Chemistry, 19.10.2019 01:00, jojoangelique13
Pedro thinks that if he adds earthworms to a compost pile, it will decompose twice as fast as a compost pile without earthworms. pedro has designed an experiment to test his prediction. the steps of his experiment are shown below.
start two compost piles at the same time with the same materials.
add earthworms to one compost pile.
add fungi to the other compost pile.
judge the level of decomposition in each compost pile every week.
report the results.
which step in pedro's experiment would make it difficult for pedro to fairly compare the two compost piles?
a.
step 3
b.
step 1
c.
step 4
d.
step 2
reset submit
Answers: 2
Chemistry, 22.06.2019 10:00, zionlopez543
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.
Answers: 1
Chemistry, 22.06.2019 14:00, hammackkatelyn60
The content of manganese (mn) in steel was determined spectrophotometrically and with the use of the standard addition method. an unknown sample of mn from a digested steel sample gave an absorbance of 0.185 when analyzed spectrophotometrically. when 5.00 ml of solution containing 95.5 ppm mn was added to 50.0 ml of the unknown steel solution (digested sample), the absorbance was 0.248. calculate the concentration, in parts-per-million (ppm), of mn in the digested steel sample solution.
Answers: 3
Pedro thinks that if he adds earthworms to a compost pile, it will decompose twice as fast as a comp...
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