SCIENCE WITH MR. HAUG - Mr. Haug's Page



Observing PhotosynthesisSpinach Disk LabWritten InstructionsGoal:Materials:Light Source at two different heights (15cm and 30cm)150ml BeakerSodium Bicarbonate WaterSyringeSpinach LeafHole PunchGogglesSafety:Be sure to wear your goggles during the labDo not allow the liquid to squirt out of the syringe, it can injure and cause damageInstructions:Add 100ml of sodium bicarbonate water to a 150ml beakerUse the hole punch to punch out 15 disks from a spinach leaf. (Avoid the larger veins of the leaf)Remove the plunger from the syringePlace the 15 disks into the syringe and replace the plunger (Do not crush the disks)Carefully use the plunger to draw in 10 ml of sodium bicarbonate water from your beaker into the syringeShake the syringe until all the disks are in the liquidHold the syringe with the tip pointing upCarefully push the plunger up until you have pushed all the air out of the syringePlace your thumb over the tip and slowly move the plunger in and out (This will remove any air from the leaves by alternating pressure and a vacuum to the disks)Repeat pushing and pulling until the disks sink in the liquidCarefully remove the plunger and allow the liquid and disks to pour back into your beakerYou want a minimum of 10 of the disks to sink to the bottom of the beaker, any extras that are still floating can be removedPlace your beaker under the 15cm light source and start timing (we will skip the step in the video where he added a heat sink)Record the time it takes for 6 of the spinach disks to rise to the surfaceRemove the disks from the liquid and throw the disks away. You can reuse the liquidRepeat the steps but place your beaker under the 30cm light source and record the time it takes for 6 of the spinach disks to rise to the surface.Name:Period:Observing PhotosynthesisSpinach Disk LabObservationsIn the space below, draw what the experiment looks like when the beaker is under the light source.Time for 6 Disks to Rise to Surface15cm Light SourceTime for 6 Disks to Rise to Surface30cm Light SourcePhotosynthesis Formula : 6CO2 + 6H2O ----(Light Energy)--- > C6H12O6 + 6O2Carbon Dioxide + Water ---(Light Energy)--- > Glucose and OxygenAnalysis and Conclusion:What gas was produced by the process of photosynthesis and caused the spinach disks to float?What was the difference in time you recorded between the two experiments?What caused the difference?How would the rate of photosynthesis for a plant change from morning to night on a summer day? ................
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