In oxidation-reduction (redox) reactions, electrons transfer between atoms. This means that they change oxidation numbers.
The sum of all oxidation numbers must equal the charge of the overall molecule.
The oxidizing agent is reduced.
pH is a measure of acidity. The higher the pH, the more acidic the solution.
Acid-base neutralization reactions occur when an acid and a base are added together. They undergo a double displacement reaction in which water and a salt form.
A hydrocarbon is a substance containing mostly (if not entirely) carbon and hydrogen.