Chemistry, 21.07.2019 10:30 santiagobermeo32
The radioactive element carbon-14 has a half-life of 5750 years. a scientist determined that the bones from a mastodon had lost 78.5% of their carbon-14. how old were the bones at the time they were discovered?
Answers: 1
Chemistry, 21.06.2019 15:50
Which of these reactions are redox reactions? check all that apply.cd + hcl → cdcl2 + h2cucl2 + na2s → 2nacl + cuscaco3 → cao + co2 2zns + 3o2 → 2zno + 2so2 ch4 + 2o2 → co2 + 2h2o
Answers: 3
Chemistry, 22.06.2019 07:30
What three things determine the shape and size of a puddle when water is poured out onto a surface
Answers: 2
Chemistry, 22.06.2019 11:40
Calculate the number of kilojoules to warm 125 g of iron from 23.5°c to 78.0°c.
Answers: 3
Chemistry, 22.06.2019 20:20
The characteristics of two different types of reactions are shown below: reaction a: electrons are gained by the atoms of an element. reaction b: protons are lost by the atom of an element. which statement is true about the atoms of the elements that participate in the two reactions? their identity changes in both reaction a and reaction b. their identity changes in reaction a but not in reaction b. their identity changes in reaction b but not in reaction a. their identity remains the same in both reaction a and reaction b.
Answers: 1
The radioactive element carbon-14 has a half-life of 5750 years. a scientist determined that the bon...
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