Question

Укажите какой элемент окисляется и какой восстанавливается в реакциях между простыми веществами: а)Cr+O2=Cr2O3 б)Cl2+O2=Cl2O7 в)Al+Br2=AlBr3 г)Co+HCl=CoCl2+H2

Answer 1

а)Cr+O2=Cr2O3 хром окисляется, кислород восстанавливается

б)Cl2+O2=Cl2O7хлор окисляется, а кислород восстанавливается

в)Al+Br2=AlBr3  алюминий окисляется, а бром восстанавливается

г)Co+HCl=CoCl2+H2кобальт окисляется, а водород восстанавливается

Answer 2

Oxidation-Reduction Reactions and Element Changes

In the given reactions between simple substances, it's important to identify which elements are being oxidized and which are being reduced.

a) Cr + O2 = Cr2O3 - In this reaction, chromium (Cr) is being oxidized, and oxygen (O2) is being reduced. - Chromium is going from an oxidation state of 0 to +3, indicating oxidation, while oxygen is going from an oxidation state of 0 to -2, indicating reduction.

b) Cl2 + O2 = Cl2O7 - In this reaction, chlorine (Cl2) is being oxidized, and oxygen (O2) is being reduced. - Chlorine is going from an oxidation state of 0 to +7, indicating oxidation, while oxygen is going from an oxidation state of 0 to -2, indicating reduction.

c) Al + Br2 = AlBr3 - In this reaction, aluminum (Al) is being oxidized, and bromine (Br2) is being reduced. - Aluminum is going from an oxidation state of 0 to +3, indicating oxidation, while bromine is going from an oxidation state of 0 to -1, indicating reduction.

d) Co + HCl = CoCl2 + H2 - In this reaction, cobalt (Co) is being oxidized, and hydrogen (H2) is being reduced. - Cobalt is going from an oxidation state of 0 to +2, indicating oxidation, while hydrogen is going from an oxidation state of 0 to +1, indicating reduction.

These reactions involve the transfer of electrons between elements, leading to changes in their oxidation states and demonstrating the principles of oxidation-reduction chemistry.

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