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At the rock concert the sound intensity level 5m from the podium is 105d8.
The maximal value of the sound intensity level which does not permanently damage hearing is 85 dB.
How far from the podium one has to go to be in the safe distance?
What is a balanced equation to represent the formation of the precipitate formed between lead (II) and chloride
A sheet of gold weighing 8.5 g and at a temperature of 11.0 degrees C is placed flat on a sheet of iron weighing 21.0 g and at a temperature of 56.9 degrees C. What is the final temperature of the combined metals
a plant manufacturing nails and screws uses a large pool volume 10000 l to collect and treat its residual waste water
how much energy is required to heat an iron nail with a mass of 7g from 25 degrees celcius until it becomes red hot at
A solid contains X, Y, Z atoms in a cubic lattice with X atoms in the corners, Y atoms in the body-centered positions, and Z on the faces of the cell. if we write the empirical formula of the compound as XaYbZc, what are the values of the coeffiec..
Ammonia is produced using the Haber process in which nitrogen and hydrogen combine. N2(g) + 3H2(g) => 2NH3(g) How many grams of nitrogen are needed to produce 650 grams of ammonia
a student in lab has 3.00 g of pure n2 in 0.541 g pure h2. the reaction happens following this equation n2g 3h2g rarr
In the laboratory a student combines 25.5 mL of a 0.203 M sodium nitrate solution with 24.3 mL of a 0.375 M manganese(II) nitrate solution.
What is the heat of reaction (kJ) per mole of acid? Assume the mixture has a specific heat capacity of 4.18 J/(g·K) and that the densities of the reactant solutions are both 1.00 g/mL.
or a certain reaction kc2.2104 and kf0.284 m-2 s-1. calculate the value of the reverse rate constant kf given that the
The rate of bacterial hydrolysis of fish muscle is twice as great at 2.2 degrees C as at -1.1 degrees C. Determine the activation energy for this reaction.
Compute the concentrations of all species in a 1.25 M Na2SO3 sodium sulfite solution. The ionization constants for sulfurous acid are Ka1 = 1.4× 10-2 and Ka2 = 6.3× 10-8.
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