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At the BIG BANG the universe extended from a single point into a sphere of radius about five light years rather quickly. Approximate the entropy raise in the universe during the expansion under two different assumptions
a) First presume that at the Big Bang the diameter of the universe was one meter.
b) Now presume that at the Big Bang, the diameter was zero that is the universe was volume-less. Explain how does this demonstrate that we cannot know what the universe was like at the Big Bang, merely what is was like immediately after the Big Bang?
"Crossed" or "mixed" aldol condensations are practical for synthesis, if one of the aldehydes (or ketones) has no alpha-hydrogen atoms. Explain.
Presume 12.0 g of carbon (C) reacts with 65.0g of sulfur (S) to give 76.0 g of the compound carbon disulfide (CS2). In the process all the carbon gets used up, however some elemental sulfur is left over. For the law of conservation of matter to be..
Explain how to make a stock solution of 5.00 M NaCl, and then how to use this stock solution to make 2.5 ml of 0.10 M NaCl
Compute the ratio of the concentration of H 2 CO 3 to that of the HCO 3- if The pH of a bicarbonate-carbonic acid buffer is 8.50
What is the best and easy way to determine the frequency (in hz) of the interacting photon. A photon interacts with a ground state electron in a hydrogen atom and is absorbed.
If a 1.2 g sample of C3H6O is burned completely in excess oxygen to yield CO2 (g) and H2O (l) at 25 C, releasing 38.22 kJ of energy. Explain what is the enthalpy of formation of C3H6O
Really confused on calculating/finding the half-equivalence point in a titration curve. This was a lab experiment done in my chem lab. We added 0.0750 M NaOH to acetic acid (pipet 10.00mL of ~0.1M HCH3CO2 into the beaker and add 40mL of DI water).
a compound contain 60.87 carbon 4.38 hydrogen and 34.75 oxygen then determine its empirical formula?cof2carbonyl
a small bubble rises from the botton of a lake where the temperature and pressure are 4c and 3.0 atm to the waters
How much heat is needed to raise the temperature of 81.0 g of water from 34 degrees celsius to 9.0x10^1 degrees celsius
A bottle is labeled only "Compound B (C6H12)" and contains a colorless liquid. You have been called in as an expert to identify this compound from its spectra
Which of the following atoms has the smallest radius? At, Br, Ge, or Pb? The answer is Ge. Based on trends, wouldn't Br have a smaller atomic radius than Ge
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