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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.
In Rutherford's famous scattering experiments that led to the planetary model of the atom, alpha particles (having charges of +2e and masses of 6.64 10^-27 kg) were fired toward a gold nucleus with
A 2.1- Ping-Pong ball is rubbed with a piece of wool, resulting in a net positive charge of 7.8 on the ball. How many electrons were transferred from the ball to the wool in this process?
A 25.0 mL aliquot of 0.211 M citric acidsolution is titrated with 0.143 M sodiumhydroxide solution. If the balanced titration reaction equationis:
During a 5.45 s interval, a particle's coordinates change from x = 10.4 m, y = 4.95 m to x = 28.8 m, y = -4.95 m. Assuming the particle's velocity is constant, what will its coordinates be at the en
Consider the cis trans isomers of 1,3-di-tert-butylcyclohexane. What unusual feature accounts for the fact that one of these isomers apparently exists in a twist-boat conformation rather than a chai