Bonding and Reactions

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Across
  1. 3. The substances formed during a chemical reaction.
  2. 4. A reaction in which a single compound breaks down into two or more elements or compounds.
  3. 8. Elements in the same _______ on the periodic table have the same number of valence electrons.
  4. 9. A _______ replacement reaction occurs when the atoms of one element replace the atoms of another element.
  5. 10. A _______ replacement reaction is when an exchange of ions occurs between two compounds.
  6. 13. Type of bond formed when one or more electrons are transferred from one atom to another.
  7. 14. Ionic bonds form between _____ and nonmetals.
  8. 16. A substance that slows down a chemical reaction.
  9. 17. A mixture of two or more metals that has different properties.
  10. 18. A positive ion.
  11. 19. A reaction that releases energy.
  12. 21. One of the signs that a chemical reaction occurred _________ change..
  13. 22. Type of bond that forms when numerous electrons are shared between atoms creating a “sea” of electrons.
  14. 23. Bonding occurs so that an element can get _______ valence electrons.
  15. 24. A negative ion.
  16. 25. Covalent bonds only form between __________.
  17. 26. A chemical reaction in which two or more substances react to produce a single product.
Down
  1. 1. A solid produced during a chemical reaction in a solution.
  2. 2. The number written after an element indicating how many atoms there are.
  3. 5. This number indicates the charge and number of electrons gained or lost.
  4. 6. A substance that speeds up a chemical reaction.
  5. 7. A reaction where Oxygen combines with a substance and releases energy.
  6. 8. The production of this might be a sign that a chemical reaction occurred.
  7. 11. A change in ______ is one of the signs that a chemical reaction occurred (temperature, light, sound).
  8. 12. A reaction that absorbs energy.
  9. 15. The starting substances in a chemical reaction.
  10. 18. A bond formed when electrons are shared between atoms.
  11. 20. The number written in front of a reactant or product.