In one experiment a student placed 0.13 mL of a solution made from 0.299 g of unknown in 500.00 mL of pentane on a pan of water. After all the pentane evaporated a 26.03 cm2 monolayer of unknown remained on the surface of the water. If the density of the unknown was 0.761 g/mL what was the thickness of the monolayer in micrometers?

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.

For the reaction, 4 a(g) + 3 b(g) => 2 c(g), the following data were obtained at constant temperature. experiment initial[a],mol/l initial [b],mol/l initial rate,m/min 1 0.200 0.150 5.00 2 0.400 0.150 10.0 3 0.200 0.300 10.0 4 0.400 0.300 20.0 which of the following is the correct rate law for the reaction? 1. rate = k[a]2[b]2 2. rate = k[a][b] 3. rate = k[a]2[b] 4. rate = k[a][b]2

How do limiting factors most affect population size? ostop population growthrestrict population growthincrease population sizeresult in positive impactso