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Two astronauts are 1.60 m apart in their spaceship. One speaks to the other. The conversation is transmitted to earth via electromagnetic waves. The time it takes for sound waves to travel at 328 m/s through the air between the astronauts equals the time it takes for the electromagnetic waves to travel to the earth. How far away from the earth is the spaceship?
Make a graph of density (y) vs. concetration in mass% (x). Record the slope of y-intercept of the line
what is the correct electron configuration for Cr (chromium). Chose the proper Lewis dot structure for the compound or poliatomic ion: Sulfur Dioxide (SO2).
prepare 100 mL each of five standard solutions: 2.00 x 10-5, 5.00 x 10-5, 1.00 x 10-4, 2.00 x 10-4, and 5.00 x 10-4 M. These will serve as your analytical standards, which means that their phosphate concentrations must be precisely known.
Gastric juice is made up of substances secreted from parietal cells, chief cells, and mucous-secretig cells. The cells secrete HCl, proteolytic enzyme zymogens, mucin, and intrinsic factor. The pH of gastric juice is acidic, between 1-3.
An aqueous solution containing 35.8 g of an unknown molecular (nonelectrolyte) compound in 156.7g of water was found to have a freezing point of -1.4 degrees C. Calculate the molar mass of the unknown compound.
For the endothermic equilibrium CaCO3(s) + NH4^(+)(aq) + SO4^(2+)(aq) -> CaSO4(s) + NH3(g) + HCO3^(-)(aq), explain the best set of changes to apply in order to increase product yield effectively.
acalculate the equilibrium constant for the following reaction at ph7.0 and 25 degc using the indicated
Given the parent compound, draw the mass spectrum fragment that is observed at m/z 91. Include any hydrogen atoms and the charge.
Ethane is burned with 20% excess air in a furnace operating at a pressure of 100 kPa. Assume complete combustion occurs. Determine the dew point temperature of the flue gas.
In the near future, the college will attempt to reduce the cost of chemicals used in campus laboratories. One option suggests the chemistry department use household chemicals instead of expensive laboratory grade materials were ever possible.
A student is conductiong this experiment, but forgets to temper the lid. therefore it breaks while the hydrate is being heated. the student thinks carefully and replaces the old lid with a new one, collecting the following data. what is the percen..
Explain why OSHA requires employers to limit employee exposure to acetic acid vapors
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