Which pair of elements will form a covalent bond?
a. potassium and chlorine
b. aluminum...
Chemistry, 23.10.2019 18:30 jamiyacrawford7
Which pair of elements will form a covalent bond?
a. potassium and chlorine
b. aluminum and chlorine
c. carbon and sulfur
d. lithium and oxygen
Answers: 3
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Which of the following best describes the formation of plasma?
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What is the main reason why some developing countries fear the increase the free trade policies around the world?
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Chemistry, 22.06.2019 21:00
Which of these is an example of pseudoscience? a) predicting the time of sunrise based on data on position of earth b) predicting the date of the moon phases based on data on position of earth c) predicting eclipses based on the position of the sun and the moon d) predicting future events in a person's life based on the position of the moon
Answers: 1
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
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