated into electrons and protons. Suppose also the protons are placed at the earth's North Pole and the electrons are placed at the South Pole. What is the resulti
Write the mechanism for the reaction of the elimination reaction of 2-iodo-1,1-dimethylcyclopentane with H2O and provide the final major product.
A container contains oxygen, neon and helium whose partialpressure are 100 torr, 300 torr and 200 torr respectively. What is the mole fraction of neon?
A 0.421-g sample of asprin prepared in ther laboratory isdissolved in 95% ethanol, diluted with water, and titrated to the phenolphthalein endpoint with 17.3 mL of 0.114 M NaOH.
Gulls are often observed dropping clams and other shellfish from a height to the rocks below, as a means of opening the shell. If a seagull drops a shell from rest at a height of 14 m, how fast is t
Formic Acid, HFor, has a Ka value equal to about 1.8 X10-4. A student is asked to prepare a bufferhaving a pH of 3.40 from a 0.10 M HFor and a 0.10 M NaForsolution.