Notes from class and vocabulary

1. PhotosynthesisPhotosynthesis

2. Results of experiment
• Beans grown with water, carbon
dioxide, and light increased in mass
• Increased mass was food
• Food produced is called sugar
• Process is called Photosynthesis
– Happens in green cells

3. Equation
• 6CO2 + 12H2O → C6H12O6 +6O2 + 6H2O
• Six molecules Carbon Dioxide combine
with twelve molecules Water
• Form one molecule Sugar, six
molecules Oxygen, and six molecules
Water

4. • Only happens when energy from light present
– No light : no food production
• Photo - light, synthesis - put together from parts
• 6CO2 + 12H2O + Solar Energy → C6H12O6 +6O2 + 6H2O
• Energy from Sun changes into chemical energy in
sugar
• Energy powers cell
• Run, think, feel, see - using solar energy
• Sugar can change to starches, fats, proteins
• Our food breaks down to the same sugar

5. Activity
• Using the atom models
– Build 6 Carbon Dioxide (CO2) molecules
and 12 Water (H20) molecules
• With the energy from the Sun,
rearrange the molecules to form
– 1 Sugar (C6H12O6) molecule, 6 Oxygen (O2)
molecules and 6 Water (H2O) molecules
• Copy the formulas and draw the
models in your notebook

6. Vocabulary
• Food
– The source of energy and building materials for
living cells
• Photosynthesis
– A chemical process in which cells produce
energy-rich sugar molecules and release oxygen
• Fats and Proteins
– Groups of nutrients that provide energy and
building blocks for growth and development
• Starches
– Chemicals produced by plants to store food

7. Vocabulary
• Mass
– A quantity of matter
• Molecule
– A particle made of two or more atoms
– A sugar molecule is made of carbon, hydrogen,
and oxygen
• Sunlight
– Solar energy, light from the Sun

8. Content
• What is Photosynthesis?
• Photosynthesis is the process in which sugar
(food) is made from carbon dioxide, water, and
solar energy, and oxygen and water are
released.
• What is the chemical formula for
Photosynthesis?
• 6CO2 + 12H2O + Solar Energy C6H12O6 + 6H2O + 6O2

9. Questions from Reading
• What is sugar?
• What raw material do plants need to
build sugar molecules?
• Where do they come from?

10. Questions
• What is the role played by chlorophyll?
• What are the products of
photosynthesis?
• Where do plants produce food?

11. Questions
• You run on solar energy. How is that
possible?