Chapter 7 - Chemical Reactions

123456789101112131415161718
Across
  1. 4. a compound breaks down into 2 or more simpler substances.
  2. 6. a process in which the substances exposure to each other increases
  3. 7. a reaction where forming bonds releases energy to the surroundings.
  4. 10. a substance reacts rapidly with oxygen.
  5. 11. Numbers that appear before a formula to show the relative proportions of each reactant and products.
  6. 14. Mass is neither created nor destroyed during a chemical reaction.
  7. 15. two different compounds exchange positive ions and form two new compounds.
  8. 16. substance that increases the reaction rate without being used up in the reaction.
  9. 17. the number of particles in a given volume of solution is called this
  10. 18. a reaction where breaking bonds requires energy and it absorbs energy from the surroundings.
Down
  1. 1. The new substance formed as a result of a change.
  2. 2. faster molecular motion causes rate of reaction to increase
  3. 3. The mass of the products if always equal to the mass of the reactants.
  4. 5. total energy before a reaction equals the total energy after a reaction.
  5. 8. the amount of surface available on a substance by crushing it or breaking it
  6. 9. two or more substances react to form a single substance.
  7. 10. Representation of a chemical reaction in which the reactants and products are expressed as formulas.
  8. 12. one element takes the place of another in a compound.
  9. 13. The substances that undergo change.