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An AM radio station broadcasts with a power of 28.0kW at a frequency of 890kHz. Estimate the intensity of the radio wave at a point 13.0km from the broadcast antenna.
Give the names and charges of the cation in each of the following compounds: CuS, Ag2SO4, Al(ClO3)3, Co(OH)2, PbCO3. Express your answers as ions separated by commas.
If the backpack begins to slide when the spring ( = 140 ) stretches by 2.50 , what is the coefficient of static friction between the backpack and the table?
what is the end value of n in a hydrogen atom transition, if the electron starts in n=2 and the atom absorbs a photon of light with a frequency of 4.57*10^14 Hz?
An aqueous soultion of uknown salt of ruthenium is electrolyzed by a current of 2.50 amps passing for 50 min. if 2.618 g Ru is produced at the cathode, what is the charge on the ruthenium ions in s
A firefighter of mass 69 kg slides down a vertical pole with an acceleration of 3 m/s2. The acceleration of gravity is 10 m/s2 . What is the friction force that acts on him? Answer in units of N.
The He is used to fill balloons to a volume of 2.50 L at 732 mm Hg and 27 degree C. How many balloons can be filled with He?
A chemist dissolves 0.099 g of CuSO4 · 5 H2O in water and dilutes the solution to the mark in a 500-mL volumetric flask. A 36.1-mL sample of this solution is then transferred to a second 500-
A solution made by adding .106 mol of CH3COOH to 1.0 kg of water is found to freeze at -.203 C. Calculate the percent of the acid that has undergone ionization.
What is the value of q for the overall change from State A (through States B and C) to State D?
Give the strucures of the aldol products the form when each of the following compounds or mixtures is treated with NaOH.
What volume of oxygen gas at 25 degrees Celcius and 1.00 atm is produced from the decomposition of 22.33 mL of a 30.0% (by mass) solution of hydrogen peroxide?
A projectile is launched at an angle of 28 degrees above the horizontal and lands at the same level from which it was launched 2.70 seconds later. What is the magnitude of the initial velocity?
The absolute disintegration rate of this sample is measured as 1238 disintegrations per minute. Calculate the half-life (in years) of Sr-90.
According to Reference Table G, which substance forms an unsaturated solution when 80 grams of the substance is dissolved in 100 grams of H2O at 10°C?
An open-open organ pipe is 66.8 long. An open-closed pipe has a fundamental frequency equal to the third harmonic of the open-open pipe. How long is the open-closed pipe?
Suppose 240 mL of hydrogen gas is collected at 40.0 °C and has a total pressure of 1.03 atm by this process. how many grams of zinc must have reacted to produce this quantity?
The volume noted at 9.583 contains nitrogen gas under a pressure of 4.972 atm at 31.8 degrees celcius. Calculate the number of moles of nitrogen is in the tank.
What key assumption must be made about temperature-dependence. Calculate ΔG for unfolding of RNase A at 37 ºC. Is this process spontaneous at this temperature? Determine the melting tempe
Assuming that the pressure and amount of a gas sample remain constant, what will be the final volume of a 3 .84 L sample of a gas originally at 160 0C when heated to 280 0C.
Calculate the enthalpy change (in kJ) associated with the conversion of 25.0 grams of ice at -4.00 °C to water vapor at 106.0 °C. The specific heats of ice, water, and steam are 2.09 J/g&bu
Iron reacts with hydrochloric acid to produce iron (II) chloride and hydrogen gas. How many moles of HCl will react with 4.6 moles of Fe?
For hydrogen, what is the wavelength of the photon emitted when an electron drops from a 4d orbital to a 2p orbital in a hydrogen atom? The Rydberg constant is 1.097 x 10-2 nm-1.
Consider the dissociation of hydrocyanic acid in water: If the starting concentration of HCN is 0.50 M, what is the concentration of all species at equilibrium?
The calorimeter absorbs only a negligible quantity of heat capacity of the solution is 4.18J/celsius.g and that the density of the final solution is 1 g/mL, calculate the enthaply change per mole of