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Radium-226, which undergoes the alpha decay, has a half-life of 1600yr. Determine the numbers of alpha particles are emitted in the 1.9 min by a 6.3-mg sample of 226Ra?
Suppose the temperature is 25degrees Celsius and a partial pressure of oxygen is the 0.21 atm. If a current of 2.1 * 10^5 A is to be drawn from a zinc-air system, what volume of the air would requir
Determine the emf under actual operating conditions when the partial pressure of the oxygen is 0.21 atm.
One plane flies 25mph faster than other. Determine airspeed of each plane if cities are 275 miles apart and planes pass each other after 40 minutes of flying time.
Discuss how would change the OH group on the glucose to methyl, CH3, groups affect its solubility in water? Determine what would be a good solvent for this molecule? Why?
Determine the numbers of grams of acetylene must be burned to form the enough heat to raise the temperature of 1.00 gal of water by the13.2°C if the process is79.0% efficient and assume the dens
A coffee-cup calorimeter which is having 65.0 g of water at the 71.2°C. A 15.0 g piece of metal at 20.2°C is placed in the calorimeter. The final temperature of the metal and the water is 69
Determine the numbers of grams of water are produced in the following reaction when you start with the 15 grams of methane and 100 grams of oxygen.
If the person looks down from top of building, find measure of angle between the end of shadow and vertical side of building? Suppose person's eyes are level with top of building.
Explain the change in energy of a neon atom when it emits a photon of this wavelength and the red color of neon signs is due to electromagnetic radiation of the 640 nm.
Determine in a detail that what volume of 0.250m ba (oh)2is required to totally react with the 100.0ml of a 0.500m solution of acid in ba (oh)2+ 2 hcl = bacl2 + 2 h2O
Find out the value for the rate constant, k when the rate of the reaction is 100.0 M/s and the [A2]= 0.5000M and the [B2] = 0.1000M.
In the positive triiodide-starch paper test, have the iodide atoms in the test paper been reduced or oxidized? Determine what type of reagent oxidizing or reducing will cause a positive test?
Determine what would be the expected product(s) from the bromination of (z)-stilbene? Calculate the relationship among the abomination products of the (z)- and (e)-stilbene.
The area of the square is directly proportional to square of its diagonal. If area of the square having the diagonal 16cm long is 128cm2, find area of the square having diagonal 24 cm long?
In the presence of a high concentration of Cl¯ ion the bromine undergoes addition to ethylene to give 1-bromo-2chloroethane, as well as 1,2-dibromoethane.
Discuss how much energy will be released when the 200.0 mL of 0.400 M HCl is mixed with the150.0 mL of 0.500 M NaOH when the enthalpy of neutralization for the reaction of a strong acid with a stro
Give the wavelength and wave number (incm-1) of the anti-Stokes line when a Raman spectrum of a compound was taken with the 480.0 nm excitation radiation, and a strong line was found at 510.0nm.
The dimensions of the sheet of paper can be represented by consecutive odd integers. If area of paper is 143cm2, determine dimensions.
The fluorescence intensity fluctuates among the 10,000 and 5000 counts per second in a FRET experiment designed to monitor conformational changes in T$ lysozyme.
How long does it take molecules produced in the cell nucleus to reach the walls of the cell at a distance 1.0 um, corresponding to the radius of the cell?
An ordinary aspirin tablet contains 5 grains of a spirin ; the rest being binder and filler. As little as 10g of aspirin in a single dose has been found to be lethal. On
What type of reaction would you suspect that bleach is doing to the colored organic compounds that cause the stains? Bleach is used to remove the colored stains from clothing.
Discuss how much time is needed for a 5.66-mg sample of 51Cr to decay to 1.30mg if it has a half-life of 27.8 days? Radium-226, which undergoes alpha decay, has a half-life of 1600yr.
Average monthly temperature in Phoenix, Arizona, in degrees Fahrenheit. Determine average temperatures for March, July, and October, rounding to nearest whole degree.