Science 2.0

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