Tic-tac-toe crossword puzzle 24 words

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Across
  1. 2. change A change of one substance into another substance
  2. 6. The number written slightly below and to the right of a chemical symbol that shows how many atoms of an element are in a compound
  3. 8. change A usually reversible change in the physical properties of a substance, as size and shape
  4. 10. A substance that is present at the beginning of a chemical reaction, takes part in the reaction, and is changed into a new substance
  5. 12. A substance made up of two or more different types of atoms bonded together
  6. 13. An atom of one element that has a different number of neutrons than another atom of the same element
  7. 15. A negatively charged particle located outside of an atom’s nucleus about 2000 times smaller than either a proton or neutron
  8. 17. number The total number of protons in an atom’s nucleus
  9. 18. A combination of two or more substances that do not combine chemically, but remain the same individual substances
  10. 19. The number before a chemical formula indicating how many molecules are involved in a chemical reaction
  11. 22. of conservation of mass A scientific law stating that during a chemical reaction, matter is not created nor destroyed
  12. 23. A substance that is not uniform throughout
  13. 24. A neutral particle located in an atom’s nucleus
Down
  1. 1. A substance that increases the rate of a chemical reaction but is not consumed by the reaction
  2. 3. A group of atoms that are held together by covalent bonds so that they move together
  3. 4. A substance formed by a chemical reaction; made by the rearrangement of atoms and bonds in reactants
  4. 5. A positively charged particle located in an atom’s nucleus
  5. 7. A substance that increases the rate of a chemical reaction but is not consumed by the reaction
  6. 9. mass number The total number of protons and neutrons in an atom’s nucleus
  7. 11. A substance that cannot be broken down into a simpler substance by ordinary
  8. 14. A solid substance that forms as a result of a chemical reaction between chemicals in two liquids
  9. 16. A substance that is evenly spread throughout. Particles not distinguishable
  10. 20. a vertical column in the periodic table of the elements that have similar properties
  11. 21. a horizontal row in the periodic table of the elements that have varying properties