Matter is everything around you. Atoms and molecules are all composed of matter. Matter is anything that has mass and takes up space. If you are new to the idea of mass, it is the amount of stuff in an object. We talk about the difference between mass and weight in another section. Matter is sometimes related to light and electromagnetic radiation. Even though matter can be found all over the Universe, you will only find it in a few forms on Earth. You should know about solids, liquids, gases, plasmas, and one state called the Bose-Einstein condensate (BEC). What makes a state of matter? Molecules can move from one physical state to another (phase change) and not change their basic structure. So you're asking, "What is a chemical change?" Chemical changes occur when the bonds between atoms in a molecule are created or destroyed.
Related: Science sequence
• change to matter