Chapter 2 Key Terms

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Across
  1. 2. System A system in which no matter is allowed to enter or leave
  2. 3. Anything that has mass and occupies space
  3. 4. A biological catalyst that lowers the activation energy of reactions in cells
  4. 6. Equation A short and easy way to show a chemical reaction using symbols
  5. 7. A substance formed as a result of a chemical reaction
  6. 9. Properties A characteristic of a substance that can be observed without changing the substance into another substance
  7. 11. Reaction A reaction that releases energy in the form of heat
  8. 13. A material that releases energy when it burns
  9. 16. Properties A characteristic of a substance that describes it ability to change into different substances
  10. 20. The amount of one material in a certain volume of another material
  11. 22. A substance that enters into a chemical reaction
  12. 24. A rapid reaction between oxygen and fuel that results in fire
  13. 25. A material that decrease the rate of the reaction
Down
  1. 1. A reaction in which one element replaces another in a compound or when two elements in different compounds trade places
  2. 5. A chemical reaction that breaks down compounds into simpler products
  3. 8. A number in front of a chemical formula in an equation that indicate how many molecules or atoms of each reactant and product involved in a reaction
  4. 10. A solid that forms from a solution during a chemical reaction
  5. 12. System A system in which matter can enter from or escape to the surroundings
  6. 14. Change A change that alters the form or appearance of a material but does not change the material
  7. 15. Energy The minimum amount of energy needed to get a chemical reaction started.
  8. 17. Reaction A reaction that absorbs energy in the form of heat
  9. 18. of Mass The principle stating that matter is not created or destroyed by a chemical reaction
  10. 19. A material that increases the rate of a reaction by lowering the activation energy
  11. 21. The study of the properties of matter and how matter changes
  12. 23. A chemical reaction in which two or more simple substances combine to form one or more complex substances
  13. 24. Reaction The process by which substances undergo chemical changes that result in new substances