Chemistry, 09.12.2020 19:20 melinda12ms
Příklad:
Do hrnku s 200 g čaje jsme nasypali 5 g cukru (jeden sáček porco-
vaného cukru). Vypočítejte, kolik procent cukru roztok čaje obsahuje.
K výpočtům můžete použít kalkulátor (obr. 42a, b).
Answers: 2
Chemistry, 21.06.2019 15:40
What is the study of how matter and energy interact? a. biology b. physics c. planetary science d. chemistry
Answers: 1
Chemistry, 21.06.2019 18:30
Calculate the change in entropy if br2(l) is converted to br2(g). s° for br2(l) = 152.2 j/(mol•k) s° for br2(g) = 245.5 j/(mol•k) s° for br(g) = 175.0 j/(mol•k)
Answers: 3
Chemistry, 22.06.2019 06:00
Oxidation-reduction reactions (often called "redox" for short) are reactions that involve the transfer of electrons from one species to another. oxidation states, or oxidation numbers, allow chemists to keep track of these electron transfers. in general, one element will lose electrons (oxidation), with the result that it will increase in oxidation number, and another element will gain electrons (reduction), thereby decreasing in oxidation number. the species that is oxidized is called the reducing agent or reductant. the species that is reduced is called the oxidizing agent or oxidant. to sum up: oxidation = increase in oxidation state = loss of electrons = reducing agent reduction = decrease in oxidation state = gain of electrons = oxidizing agent part a which element is oxidized in this reaction? fe2o3+3co→2fe+3co2 enter the elemental symbol. view available hint(s) is oxidized part b which element is reduced in this reaction? 2hcl+2kmno4+3h2c2o4→6co2+2mno2+2kcl+4h2o enter the elemental symbol. view available hint(s) is reduced
Answers: 1
Chemistry, 22.06.2019 14:00
In the space, show a correct numerical setup for calculating the number of moles of co2 present in 11 grams of co2
Answers: 1
Příklad:
Do hrnku s 200 g čaje jsme nasypali 5 g cukru (jeden sáček porco-
vaného cukru). Vyp...
vaného cukru). Vyp...
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