Chemistry, 15.02.2021 17:10 zjthomas846
Em nosso dia a dia vivemos cercados de máquinas é muito comum nos depararmos com máquinas de todos os tipos desde a mais simples até as mais complexas denominamos máquinas simples como:
a)aquelas que seu funcionamento depende apenas de peças eletrônicas.
b)aquelas que dificultam a atividade humana na realização de tarefas.
c) aquelas que modificam em transmitir ações de uma força para realizar algum movimento.
d) aquelas que nos permitem realizar uma tarefa com maior esforço físico.
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Particles vibrate in a rigid structure and do not move relative to their neighbors.
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Which of the following shapes would represent a molecule with two bonded atoms and 3 lone pairs on only one of them , trigonal planar , bent , trigonal pyramidal , linear
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What is a difference between a mixture of elements and a mixture of compounds
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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
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