A substance is a chemical combination.
An oxide.
Chemical Formula
A shorthand representation of the composition of a substance using atomic symbols and numerical subscripts is called a chemical formula.
A chemical formula is a combination of chemical symbols and numbers that represent the elements and ratio of atoms present in a substance. It provides information about the type and number of atoms in each element that make up the compound.
A compound is the substance formed by the chemical combination of two or more elements in definite proportions. It has a unique chemical structure and properties different from its constituent elements.
A very short answer: a chemical (chemical compound, substance) is a combination of two or more chemical elements.
A chemical compound .
The product is called a Compound
When one substance or combination of substances undergo change to become another substance or substances
Chemical reaction
This is called synthesis, a combination chemical reaction that changes the chemical bonds in the substances.
mixture