Transcript Energizing Cells

Energizing Cells
Carolina Kit
#25-1004
$159.95
Why?
Materials
Included
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Order form for Elodea
Bromothymol Blue solution
Plastic rulers
Circular fluorescent light
bulbs
Sucrose
Dry yeast
1mL dropping pipettes
Forceps
Mini-scoops
Not included
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Distilled water
Carbonated water
Beakers
Markers
Test tubes & racks
Aluminum foil
Light fixtures
50oC Hot Water Bath
Learning Cycle
 Engage - students think about cell
respiration while observing yeast in warm
sugar water.
 Explore – students set up experiment with
Elodea in Bromothymol Blue under light &
dark conditions to determine if CO2 is
produced or consumed
 Explain – students are asked to hypothesize
the outcome based on knowledge of
photosynthesis and cell respiration
 Extend – Answer questions/design
experiment to demonstrate their
Pre-Lab
 Bromothymol Blue as color indicator
 pH indicator in narrow range near neutral
(7.2)
 Base –>blue
 Acid –> yellow
 Neutral -> blue-green
 CO2 + H2O -- Carbonic Acid (a weak acid)
 Demo color change using weak NaOH
solution and carbonated water
For Today
 Divide into four
groups
 Follow instructions
on page S-2 of
handout
 Each group need
 Four 7cm Elodea
sprigs
 Four test tubes & rack
 DI H2O & 250mL
beaker
 Sparkling H2O & 50
ml beaker
 1 dropper
 Aluminum foil
 Bromothymol blue
Tomorrow
 Check results
 Do Extend Activity on p. S6