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Diffraction of a wave through an opening may be observed when its wavelength is comparable (to within a factor of 100) to the dimensions of the opening. Consider directing beams of baseballs and positrons onto a crystal, where the 1-2 Å distance between planes of atoms is akin to a diffraction slit. Comment on the possibility of seeing wavelike effects from either the baseball or the positron.
he temperature of 55.6 grams of a material decreases by 14.8 degrees C when it loses 3080 J of heat. What is its specific heat?
what mass of this substance must evaporate in order to freeze 230g of water initially at 16 degrees? the heat of fusion
a 3.00 l helium balloon initially at stp floats up to an altitude of 10 km where the pressure is 200.0 torr and the
if in a certain experiment over a specific time period 0.0048 mol ph3 is consumed in a 2.0-l container each second of
a 3.00 l flask is filled with gaseous ammonianh3. the gas pressure measured at 20.0 degrees c is 1.95 atm. assuming
Calculate deltaU of a gas for a process in which the gas absorbs 18J of heat and does 6J of work by expanding.
Arsine (AsH3) has a vapor pressure is 35 Torr at -111.95?C and 253 Torr at -83.6 ?C. What is the normal boiling point of arsine.
When limestone (calcium carbonate) is heated it decomposes to form lime (calcium oxide) and carbon dioxide. A. write a balanced chemical equation for this reaction
Carry out the following operations, and express the answer with the appropriate number of significant figures. a) 320.5 - (6104.5/2.3) b) [(285.3 x 10^5) - (1200 x 10^3)] x 2.8954
A man has 50 kg of lipids and eats 1 kg of fish a day, which contains 0.5 ppm of methylmercury. What concentration of methylmercury will his lipids achieve?
When 1.150 grams of an unknown nonelectrolyte dissolves in 10.0 grams of water, the solution freezes at -2.16°C. What is the molecular weight of the unknown compound
In each of the following groups of substances, pick the one that has the given property. Explain your reasoning for each.
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