Paxton M crossword puzzle.

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Across
  1. 3. When two or more elements combined its forms ___
  2. 7. Two or atoms bonded together from a _____
  3. 11. The average kinetic energy in an collection of atoms is called its ____
  4. 13. Substance that cant be broken down further chemically are ___
  5. 14. A reaction that absorbs heat is a _______ reaction
  6. 16. when substance interact with each other and form new substance its a ____
  7. 18. The amount of matter in something is its _____
Down
  1. 1. Amount of space something takes up is its ____
  2. 2. when the same substance are attracted to each other its because of ____
  3. 4. The result of mixing reactants is the _____
  4. 5. A reaction that release heat is a ________ reaction
  5. 6. The smallest form of matter is an _____
  6. 8. The study of elements and how they interact with each other is ____
  7. 9. A mix of substance can be separated physically is a ____
  8. 10. Anything that has mass and takes up space is ___
  9. 12. the ability to do work of cause change is called _____
  10. 15. Substance that are used in a chemical reaction are called ____
  11. 17. You use a _____ that speeds up a chemical reaction