Chapter 2 Key Terms

Edit Answers
1234567891011121314151617181920212223242526
Across
  1. 4. A chemical reaction in which two or more simple substances combine to form a new, more complex substance.
  2. 8. A reaction in which one element replaces another in a compound or when two elements in different compounds trade places.
  3. 12. The amount of one material in a certain volume of another material.
  4. 13. A solid that forms from a solution during a chemical reaction,
  5. 17. The study of the properties of matter and how matter changes.
  6. 18. A biological catalyst that lowers the activation energy of reactions in cells.
  7. 20. The principle stating that matter is not created or destroyed during a chemical reaction.
  8. 21. A material that releases energy when it burns.
  9. 22. A material that decreases the rate of a reaction
  10. 23. A short, easy way to show a chemical reaction, using symbols.
  11. 24. A substance formed as a result of a chemical reaction
  12. 25. The minimum amount of energy needed to get a chemical reaction started.
  13. 26. A change that alters the form or appearance of a material but does not make the material into another substance.
Down
  1. 1. The process in which substances undergo chemical changes that result in the formation of new substances.
  2. 2. A characteristic of a substance that can be observed without changing the substance into another substance.
  3. 3. A characteristic of a substance that describes its ability to change into different substances.
  4. 5. A system in which no matter is allowed to enter or leave.
  5. 6. 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.
  6. 7. A material that increases the rate of a reaction by lowering the activation energy.
  7. 9. A reaction that releases energy in the form of heat.
  8. 10. Anything that has mass and occupies space.
  9. 11. A rapid reaction between oxygen and fuel that results in fire.
  10. 14. A chemical reaction that breaks down compounds into simpler products.
  11. 15. A system in which matter can enter from or escape to the surroundings.
  12. 16. A substance that enters into a chemical reaction.
  13. 19. A reaction that absorbs energy in the form of heat.