Physical and Chemical Change Puzzle

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Across
  1. 3. The mass per unit volume of a substance.
  2. 4. The process by which a liquid changes into a gas.
  3. 6. A pure substance consisting of only one type of atom.
  4. 8. The distinct forms that different phases of matter take on, namely solid, liquid, and gas.
  5. 10. The ability of a substance to dissolve in another substance, typically a liquid.
  6. 12. A change that can be undone, returning the substance to its original state.
  7. 13. A solid that forms and settles out of a liquid mixture during a chemical reaction.
  8. 14. A characteristic of a substance that is observed during a chemical reaction (e.g., reactivity with acid, flammability).
  9. 16. A substance formed when two or more chemical elements are chemically bonded together.
  10. 17. A substance that takes part in and undergoes change during a reaction.
  11. 19. A group of atoms bonded together, representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction.
Down
  1. 1. The amount of space that a substance or object occupies.
  2. 2. A combination of two or more substances where each retains its own properties and can be separated by physical means.
  3. 5. A substance that increases the rate of a chemical reaction without itself undergoing any permanent chemical change.
  4. 6. A chemical reaction that absorbs energy from its surroundings.
  5. 7. Anything that has mass and takes up space.
  6. 9. The process by which a solid changes directly into a gas without first becoming a liquid.
  7. 11. A measure of the average kinetic energy of the particles in a substance.
  8. 13. A change in which no new substances are formed and which can often be reversed (e.g., changes in state, shape, or size).
  9. 15. A chemical reaction that releases energy to its surroundings.
  10. 18. The smallest unit of a chemical element that retains its chemical properties.