24 vocab

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Across
  1. 2. An atom of group of atoms that has a positive or negative electric charge; forms by gaining or losing electrons.
  2. 3. a scientific law stating that during a chemical reaction matter is not created or destroyed
  3. 4. A usually reversible change in the physical properties of a substance, as size and shape.
  4. 7. a combination of two or more substances. That do not combine chemically but remain the same individual substances
  5. 8. a vertical column in the periodic table of elements that have similar properties.
  6. 11. a substance made up of two or more different types of atoms bonded together
  7. 13. A neutral particle located in an atom’s nucleus.
  8. 16. a substance that cannot be broken down into a simpler substance by ordinary chemical changes
  9. 18. The number before a chemical formula indicating how many molecules are involved in a chemical reaction.
  10. 21. The total number of protons in an atom’s nucleus.
  11. 23. A negatively charged particle located outside of an atom’s nucleus about 2000 times smaller than either a proton or neutron.
  12. 24. A substance formed by a chemical reaction; made by the rearrangement of atoms and bonds in reactants.
Down
  1. 1. The total number of protons and neutrons in an atom’s nucleus.
  2. 5. a substance that is not uniform throughout.
  3. 6. A solid substance that forms as a result of a chemical reaction between chemicals in two liquids.
  4. 9. a substance that is evenly spread throughout particles not distinguishable
  5. 10. An atom of one element that has a different number of neutrons than another atom of the same element.
  6. 12. a substance that is present at the beginning of a chemical reaction takes. Part in the reaction and is changed into a new substance
  7. 14. A change of one substance into another substance.
  8. 15. a horizontal row in the periodic table of the elements that have similar properties.
  9. 17. A group of atoms that are held together by covalent bonds so that they move together.
  10. 19. A positively charged particle located in an atom’s nucleus.
  11. 20. 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.
  12. 22. A substance that increases the rate of a chemical reaction but is not consumed by the reaction.