Next time, try wikipedia first before posting here. you'll save yourself time. this is from the very first line of the wikipedia article for "compound":
A chemical compound is a pure chemical substance consisting of two or more different chemical elements that can be separated into simpler substances by chemical reactions.
mixture is separted by physic changes and compound is broken down by chemical changes
The type of chemical reaction where a compound is broken down into smaller substances is called a decomposition reaction. In this reaction, a single compound is broken into two or more simpler compounds or elements.
By: a(n) Chemical Changes
Yes. that is how the compounds are formed. By combination of the elements.
Hexane is a compound. All chemical compounds can be broken down by chemical change (chemical reactions of many types) - not only hexane. All the other choices are elements which cannot be broken down by chemical changes.
They can be broken down by chemical changes, or they form simpler compounds.
Chemical Change
Yes, a chemical change can involve the formation of new compounds by rearranging atoms in the reactants. The products of a chemical reaction are often different substances with unique chemical properties compared to the original reactants.
A compound
It is a physical change, the chemical form remain unchanged.
It is no longer that same substance. A chemical changes the identity of the substance. Individual atoms cannot be broken down into smaller parts by normal physical or chemical change.
of course, by the intermediate of chemical reactions