Chemistry, 27.09.2019 18:00 hcarcel8287
Ancient cyanobacteria released which assisted in creating the atmosphere as we know it today.
a. lead
b. hydrogen
c. ore
d. oxygen
Answers: 1
Another question on Chemistry
Chemistry, 22.06.2019 19:10
Δu of , in kj/kg, as it isto k, (a)as a of , (b) at , (c) at .
Answers: 2
Chemistry, 22.06.2019 21:40
Tooth enamel consists mainly of the mineral calcium hydroxyapatite, ca_10(po_4)_6(oh)_2. trace elements in teeth of archaeological specimens provide anthropologist with clues about diet and diseases of ancient people. students at hamline university measured strontium in enamel from extracted wisdom teeth by atomic absorption spectroscopy. solutions with a constant total volume of 10.0 ml contained 0.726 mg of dissolved tooth enamel plus variable concentrations of added sr. added sr find the concentration of sr in the 10 ml sample solution in parts per billion = ng/ml. find the concentration of sr in tooth enamel in parts per million = mu g/g.
Answers: 2
Chemistry, 23.06.2019 04:31
How does a sample of helium at 15 degree celsius compare to a sample of helium at 215 k? a) the helium at 15 degrees celsius has a higher average kinetic energy that the sample at 215 k. b) the helium at 15 degrees celsius has lower nuclear energy that the sample at 215 k. c) the helium at 15 degrees celsius has slower- moving atoms that the sample at 215 k. d) the helium at 15 degrees celsius has smaller atoms than the sample at 215 k.
Answers: 1
You know the right answer?
Ancient cyanobacteria released which assisted in creating the atmosphere as we know it today.
Questions
History, 11.07.2019 19:40
Biology, 11.07.2019 19:40
Computers and Technology, 11.07.2019 19:40
English, 11.07.2019 19:40
Mathematics, 11.07.2019 19:40
Mathematics, 11.07.2019 19:40
History, 11.07.2019 19:40
History, 11.07.2019 19:40
