Chapter 8 vocab

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Across
  1. 2. molecule that contains at least one unpaired electron
  2. 5. is a reaction in which one element is substituted for another element in a compound.
  3. 6. a substance that increases the rate of a chemical reaction without itself undergoing any permanent chemical change.
  4. 8. a biological catalyst and is almost always a protein.
  5. 9. any chemical reaction that absorbs heat from its environment. The absorbed energy provides the activation energy for the reaction to occur. A hallmark of this type of reaction is that it feels cold.
  6. 11. the substance on which an enzyme acts.
  7. 12. a chemical reaction between substances, usually including oxygen and usually accompanied by the generation of heat and light in the form of flame.
  8. 13. The species formed from chemical reactions. During a chemical reaction, reactants are transformed into products after passing through a high energy transition state.
  9. 15. a type of chemical reaction that involves a transfer of electrons between two species.
  10. 17. A process that involves rearrangement of the molecular or ionic structure of a substance, as opposed to a change in physical form or a nuclear reaction.
Down
  1. 1. a reaction in which the positive and negative ions of two ionic compounds exchange places to form two new compounds.
  2. 3. two or more chemical species combine to form a more complex product
  3. 4. the ratio between the amounts in moles of any two compounds involved in a chemical reaction
  4. 6. the symbolic representation of a chemical reaction in the form of symbols and formulas
  5. 7. When a chemical reaction happens, energy is transferred to or from the surroundings. When energy is transferred to the surroundings, and the temperature of the surroundings increases.
  6. 10. process by which electric current is passed through a substance to effect a chemical change. The chemical change is one in which the substance loses or gains an electron
  7. 14. A substance that takes part in and undergoes change during a reaction.
  8. 16. a reaction in which a compound breaks down into two or more simpler substances.