redox
暂无描述。系统推荐的高质量记忆内容，适合每天坚持背诵学习。
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What does it mean to be oxidised?
Gain of oxygen, loss of hydrogen, loss of electrons
What does it mean to be reduced?
Loss of oxygen, gain of hydrogen, gain of electrons
What is a reducing agent?
Allows something else to be reduced
What is an oxidising agent?
Allows something else to be oxidised
What is an oxidation state?
Represents the total number of electrons that have either been accepted or removed from an element to get to its current form
What is the oxidation state of: oxygen in compounds, except peroxides oxygen in peroxides hydrogen in compounds, except metal hydrides hydrogen in metal hydrides group 1 metals in coompounds group 2 metals in compounds ?
-2 -1 +1 -1 +1 +2
What are the 7 rules to assign oxidation states?
• Uncombined elements (not in compounds have an oxidation state of 0 • In a binary compound, one element always has a positive oxidation state and the other has a negative oxidation state • Metals always have positive oxidation states • For simple ions, the oxidation state is the charge on the ion • The more electronegative element is assumed to take the electrons in the covalent bond and then the compound is treated like an ionic compound • The sum of the oxidation states in a compound is always 0 • The sum of the oxidation states of the atoms in a complex ion is the charge on the ion
What are metals?
Reducing agents - they are electron donors
What are non metals?
Oxidising agent - electron acceptors
What is the oxidising agent when two non metals react?
The more electronegative element
What are the 3 rules for constructing half equations?
• only one element in a half equation changes oxidation state • The half equation must balance in terms of atoms • The half equation must balance in terms of charge (electrons)