Chemistry Vocabulary

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