Which of the following is true about microorganisms?
  a. 
microorganisms can have both beneficial and detrimental effects on other organisms.
  b. 
microorganisms never have any effect on other organisms.
  c. 
microorganisms can have only beneficial effects on other organisms.
  d. 
microorganisms can have only detrimental effects on other organisms

Consider the following system at equilibrium. caco3(s) ca2+(aq) + co32–(aq) the addition of which compound will cause a shift in equilibrium because of a common ion effect? ccl4 co2 cuso4 na2co3

Americium-241 undergoes fission to produce three neutrons per fission event. if a neutron-absorbing material is mixed in with this sample so that the rate of neutron production drops down to 1.8 neutrons per fission event, which will be effective at achieving a critical mass? check all that apply. remove a deflective shield surrounding the sample. remove absorbent material mixed in with the sample. compress the sample of americium-241.

How many grams of oxygen gas are contained in a 15 l sample at 1.02 atm and 28°c? show your work.