Crossword puzzle

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Across
  1. 4. phenomenon of light bouncing back after striking a surface
  2. 5. powerhouse of the cell is called ____
  3. 11. A substance that gives oxygen or removes Hydrogen in a chemical reaction
  4. 12. green pigment in plants that captures sunlight for Photosynthesis
  5. 13. Muscular pipe that connects mouth to stomach
  6. 15. In this reaction a more reactive element replaces a less reactive one
Down
  1. 1. Type of reaction where 2 or more reactants form a single product
  2. 2. Process of breaking down glucose to release energy in cells
  3. 3. Type of lens that converges light rays and is thicker in the middle
  4. 6. bending of light when it passes from one medium to another
  5. 7. Type of image that cannot be obtained on a screen and is formed by plane mirrors
  6. 8. A chemical reaction that absorbs heat
  7. 9. wave like movement in the alimentary canal that pushes food down
  8. 10. Point on the principal axis where parallel rays converge or appear to diverge after Reflection/Refraction
  9. 14. Gas evolved when a metal reacts with dilute acid