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Photosynthesis

Photosynthesis. Chemistry Style Monday, October 1st. Photosynthesis. The process where plants make their own food Plants are autotrophic Auto = by itself (think automatic) Trophic = feeding Uses sunlight, carbon dioxide, and water. Chemical Equations.

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Photosynthesis

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  1. Photosynthesis Chemistry Style Monday, October 1st

  2. Photosynthesis • The process where plants make their own food • Plants are autotrophic • Auto = by itself (think automatic) • Trophic = feeding • Uses sunlight, carbon dioxide, and water

  3. Chemical Equations • This is a way of showing the before and after of a chemical reaction • The reactants are always first (on the left of the arrow) • The arrow tells us that something is happening • The products are always last (on the right of the arrow)

  4. Reactants of photosynthesis Today we are going to make the reactants for photosynthesis. Reactants can be the “ingredients” that are mixed together to make something new. Reactants can also be one thing that ends up breaking apart to make some new things.

  5. Time to build! Use the following diagram to make some molecules: Make 6 of these Make 6 of these

  6. In your notes: • Write the chemical formula for each molecule. • Add the coefficient for each molecule (how many did you make?) Double check with your group to make sure you all have it correct. • Write down the elements you have • Count how many atoms of each element you have

  7. Reactants You have just analyzed the reactants for photosynthesis. You should have the following answers: • 6H2O and 6CO2 • Hydrogen: 12 Oxygen: 18 (6 from water and 12 from carbon dioxide) Carbon: 6

  8. Chemical Reaction These 2 reactants come together and using sunlight, make the products of photosynthesis. The beginning of the photosynthesis equation looks like this: 6H2O and 6CO2  Reactants Sunlight Yields

  9. Products The products are what is made; the end result. In order for something new to be made, the bonds of the molecules are broken and they recombine with the other atoms to make something new. Gently take apart your 12 molecules Make sure you keep them in same color groups

  10. Products of photosynthesis Plants are autotrophic – they make their own food. Their food is sugar: glucose. They also make a gas: oxygen Gas production!

  11. Time to Build! Build the following products of photosynthesis using the gum drops you took apart. Only make 1 of these  Make 6 of these:

  12. In your notes: • Write the chemical formula for each molecule. • Add the coefficient for each molecule (how many did you make?) Double check with your group to make sure you all have it correct. • Write down the elements you have • Count how many atoms of each element you have

  13. Products • You have just analyzed the products for photosynthesis. • You should have the following answers: • C6H12O6 and 6O2 • Carbon: 6 atoms • Hydrogen: 12 atoms • Oxygen: 18 atoms

  14. The Entire Equation Write the entire equation out in your notes: 6H2O and 6CO2 C6H12O6and 6O2 Complete the following: Carbon: Carbon: Hydrogen: Hydrogen: Oxygen: Oxygen: What do you notice about the atoms on each side?

  15. Law of Conservation of Mass You have just identified an example of the Law of Conservation of Mass Write your own definition for the law on the note card you have been given. Place the note card on a piece of notebook paper. Be ready to read & comment on at least 2 others. You will write your comments on the note book paper. Wait for the signal to move!

  16. Law of Conservation of Mass • Matter is not created nor destroyed. It just changes form. • We did not have to add any atoms  it just changed • Atoms of elements MUST be equal on either side. By counting atoms, you can see if the equation supports this law. If the numbers are equal, we say the equation is balanced.

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