You are studying the reaction
A2(g) + B2(g) →→ 2AB(8)
to determine its rate law. Assuming that
you
have a valid exper-
imental procedure for obtaining [A2] and [B2] at various times,
explain how you determine (a) the initial rate, (b) the reaction
orders, and (c) the rate constant.
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Ответ:
The Mg element is the reducing agent and the Fe element is the oxidizing agent
Further explanationThe oxidation-reduction reaction or abbreviated as Redox is a chemical reaction in which there is a change in oxidation number
3 basic theories explain this Redox concept:
1. Binding/release of oxygenThe oxidation reaction is the binding of a substance with oxygen. (O₂)
For example:
2SO₂ + O₂ ----> 2SO₃
The reduction reaction is the release of oxygen from a substance.
For example:
2CuO → 2Cu + O₂
2. Electron release / binding reactionOxidation is an electron release event
Example:
2F ---> 2Fe³⁺ + 6e⁻
The reduction is an electron capture event
Example:
3O₂ + 6e⁻ ---> 3O²⁻
3. The reaction of addition/reduction of oxidation numberOxidation is an increase/increase in oxidation number, while reduction is a decrease in oxidation number.
In the redox reaction, it is also known
Reducing agents are substances that experience oxidation
The oxidizing agent is a substance that is reduced
The formula for determining Oxidation Numbers in general:
1. Single element atomic oxidation number = 0. Examples of Ar, Mg, Cu, Fe, N₂, O₂, etc. = 0
Group IA (Li, Na, K, Rb, Cs, and Fr): +1
Group IIA (Be, Mg, Ca, Sr and Ba): +2
H in compound = +1, except metal hydride compounds (Hydrogen which binds to IA or IIA groups) oxidation number H= -1, for example, LiH, MgH₂, etc.
2. Oxidation number O in compound = -2, except OF2 = + 2 and in peroxide (Na₂O₂, BaO₂) = -1 and superoxide, for example KO₂ = -1/2.
3 The oxidation number in an uncharged compound = 0,
Total oxidation number in ion = ion charge, Example NO₃⁻ = -1
Redox reactions are reactions that are accompanied by changes in oxidation numbers, so what must be examined is whether there are elements that experience changes in oxidation numbers in the reaction
Let's look at the reaction
Mg(s)+Fe²⁺(aq)→Mg²⁺(aq)+Fe(s)
Let see the change in the oxidation number of each element
Mg on the left = 0 (single element)
Fe²⁺ on the left = +2 ( ion charge)
Mg on the right = +2 ( ion charge)
Fe on the right = 0 (single element)
Means that the element Mg has increased oxidation number from 0 to +2 so that it experiences an oxidation reaction and acts as a reducing agent
While Fe has decreased the oxidation number from +2 to 0, so it has a reduction reaction and acts as an oxidizer
Learn morean oxidation-reduction reaction
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a reducing agent
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element is reduced
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Keywords: oxidation-reduction, an oxidizing agent, a reducing agent