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The Km of an enzyme of an enzyme-catalyzed reaction is 6.5 M. What substrate concentration will be required to obtain 55% of Vmax for this enzyme?
If you are told that the purity of compound Z is 87% and the reported value for its molar extinction coefficient is 9200 M -1 cm -1 at 605 nm. What should you measure as the e of this impure compou
The weight of the block on a table is 474 N and that of the hanging block is 205 N. Ignore all frictional effects, and assuming the pulley to be massless. (a) Find the acceleration of the two blocks
Two forces on the object are F1 = 3.2 at 80 below the +x-axis and F2 = 3.2 at 40 above the -x-axis. Is there a third force on the object? Why or why not? What is the magnitude of the third force? Fi
On a cold, dry morning after a frost, the temperature was -5C and the partial pressure of water in the atmosphere fell to 0.30 kPa. Will the frost sublime? What partial pressure of water would ensu
Consider separate 1.0-l samples of He(g) and UF6(g), both at 1.00 atm and containing the same number of moles. What ratio of temperatures for the two samples would produce the same root mean square
Explain with revelant mechanism why sec-butly alcohol loses its optical activity in sulfuric acid, but retains its optical activity indefinitely in aqueous base?
One way to judge the accuracy of your calorimeter is to compare the results for a known system. Examine you % error of specific heat of Aluminum. What does this indicate about the accuracy of your
The wall of a flask is periodically rinsed with the previously boiled, deionized water from the wash bottle. How does this titrimetric technique affect the reported percent acetic acid in the vinega
A neodymium-glass laser emits short pulses of high-intensity electromagnetic waves. The electric field of such a wave has an rms value of Erms = 2.8 x 109 N/C. Find the average power of each pulse t
The electron affinity of each group 5A elements is more positive than that of each corresponding group 4A element. Use the electron configuration of the valence electrons for these columns to sugge
Calculate the effect on the chemical potentials of an increase in pressure of 1.0 bar on the liquid and solid phases of carbon dioxide which are in equilibrium. Relevant densities are 2.35 g/cm^3 a
When a 50-gram piece of aluminum at 100 degrees celsius is placed in water, it loses 735 calories of heat while cooling to 30 degrees celsius. Calculate the specific heat capacity of the aluminum.
Determine the limiting reactant when 114.0g of Fe2O3 (molar mass = 159.69 g/mol) are reacted with 56.8 g of CO (molar mass = 28.01 g/mol)?
A long pair of wires conducts 23.7 A of dc current to, and from, an instrument. If the insulated wires are of negligible diameter but are 2.8 mm apart, what is the magnetic field d = 11.6 cm from th
Calculate iron's temperature changes when a 30-gram piece of iron is dropped into a container of water and gives off 165 calories in cooling. Can you show this using a formula with mass, calories an
A wire forms a semicircle of radius R = 7.10 cm and two (radial) straight segments each of length L = 13.1 cm. The wire carries current i = 48.0 mA. What is the magnitude and direction of the net ma
The bungee cord has an unstretched length of 27.0 m. To be safe, the bungee cord should stop George's fall when he is at least 2.00 m above the river. If George has a mass of 75.0 kg, what is the mi
Calculate the change in entropy for one mole of a diatomic ideal gas (Cv = 5/2 nR) that is heated and compressed from 25.0°C and 10.0 L volume to 100.0°C and 1.00 L volume.
A 368-g sample of water absorbs infrared radiation at 1.06 x 10^4 nm from carbon dioxide laser. Suppose all the absorbed radiation is converted to heat.
Capacitor A with a capacitance Capacitor A= 35 uF is fully charged by a battery to a potential difference of 12 V and then disconnected from the battery. After that, capacitor A is connected to an u
What is the major product in the Claisen condensation of ethyl propanoate in the presence of excess sodium ethoxide (assuming standard acidic work-up)?
A 4.50 x 102 kg hot-air balloon takes off from rest at the surface of the earth. The nonconservative wind and lift forces take the balloon up, doing +9.70 x 104J of work on the balloon in the proce
Pure water is saturated with a 2:1 mixture of hydrogen and oxygen at a total pressure of 5 atm at 298 K. The water is then boiled to remove all the gasses.
Your mass is m = 59 kg. Neglect frictional forces between the raft and the water. how far from the end of the pier is the center of mass of the you-raft system?