HC U5 Vocab

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Across
  1. 2. amount of matter stays the same, even when matter changes form
  2. 4. the number in front of the formula
  3. 7. substance specific identification group of atomic symbols and fixed ration subscripts
  4. 8. organic chemical compound that is composed exclusively of hydrogen and carbon atoms
  5. 10. symbolic representations of chemical reactions in which the reactants and the products are expressed in terms of their respective chemical formula
  6. 12. occur when parts of 2 ionic compounds are exchanged, making 2 new compounds
  7. 15. chemical process in which a substance reacts rapidly with oxygen and gives off heat
Down
  1. 1. a reaction in which one element is substituted for another element in a compound
  2. 3. an arrow that is placed after the reactant or reactants, points in direction of products
  3. 5. a positive or negative charge on a atom
  4. 6. rearrangement of the molecular or ionic structure of a substance, opposed to a change in physical form or a nuclear reaction
  5. 9. equations with simply the chemical formulas of the products and reactants, no mention of state
  6. 11. chemical equation where mass is conserved and there are equal numbers of atoms of each element on both sides of the equation
  7. 13. production of chemical compounds reaction from simpler materials
  8. 14. a reaction in which a compound breaks down into 2 or more substances