Ch. 11 Vocab - Chemistry I

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Across
  1. 4. - small whole numbers that are placed in front of the formulas in an equation in order to balance it
  2. 7. -chemical equation that does not indicate the relative amounts of the reactants and products
  3. 8. -representation of a chemical reaction
  4. 9. -a chemical change in which two or more substances react to form a single new substance
  5. 10. -a chemical change involving an exchange of positive ions between two compounds
  6. 11. - a chemical change in which an element or a compound reacts with oxygen, often producing energy in the form of heat or light
Down
  1. 1. -in which each side of the equation has the same number of atoms of each element and mass is conserved
  2. 2. -a chemical change in which a single compound breaks down into or more simpler products
  3. 3. -a chemical change in which one element replaces a second element in a compound
  4. 5. -lists metals in order of decreasing activity
  5. 6. -a substance that speeds up the reaction but is not used up in the reaction