Topic 3: Redox 1 Flashcards
What does oxidation number mean?
A number that indicates how many electrons it has gained or lost.
How to calculate the oxidation number?
Allocation of oxidation number to a species follows a number of rules: The oxidation number of an element is zero. Oxidation numbers in a neutralcompound add up to zero. Oxidation numbers in a charged compound add up to total the charge.
What does oxidation mean in terms of oxidation number?
Oxidation is the gain of electrons. When losing electrons, the oxidation numbers increases.
What does reduction mean in terms of oxidation number?
Reduction is the gain of electrons. When gaining electrons, the oxidation number decreases.
What is a disproportion reaction?
It is a reaction that involves an element in a single species being reduced and oxidised at the same time
What is a good way to classify reactions that have redox and disproportion
The use of oxidation numbers
How is an oxidation number of an element in a compound or ion indicated?
Using Roman numerals
What happens when metals lose electrons?
They form positive ions with an increase of oxidation number
What happens when non-metals gain electrons?
They form negative ions with a decrease in oxidation numbers