Matter is everywhere. Matter is anything that has mass and takes up space. Matter is anything that is regularly experiencing both chemical and physical changes. When chemicals react, the results may be small, large, or even very dramatic.
Chemical change is a primary way that matter on Earth changes from one form to another. Energy is involved in chemical and physical changes. When chemical or physical changes occur, the total amount of matter and energy remains the same; this is the Law of Conservation of Matter and Energy. Matter can change state in a physical change. Chemical changes occur when atoms are recombined into a new substance. Evidence of a chemical reaction may include color change, gas being given off, and heat or light being given off or absorbed. Changing the amount of energy in a chemical system alters the reaction rate. Changing the surface area and/or concentration of reactants changes the rate of chemical reaction.
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