Basic definition.
A compound is formed when two or more different elements are chemically combined.
A substance can describe a mixture of elements or compounds.
The substance formed by the chemical combination of two or more elements is a compound.
Wood is a material (substance) not a chemical compound (it is not a pure substance made of one compound) and surely it is not a change at all, neither chemical nor physical.
A compound.A compound is composed of elements. If you were to break down a compound you would get new compounds or elements.
A good note is to remember a chemical substance is a pure form of matter. A chemical element is pure chemical substance consisting of once type of atom distinguished by it's atomic number (quantity of protons within an atom's nucleus.)Where as a chemical compound is a pure chemical substance consisting of two or more chemical element.
A mixture or a substance (Compound) - yes; an element - not.
The Chemical compound that is the major substance of chromosomes are proteins.
The substance formed by the chemical combination of two or more elements is a compound.
compound
The identity of a substance (chemical compound) is defined by his chemical formula and molecular structure.
Wood is a material (substance) not a chemical compound (it is not a pure substance made of one compound) and surely it is not a change at all, neither chemical nor physical.
A compound. A compound can be covalent or ionic depending on which elements are bonding.
The substance is a compound, which forms chemical bonds that cannot be physically separated, but only by a chemical change.
A compound is a chemical substance containing in the molecule two or more different chemical elements.
Substance A is an element, substance Z is a compound.
A compound.A compound is composed of elements. If you were to break down a compound you would get new compounds or elements.
If something is not a mixture then it is a pure substance, either an element or a compound.
Glucose is one important chemical substance used in photosynthesis. It is used for food, a sugar compound.