John K

Benzene (1 g, 12.5 mmol) is allowed to react with 1-chloropropane (1 g, 12.5 mmol) and AlCl3. The product (1.2g) is subjected to analysis on a GLC equipped with a thermal conductivity detector. The chromatogram shows two product peaks identified as n-propylbenzene (area=65 mm^2, Wf=1.06) and isopropylbenzene (area=113 mm^2, Wf=1.09). Calculate the percent yield of each of the two isomeric products obtained in this reaction. Note that since each of the products has the same molar mass of 120, the use of weight factors gives both weight and mole percent composition.

Compare the utility of ADP, and NADPH, generated by photosynthesis, in terms of the Calvin Cycle.

In terms of the dark reaction of C3 photosynthesis, what is the first cellular hydrocarbon to receive atmospheric carbon dioxide? What is the ultimate fate of this molecule, once this happens?

Compare the utility of ADP, and NADPH, generated by photosynthesis, in terms of the Calvin Cycle.

In terms of the dark reaction of C3 photosynthesis, what is the first cellular hydrocarbon to receive atmospheric carbon dioxide? What is the ultimate fate of this molecule, once this happens?

The half-life of 15 over 8 Oxygen is 122 s.

How long does it take for the number of 15 over 8 Oxygen nuclei in a given sample to decrease by a factor of 5×10^−4?

Find an expression for the de Broglie wavelength of an electron in the nth state of the hydrogen atom.

Express your answer in terms of some or all of the variables n, m, e, and appropriate constants.

The kinetic energy of an electron in a particular Bohr orbit of hydrogen is 1.35x10^ - 19 Joules.

Suppose the electron moves away from the nucleus to the next higher Bohr orbit. Calculate the kinetic energy of the electron in the orbit now in eV.

Find the kinetic energy of an electron whose de Broglie wavelength is 1.5 A.

A photon has an energy E and wavelength lambda before scattering from a free electron. After scattering through a 140 angle, the photon's wavelength has increased by 11.0%.

Find the initial wavelength of the photon in pm.

Find the initial energy of the photon in fJ.

A 6.2 ft tall shopper in a department store is 18 ft from a convex security mirror. The shopper notices that his image in the mirror appears to be only 6.4 in. tall.

What is the mirror's radius of curvature in ft?

A 1.15 kilo Ohms resistor and a 590 mH inductor are connected in series to a 1350 Hz generator with an rms voltage of 12.1 V.

What is the rms current in the circuit in mA?

What capacitance must be inserted in series with the resistor and inductor to reduce the rms current to half the value found in part A in nF?

A 1.15 kilo Ohms resistor and a 590 mH inductor are connected in series to a 1350 Hz generator with an rms voltage of 12.1 V.

What is the rms current in the circuit in mA?

What capacitance must be inserted in series with the resistor and inductor to reduce the rms current to half the value found in part A in nF?

Find the frequency at which a 35 uf capacitor has the same reactance as a 34 mH inductor in Hz.

What is the resonance frequency of an LC circuit made with this inductor and capacitor?

The lightbulb in the circuit shown in the figure has a resistance of 10 Ohms and consumes 8.6 W of power; the rod is 1.40 m long and moves to the left with a constant speed. The strength of the magnetic field is 2.5 T.

Find the current in the circuit.

Find the speed of the rod.

Find the average magnitude in Volts of the induced emf if the change in shape occurs in 4.26 s and the local 0.127 T magnetic field is perpendicular to the plane of the loop.

It is desired that a solenoid 37 cm long and with 410 turns produce a magnetic field within it equal to the Earth's magnetic field (5*10^-5 T). What current is required? Please show work and the answer, I want to see the steps in solving this problem. Thank you!

Two spheres with uniform surface charge density, first with a radius of 7.5 cm and the second with a radius of 4.7 cm, are separated by a center-to-center distance of 33 cm. The spheres have a combined charge of + 55 uC and repel one another with a force of 0.73 N. Assume q_1>q_2

What is the surface charge density on the second sphere?

I already got the answer for the first sphere which is 7.8*10^-4 but I can't get the second one. I thought it was 4*10^-6 but its not. please help!! show work and answer please!!

Two spheres with uniform surface charge density, first with a radius of 7.5 cm and the second with a radius of 4.7 cm, are separated by a center-to-center distance of 33 {\rm cm}. The spheres have a combined charge of + 55\mu {\rm{C}} and repel one another with a force of 0.73 N. Assume q_1>q_2.

What is the surface charge density on the first sphere?

What is the surface charge density on the second sphere?

A computer monitor accelerates electrons and directs them to the screen in order to create an image.If the accelerating plates are 1.05 \rm cm apart, and have a potential difference of 2.60×104 V, find the change in electric potential energy for an electron that moves from one accelerating plate to the other. The unit needs to be Joules