when substances are combined it is sometimes called a mixture.
a compound
a synthesis reaction
This is called a compound.
Its a chemical change, and the simplest is when two atoms combine to from a compound. When there is a single oxygen atom, it is called ozone, then two combine in an ionic bond, they are an oxygen molecule.
mixture
When two or more substances are combined, it can be called either a compound or a mixture. A compound is a substance that contains two or more elements chemically bonded together, while a mixture is a physical combination of two or more substances that are not chemically bonded.
synthesis reaction
Synthesis.
synthesis reaction
chemistry
These substances form a mixture.
i have no idea :)