carterlewis02

11.03.2021 • 

Chemistry

Students held a six-mole strip of copper strip over a flame until a combustion began. Students were provided the balanced chemical
reaction for the combustion of copper and asked to describe the limiting
reactant.
2Cu + O2 + 2Cuo
Student Description of Limiting Reactant
Student 1 The limiting reactant is copper because all of the oxygen
combusted and the room still contained oxygen.
Student 2 The limiting reactant is oxygen because the oxygen will be
used up before the copper.
Student 3 The limiting reactant is copper because twice as much oxygen
is needed compared to oxygen.
Student 4 The limiting reactant cannot be determined because the
number of moles of oxygen was not known.
Which student correctly describes the limiting reactant?

Ответ:

mdg5605

18.01.2021

Chemistry

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Isotopes of bromine have same chemical properties because they have same number of electrons.

Isotopes have only different number of mass that does not affect it's chemical properties too much.

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