Astudent is told that both energy and mass must be conserved in every chemical reaction. she measures the mass of hydrochloric acid and a zinc strip separately. she then places the zinc strip into the acid and bubbles form as the zinc looks like it disappears. the combined mass afterward is less than the original.
which of these can explain this result?
a) the student must have not measured the mass correctly.
b) the zinc disappears and therefore the mass is less after the reaction.
c) this is not a chemical reaction so the conservation laws do not apply.
d) the bubbles indicate that a gas is created and mass is lost as it escapes from the container.
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
Chemistry, 22.06.2019 23:00
What prefix multiplier is appropriate for reporting a measurement of 5.57 ×10−5 m?
Answers: 1
Chemistry, 23.06.2019 00:00
If many scientists conduct the same or similar experiments, and all obtain similar results, a can be written, which is a generally agreed-upon statement that explains and predicts how a natural phenomenon works.
Answers: 1
Astudent is told that both energy and mass must be conserved in every chemical reaction. she measure...
Mathematics, 10.09.2020 03:01
English, 10.09.2020 03:01
English, 10.09.2020 03:01
Mathematics, 10.09.2020 03:01
Arts, 10.09.2020 03:01
English, 10.09.2020 03:01
History, 10.09.2020 03:01
Computers and Technology, 10.09.2020 03:01