Physical Science Sem. 2 Final Part 3

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Across
  1. 2. a substance that initiates or accelerates a chemical reaction without itself being affected
  2. 5. A subatomic particle that has no charge and that is found in the nucleus of an atom
  3. 6. Atoms of the same element that have different numbers of neutrons
  4. 8. a chemical reaction producing heat or light and the product is CO2 and H2O.
  5. 12. Bond that involves sharing a pair of electrons between atoms in a molecule. Two non-metals.
  6. 14. a chemical reaction. A + B -> AB
  7. 16. Energy is released and heat is felt
  8. 17. the new substances that are formed in a chemical reaction (right side)
  9. 18. How do you make an electromagnet stronger?
  10. 19. a column on the periodic table
  11. 20. A positively charged ion
  12. 21. Bond in which electrons are shared unequally
Down
  1. 1. A chemical reaction AB -> A + B
  2. 3. The large number before the symbol which shows many atoms, molecules, or formula units take part in a reaction
  3. 4. Energy is absorbed and cold is felt
  4. 7. A subatomic particle that has a positive charge and that is found in the nucleus of an atom
  5. 9. Electrons on the outermost energy level of an atom
  6. 10. the principle stating that matter is not created or destroyed during a chemical reaction
  7. 11. A chemical reaction. AB + CD -> AD + CB
  8. 13. Center of an atom
  9. 14. The small number after the symbol which tells how many atoms of an element there are.
  10. 15. a subatomic particle that has a negative charge
  11. 22. A negatively charged ion