How many electrons are involved in a single covalent bond?

In the following redox reaction which is the oxidizing agent and which is the reducing agent? alcl3 + na nacl + al

This chart lists four kinds of polymers and their sources. what can be known about all four polymers, despite their differences? they come from living things. they share ionic carbon bonds. they are at least 100 monomers long. they are made of repeating subunits.

Identify the electromagnets with poles that are reversed from the electromagnet shown above