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The heat capacity of the calorimeter was 24.5J/0C and contained exactly 1250g water which increased from 24.620C to 27.430C. Calculate (Delta)U for the reaction in kJ/mol rxn
An FM radio station broadcasts electromagnetic waves at a frequency of 550 kHz. Calculate the wavelength of the waves.
A bomb calorimeter with an insulating heat capacity is used to burn 5.682g of a chocolate candy bar. If the 1.00kg of water in the calorimeter then increased from 18.0220C to 56.1250C, what is the U
Find an expression for the volume charge density ?(r) inside the ball as a function of r. Express your answer in terms of the variables Q, r, R, and appropriate constants
Calculate the standard molar enthalpy of formation of carbon dioxide from the following enthalpy changes. 2C(s) + O2(g) --> 2CO(g) [?H0 = -221.0kJ] and 2CO(g) + O2(g) --> 2CO2(g) [?H0= -566.0k
The temperature at which a substance melts or boils depends upon the strengths of the intermolecular forces. What must happen for a substance to melt in terms of particles, intermolecular forces, an
Calculate the ratio of the kinetic energy to the potential energy of a simple harmonic oscillator when its displacement is 1/8 its amplitude
Predict whether a reaction will occur in aqueous solution between the following pairs of substances. If a reaction does occur derive the net ionic equation. Specify the driving force : Precipitate f
Use the reactions below and their equilibrium constants to predict the equilibrium constant for the reaction, 2A(s) <-> 3D(g). 2A(s) <-> 1/2B(g) + C(g) K1 = 0.0334
Use the reactions below and their equilibrium constants to predict the equilibrium constant for the reaction, 2A(s) <-> 3D(g).
Permanganate can be used to oxidize oxalic acid all the way to carbon dioxide. If you balance this redox reaction in acidic solution, which of the following statements about the balanced reaction is
Find the electric field inside a hollow plastic ball of radius R that has charge Q uniformly distributed on its outer surface
Calculate the number of cells in a hummingbird assuming the mass of an average cell is ten times the mass of a bacterium
he following compound has two stereoisomers. One has a dipole of 0 D, and the other has a dipole moment of 2.95 D. Draw the structure of the stereoisomer with dipole moment of 0 D
The pilot of an airplane executes a loop-the-loop maneuver in a vertical circle. What is the pilot's apparent weight at the lowest point if his true weight is 160 lb
The following compound has two stereoisomers. One has a dipole of 0 D, and the other has a dipole moment of 2.95 D. Draw the structure of the stereoisomer with dipole moment of 2.95 D
Draw the Lewis structure of CH2N2 in its best resonance form. The sigma-bond network is given to you
An empty flask weighs 252.2 grams. When filled with water ( d= 1.00 g/cm3) the flask and its contents weigh 591.8 g)
Draw the best Lewis structure of CO32-. In this compound, the C atom is attached to three O atoms, and there are no O-O bonds
An 88? resistor has a current of 0.70A and is connected in series with a 130? resistor. What is the emf of the battery to which the resistors are connected
A 3.0 m tall, 64 cm diameter concrete column supports a 205,000 kg load. By how much is the column compressed
A 50 mL sample of 0.10 M HCl is mixed with 100 mL of 0.20M NH3. What is the resulting pH? (Kb for NH3 = 1.8 x 10-5).
A 473g wood block is given a quick push across a table. During the push it accelerates at a rate of 0.69m/s2, what was the strength of the force used to push the block to start with
How many moles of CaF2 will dissolve in 3.0 liters of 0.150 M NaF solution? (Ksp for CaF2 = 4.0 x 10-11).
A 70 cm long, 0.8 mm diameter steel guitar string must be tightened to a tension of 2000 N by turning the tuning screws. By how much is the string stretched