Chapter 5 Vocabulary: Physical and Chemical Changes 1. Chemical change-a change in matter that produces new kinds of matter with different properties. 2. Chemical reaction-another name for a chemical change 3. Dissolve-to mix completely by separating into particles that cannot be seen 4. Energy-the ability to cause change 5. Heat-the flow of thermal energy from a warmer area to a cooler area 6. Mixture-matter made up of two or more substances that are combined physically 7. Physical change-a change in the way matter looks without changing it into a new kind of matter 8. Product-the newly formed matter in a chemical reaction 9. Reactant-the matter that you start with in a chemical reaction 10.Solution-a mixture in which the particles of one kind of matter are nixed evenly with the particles of other kinds of matter 11.Temperature-a measure of how hot or cold matter is 12.Thermal energy- the total energy of particles of matter