Question | Answer |
Modern definition of redox | Transfer of electrons (Reduction + Oxidation) |
What is oxidation? | Loss of electrons |
What is reduction? | Gain of electrons |
Early definition of oxidation? | Combining with oxygen |
What does OILRIG stand for? | Oxidation Is Loss Reduction is Gain |
What does an oxidising agent do? | `It oxidises something else and is itself reduced |
Chose the correct word: An oxidising agent is an electron acceptor/donor | Acceptor (has to be reduced itself) |
Chose the correct word: A reducing agent is an electron acceptor/donor | Donor (the thing that is oxidised) |
What is the guide to development of redox? | Electronegativity |
What is the oxidation state of any element and why? | 0 (zero). Because oxidation states refer to atoms in compounds. |
What does oxidation state or number refer to? | The number of electrons lost, gained or shared by an atom in a compound |
Oxidation state = ? | charge on ion (as this is the number of electrons lost or gained) |
What is the name of elements that nearly always have the same oxidation state in their compounds? | Fixed oxidation state |
What is the fixed oxidation state of elements in group 1? | +1 |
What is the fixed oxidation state of elements in group 2? | +2 |
What is the fixed oxidation state of Fluorine? | -1 |
What are charged compounds called? | Compound ions |
Define Oxidation | Oxidation is an increase in oxidation state (more positive or less negative) |
Define Reduction | Reduction is a decrease in oxidation state (less positive or more negative) |
Summarise in three points oxidation. | Gain of oxygen, loss of electrons, increase in oxidation number |
Summarise in three points reduction | Loss of oxygen, gain of electrons, decrease in oxidation number |
Is the oxidation state calculated per compound or atom? | Per atom |