Science Final Review

123456789101112131415161718
Across
  1. 4. acronym to help us remember indicators of a chemical reaction
  2. 6. materials or substances that occur on Earth and are formed solely through natural processes
  3. 10. any characteristic of a substance that can be observed without changing the substance
  4. 12. a chemical reaction that occurs in a closed system, where no matter can enter or leave the system
  5. 15. man-made products from natural resources
  6. 16. something that shows a chemical reaction has happened
  7. 17. resources which will run out or not be replenished in our lifetimes
  8. 18. anything that takes up space and has mass
Down
  1. 1. any characteristic of a substance that may be observed when it undergoes a chemical change
  2. 2. a small number written below and to the right of a chemical symbol to show how many atoms of that element are in a molecule
  3. 3. a change to a substance in which some of its properties change, but no new substance is formed
  4. 5. a number placed in front of a chemical formula to show how many molecules of that substance are involved
  5. 7. a chemical reaction that occurs in an open system, where matter can enter or escape from the system
  6. 8. substance that starts a chemical reaction and undergoes a chemical change to form new substances
  7. 9. new substance or material that is formed as the result of a chemical reaction
  8. 11. when substances mix or react to form completely new substances with different properties
  9. 13. a resource of which there is an endless supply because it can be replenished
  10. 14. the smallest unit of matter