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Page 1: W Z } } Ç v Z ] · 2014. 10. 17. · W Z } } Ç v Z ] dD W } µ í X µ Z u } ( Z Á o v v v P o v P v o Ç µ Z ] X. Created Date: 10/17/2012 2:20:03 PM

Photosynthesis TM

Procedure1. Cut the stem of the water plant at an angle and gently crush it.2. Place the prepared water plant in the beaker3. Place the funnel over the water plant and fill the beaker with water. (You can add sodium bicarbonate to the water to increase the available CO2).4. Fill the test tube with water. Place a finger over the test tube and invert 4. Fill the test tube with water. Place a finger over the test tube and invert the test tube so it posioned over the end of the funnel. Put a mark on the test tube to the record the starng air level.5. Place the jar in sunlight. Check for evidence of bubbles. If no bubbles are present aer 5 minutes you may need to recut the stem on the water plant.

6. Once bubbles are flowing leave the appartus under light for 24 hours. Record level of gas in the test tube by making another mark on the test tube.7. Setup an idencal appartus and leave it in the dark for 24 hours. Record the level of gas in the tube and compare to the plant in the sunlight.If you would like to prove the gas is oxygen. Take the test tube and insert a glowing splint. We recommend this teacher is done only by the teacher as a demonstraon. The splint bursng into flame is an indicaon of the presence of oxygen.

Materials • Beaker • Short Stemmed Funnel • Test Tube • Water Plant (e.g Elodea or Spirogyra) • • Sodium Bicarbonate (NaHCO3) oponal • Glowing Splint oponal • Blocks (keep funnel off the boom of the beaker) • Light Source

Goal- Prove photosynthesis has occurred and that oxygen is a product of photosynthesis.

The Experiment

Photosynthesis is a process plants use to make food using the sun’s energy. Plants capture the sun’s energy using a chemical called chlorophyll. This provides the energy need to comvine water and carbon dioxide into sugar. Oxygen is also creatd through photosynthesis and released through a plants stomata.

light energy(chlorphyll)

6CO2 + 6H2O C6H12O6 + 6O2

The Science

The first sceinfic evidence for photosynthesis was found in the late 18th Century by chemists Joseph Priestley and Jan Ingenhousz. They noced that a plant could revive a mouse from suffocaon in an enclosed jar, using sunlight.

Did you know?All around us plants take in carbon dioxide and release oxygen into the atmosphere. Plants do this through a process called photosynthesis. Photosynthesis converts light energy from the Sun, into chemical energy that can be later released to fuel the plant. In the process oxygen is also released. Here is an experiment where we can prove that oxygen is indeed being released by plants during photosynthesis.

The Background

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