When a chemical substance has either lost an electron or gained an oxygen?

When will le chatelier's principle come into effect? at the beginning of a reaction, when there are only reactants when a reaction has reached chemical equilibrium when a catalyst is added to a reaction mixture when a reaction is occurring but not yet at equilibrium

Why did southern business leaders want to increase the number of slaves

How does the presence of oxygen affect the chemical pathways used to extract energy from glucose?