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How would you prepare a liter of "carbonate buffer" at a pH of10.10? you are provided with H2CO3, NaHCO3, and Na2CO3.
How much ice in grams would have to melt to lower the temperature to 468 ml of water from 39 degrees C. to 2 degrees C. (Assume the density of water is 1.00 g/ml, the heat of fusion for water at 0 d
How much heat in kilojoules is evolved in converting 36.0 g steam at 180 degrees C. to ice at -60 degrees C. (heat capacity of steam is 1.184 J/g-c & ice is 2.09 J/g-c, the heat vaporization is
A boxer receives a horizontal blow to the head that topples him over. The force, of magnitude 1.35 x 103 N, is applied for 1.7 x 10-2 s at a point 1.67 m above the floor. The boxer has a moment of ine
If 3 mol of hydrogen is now added to the equilibrium miaxture , what is the new equilibrium concentration of ammonia ?
A red laser pointer emits light at a wavelength of 808 nm. If the laser emits 7.50E-4 J of energy per second in the form of visible radiation, how many moles of photons per second are emitted from t
A hair dryer has a power rating of 12000w at 120v rms. assume that the hair dryer is the only resistance in the circuit. What is the resistance of the heating element?
When the difference in pH across the membrane of a glass electrode at 25 degrees c is 3.76 pH units, how much voltage is generated by the pH gradient if the slope of calibration is100%
A 1.83kg book is placed on a flat desk. Suppose the coefficient of the static friction between the book and the desk is 0.442 and the coefficient of kinetic friction is 0.240. How much force is need
The drawing shows two situations in which charges are placed on the x and y axes. They are all located at the same distance of 6.4 cm from the origin O. For each of the situations in the drawing, de
Worker one applies 200 lbs of force, while worker 2 applies 120 lbs of force. Approximately how much force is applied to the stump?
How many faradays are transferred in an electrolytic cell when a current of 2.0 amperes flows for 12 hours?
HI has a normal boiling point of -35.4 degrees C, and itsΔHvap is 21.16 kJ/mol. Calculate the molar entropy of vaporization.
A standard 400 meter running track has semi-circles at each end. How many radius lengths mark-off the entire arc length of a semi-circular end of the track? Give an exact result.
What is the angular magnification when the image formed by the lens is at the near point of the eye (25 cm)?
What are some of the possible sideproducts from an aldol condensation reaction, where abenzaldehyde reacts with an acetone molecule.
The total charge on the conducting spherical shell is -Q. (Assume the potential is zero very far from all charges. Use a, b, c, k, and Q as necessary.)(a) What is the electric potential of the spher
The complex [FeF6]3-has a high-spin electron configuration. How many unpaired electrons are there in the complex?
Suppose that 2¢ is deposited in a savings account paying 1% annual interest compounded continuously. How much money will have accrued in the account after 2000 years?
Draw the stepwise function curly arrow mechanism for the tautomerisation of propanone with (i) catalyst, H30+, and (ii) a base catalyst, HO-
A cube of material is placed with one corner at the origin of a coordinate system; its sides, 1vm long a re parallel to the three axes. The current density is Ai+Bj+Ck throughout the cube. The units
If I drop a 0.2kg ball from a height of 2 m onto the floor, and It bounces back to a height of 1.6m. How much energy did it lose in the collision with the floor and to air resistance?
How long does it take the restaurant to rotate through 4 radians? How far does a person sitting by the window move in 100 minutes if the radius of the restaurant is 21 meters?
Given that prices cannot be negative and that demand should be zero or more, what domain makes business sense for the demand function? Use inequality notation.
The brakes of a truck cause it to slow down by applying a retarding force of 3.40 103 N to the truck over a distance of 920 m. What is the magnitude of the work done by this force on the truck? Is t