Chapter 2 Terms

Edit Answers
12345678910111213141516171819202122232425
Across
  1. 3. the minimum amount of energy needed to get a chemical reaction started
  2. 5. the process in which substances undergo chemical changes that result in the formation of new substances
  3. 6. a chemical reaction that breaks down compounds into simpler products
  4. 9. a substance formed as a result of a chemical reaction
  5. 12. a system in which no matter is allowed to enter or leave
  6. 13. a material that decreases the rate of a reaction
  7. 16. a short and easy way to show a chemical reaction using symbols
  8. 17. a rapid reaction between oxygen and fuel that results in fire
  9. 19. a characteristic of a substance that can be observed without changing the substance into another substance
  10. 20. a solid that forms from a solution during a chemical reaction
  11. 22. the amount of one material in a certain volume of another material
  12. 23. a material that releases energy when it burns
  13. 24. a change that alters the form or appearance of a material but does not make the material into another substance
Down
  1. 1. a number in front of a chemical formula in an equation that indicates how many molecules or atoms of each reactant and product are involved in a reaction
  2. 2. a reaction in which one element replaces another in a compound or when two elements in different compounds trade places
  3. 4. a reaction that releases energy in the form of heat
  4. 7. anything that has mass and occupies space
  5. 8. a system in which matter can enter from or escape to the surroundings
  6. 10. a characteristic of a substance describes its ability to change into different substances
  7. 11. a substance that enters into a chemical reaction
  8. 14. the principle stating that matter is not created or destroyed during a chemical reaction
  9. 15. a chemical reaction in which two or more simple substances combine to form a new more complex substance
  10. 16. the study of the properties of matter and how matter changes
  11. 18. a reaction that absorbs energy in the form of heat
  12. 21. a material that increases the rate of a reaction by lowering the activation energy
  13. 25. a biological catalyst that lowers the activation energy of reactions in cells