Final answer:
A substance is a sample of matter with the same properties throughout. Water is an example of a substance that has the same properties, like boiling point and color, regardless of its location.
Step-by-step explanation:
A substance is a sample of matter that has the same physical and chemical properties throughout. In chemistry, there are two types of substances: elements and compounds. An example of a substance is water, which is a compound composed of the elements hydrogen and oxygen. Water has the same properties, such as boiling point and color, regardless of where it is found.