A chemically pure substance is a substance that cannot be separated expect by chemical means. For instance, water can be broken down by electrolysis into oxygen and hydrogen. Yet, it is still a pure substance because a chemical change must occur in order for this to happen.
An element.
element
substances that cannot be broken down chemically into other substances are
An element.
It is an element, composed of atoms.
Robert Boyle
element
An element.
element
That would be an Element.
These are the chemical elements.
A pure substance that cannot be chemically broken down into simpler substances.
substances that cannot be broken down chemically into other substances are
A pure substance that cannot be broken down into simpler substances by physical or chemical means is an element. This is because Elements can't be broken down chemically into other substances because there is nothing to break them down into.
Elements.
A pure substance that cannot be broken down into simpler substances by physical or chemical means is an element. This is because Elements can't be broken down chemically into other substances because there is nothing to break them down into.
Elements can't be broken down chemically into other substances because elements are what make up other things such as sugar and water, they can't be broken down further because there is nothing to break them down into.