Ch. 4 Vocab - Science 8

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Across
  1. 4. An orderly, three-dimensional arrangement of ions.
  2. 6. A reaction in which the energy released as the products form is greater than the energy required to break the bonds of the reactants.
  3. 8. The attraction between two oppositely charged ions.
  4. 9. A group of neutral atoms joined by covalent bonds.
  5. 11. A(n) _________ ion is more than one atom that together have an overall positive or electric charge.
  6. 12. A change in matter that produces one or more new substances.
  7. 13. The force of attraction that holds atoms together as a result of the arrangement of the electrons between them.
  8. 16. The attraction between nonmetal atoms as they share electrons.
  9. 17. Any change that alters the form or appearance of a substance without changing it into a different substance.
  10. 19. The symbol for an element surrounded by dots that represent valence electrons.
  11. 22. Two oppositely charged ions bonded together with a neutral charge.
  12. 25. An atom or group of atoms that have an electric charge.
  13. 27. A covalent bond in which electrons are shared equally.
  14. 29. A covalent bond in which 3 pairs of electrons are shared.
  15. 30. A reaction in which two or more elements or compounds combine to make a more complex substance.
  16. 31. When matter can enter from or escape to the surroundings during a reaction.
Down
  1. 1. The law of conservation of ______ states that during a chemical reaction, matter is not created or destroyed.
  2. 2. A covalent bond in which electrons are shared unequally.
  3. 3. Numbers that tell you the ratio of elements in a compound.
  4. 5. _____________ electrons have the highest energy levels, and are involved in chemical bonding.
  5. 7. A reaction that occurs when one element replaces another, or when two elements trade places.
  6. 10. When matter cannot enter or leave a reaction.
  7. 14. A reaction that occurs when compounds break down into simpler substances.
  8. 15. a compound that is made up of covalently bonded molecules.
  9. 18. The new substances that form from a reaction.
  10. 20. A group of symbols that shows the ratio of elements in a compound.
  11. 21. A number placed in front of a chemical formula in an equation.
  12. 23. Substances that undergo the chemical changes.
  13. 24. A covalent bond in which 2 pairs of electrons are shared.
  14. 26. A reaction in which the energy required to break the bonds of the reactants is greater than the energy released by the formation of the products.
  15. 28. A solid that forms from liquids during a chemical reaction.