Chemistry, 27.06.2019 02:00 robert7248
The half-life for the process 238uโ206pb is 4.5ร109 yr. a mineral sample contains 61.0 mg of 238u and 15.5 mg of 206pb. part a what is the age of the mineral
Answers: 3
Chemistry, 22.06.2019 00:10
Which of the following best describes the formation of plasma?
Answers: 1
Chemistry, 22.06.2019 18:30
The table lists the lattice energies of some compounds.compoundlattice energy (kj/mol)lif โ1,036licl โ853naf โ923kf โ821nacl โ786which statement about crystal lattice energy is best supported by the information in the table? the lattice energy increases as cations get smaller, as shown by lif and kf.the lattice energy increases as the cations get larger, as shown by lif and licl.the lattice energy decreases as cations get smaller, as shown by nacl and naf.the lattice energy decreases as the cations get smaller, as shown by naf and kf.
Answers: 3
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 04:20
Which activity describes an application of topographic maps? check all that apply. recreation, such as camping and hiking engineering, such as the construction of roads and buildings science, such as mapping stars in the sky business, such as analyzing population centers science, such as analyzing surface features
Answers: 1
The half-life for the process 238uโ206pb is 4.5ร109 yr. a mineral sample contains 61.0 mg of 238u an...
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