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The best means of personal protection from radiation for emergency responders is the implementation of three basic principles: time, distance and shielding. Please show your work when answering the following questions:
a. Using the inverse square law of radiation, what Geiger counter reading would you get for a radioactive material when you are 3 feet from the source (assume an initial reading of 6300 R at a distance of 1 foot from the source)?
b. Dr. Brown has a radioisotope source containing 1.2 x 106 (also written as 1.2E+06) atoms of Plutonium-238 in 1985, how many atoms will remain in 352 years?
c. How many protons and neutrons are present in the plutonium-238 nucleus?
What was the temperature change of the metal? C) Calculate the specific heat and the atomic mass of the metal. What is the metal?
calculate the volume of water needed to dilute the anti-freeze from 0.20M in 0.260 litres to 0.13M.
Assume that the kinetic energy of a 1500 kg car moving at 150 km/h could be converted entirely into heat. What amount of water could be heated from 22C to 48C by the car's energy?
In a typical mass spectrum, a smaller signal is observed at a mass 1 amu higher than the molecular ion peak. Why? A) Due to small impurities in the sample
A buffer solution contains 0.386 M NH4Cl and 0.316 M NH3 (ammonia). Determine the pH change when 0.064 mol HBr is added to 1.00 L of the buffer
Explain why a buffer made of equal concentrations of CH3COOH and CH3COO- does not change in pH when a small amount of NaOH (a strong base) is added to the solution. Does the NaOH dissociate into ions when it is added to the solution?
When strontium bromide (SrBr2) is heated in a stream of chlorine gas, it is completely converted to strontium chloride
If 50 mL of the solution from part a is added to each of the beakers shown here(i through iv), in which beakers, if any, will a precipitate form? State water and mixture is allowed to come to equilibrium
how many ice cubes are needed to cool 500 g of water initially at 23 c to 0.0 c if each cube at 0.0 c contains one mole of water.
Assume that the heat required for the vaporization of the alcohol comes only from the aluminum block and that the alcohol vaporizes at 25. Suppose that 1.15 of rubbing alcohol evaporates from a 65.0 aluminum block.
calculate the final molarity of the solution that results when 125 ml of .200 M HCL is diluted to 1.00L
Presence of Aldehyde Group, An excellent way to identify the presence of an aldehyde group is by 1H NMR. The chemical shift of the aldehydic proton occurs in the 9-10-ppm region
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