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The sun is 93 million miles from earth. Explain how many minutes does it take for light to travel from the sun to the earth? The speed of light is 3.00 x 108 meters per second.
What causes the heating that is seen in the thermosphere? What causes the heating that is seen in the stratosphere? What is the biological importance of ozone in the stratosphere?
Which statement best desrcibes the energy change as bonds are formed and broken in this reaction ?
How many molecules of water are required to carry over 1 molecule of iodobenzene? How many grams of water per gram of iodobenzene?
for a reaction which has the temp of 298k delta g is positive and delta s is 9.0 jmol-k. what can be said about the
atomic masses. 6 pts an element has two naturally occurring isotopes isotope a has a mass of 120.9038 amu and a
a cylinder of compressed gas has a pressure of 4.882 atm on one day. the next day the same cylinder of gas has a pressure of 4.690 atm, and its temperature is 8 degrees celcius. what was the temperature on the previous day?
you determine the temperature of the mixed portions of water to be 45 oC. What is the heat capacity of the calorimeter
At what temperature degrees C will xenon atoms have the same average speed that Cl2 molecules have at 25 degrees C
How can you estimate the pH range of an indicator's color change? why do some indicators have two separate pH ranges?
A system is expanded against an external pressure of 2 atm, changing its volume from 10 to 35 L and absorbing 765 J as heat from the surroundings
which mixture would not be expected to be homogeneous. pentanol and hexane, KBr and water, acetic acid and methanol, ethylene glycol and water, octane and heptane
indicate whether each of the following solutions are acidic, basic, or neutral at 25 degrees C: a)[H3O^+]=6.0x10^-12 M b)[H3O^+]=1.4x10^-4 M c)[OH^-]=5.0x10^-12 M d)[OH^-]=4.5x10^-2 M
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