Potato Photosynthesis: Molecular Models and Chemical Changes
Plants
Unit
Activity 4.3 Molecular Models
for Potato Photosynthesis
1
You
are
here
Connecting Questions about Processes
at Different Scales
3
How does a potato plant make the
food it needs to grow and function?
4
Food
To Cells
Materials
for growth:
Biosynthesis
Energy:
Cellular
respiration
Chemical
change
Connecting the Atomic-Molecular Scale
to the Macroscopic Scale
5
How atoms bond together in molecules
•
Atoms in stable molecules always have a certain
number of bonds to other atoms:
–
Carbon: 4 bonds
–
Oxygen: 2 bonds
–
Hydrogen: 1 bond
•
Oxygen atoms do NOT bond to other oxygen
atoms if they can bond to carbon or hydrogen
instead.
•
Chemical energy
is stored in bonds between
atoms
–
Some bonds (C-C and C-H) have
high
chemical energy
–
Other bonds (C-O and O-H) have
low
chemical energy
6
Making the reactant molecules:
carbon dioxide and water
Complete
Step 1
in
Part B of your
worksheet.
7
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Reactants
Products
Water
Carbon dioxide
Important:
When you are
finished constructing
the reactants, put all
extra pieces away.
9
Record your results
Record your results
for your
reactants
.
10
Rearranging the Atoms to Make Product
Molecules: Glucose and Oxygen
Complete
Step 2
in
Part B of your
worksheet.
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Reactants
Products
Glucose
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Chemical
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13
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Reactants
Products
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Chemical
change
Water
Carbon dioxide
Record your results
Record your results
for your
products
.
14
Chemical change
Reactants
Glucose
Oxygen
Products
Water
Light energy
Carbon Dioxide
15
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Chemical change
Reactants
Glucose
Oxygen
Products
Water
Light energy
Carbon Dioxide
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Carbon atoms in
carbon dioxide
become part of
glucose molecules.
16
17
Chemical change
Reactants
Glucose
Oxygen
Products
Water
Light energy
Carbon Dioxide
Oxygen and hydrogen
atoms become part of
glucose and oxygen gas
molecules
.
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18
Chemical change
Reactants
Glucose
Oxygen
Products
Water
Light energy
Carbon Dioxide
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Light energy is
transformed into
chemical energy.
19
Chemical change
Reactants
Glucose
Oxygen
Products
Water
Light energy
Carbon Dioxide
Atoms last forever!
Energy lasts
forever!
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Discuss with the class
1.
Did the number and type of atoms stay the
same at the beginning and end of the
chemical change? ____
2.
Did the number of twist ties (representing
energy) stay the same at the beginning and
end of the chemical change? ____
3.
Why do the numbers of atoms and twist ties
have to stay the same?
20
Writing a Chemical Equation
•
Chemists use
chemical equations
to show how atoms of
reactant molecules are rearranged to make product
molecules
•
Writing the equation in symbols: Chemists use an arrow to
show how reactants change into products:
[reactant molecule formulas]
product molecule formulas]
•
Saying it in words: Chemists read the arrow as “yield” or
“yields:”
[reactant molecule names] yield [product molecule names]
•
Equations must be
balanced:
Atoms last forever, so
reactant and product molecules must have the same
number of each kind of atom
•
Try it: can you write a balanced chemical equation to show
the chemical change when animals move (use energy)?
21
22
Chemical equation for
photosynthesis
6 CO
2
+ 6 H
2
O
C
6
H
12
O
6
+ 6O
2
(in words: carbon dioxide reacts with
water to yield glucose and oxygen)
Exit Ticket
•
Conclusions
–
Where do you think the reactants for
photosynthesis come from?
•
Predictions
–
Where do you think photosynthesis occurs?
23
Image Credit: Craig Douglas, Michigan State University
Explore the process of photosynthesis in potato plants through molecular models and chemical changes at different scales, from atomic-molecular to macroscopic. Learn how potato plants produce food through biosynthesis and cellular respiration, connecting the atomic-molecular scale to the macroscopic scale. Understand how atoms bond together in molecules and the role of chemical energy in these bonds. Through creating reactant molecules like carbon dioxide and water, delve into the intricate process of converting energy units of light into products.
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Presentation Transcript
Carbon: Transformations in Matter and Energy Environmental Literacy Project Michigan State University Plants Unit Activity 4.3 Molecular Models for Potato Photosynthesis 1
You are here
Connecting Questions about Processes at Different Scales Scale Unanswered Questions How does a potato plant make the food it needs to grow and function? Macroscopic Scale How do potato s leaf cells produce the food the potato needs to grow and function? Microscopic Scale What chemical change produces food in the potato s leaf cells? Atomic-Molecular Scale 3
How does a potato plant make the food it needs to grow and function? Materials for growth: Biosynthesis Food To Cells Energy: Cellular respiration 4
Connecting the Atomic-Molecular Scale to the Macroscopic Scale Chemical change 5
How atoms bond together in molecules Atoms in stable molecules always have a certain number of bonds to other atoms: Carbon: 4 bonds Oxygen: 2 bonds Hydrogen: 1 bond Oxygen atoms do NOT bond to other oxygen atoms if they can bond to carbon or hydrogen instead. Chemical energy is stored in bonds between atoms Some bonds (C-C and C-H) have high chemical energy Other bonds (C-O and O-H) have low chemical energy 6
Making the reactant molecules: carbon dioxide and water Complete Step 1 in Part B of your worksheet. 7
Photo of reactant molecules: CO2 (carbon dioxide) and H2O (water) Start by making the molecules of the reactants and energy units of light. Put them on the reactants side, then rearrange the atoms and energy units to show the products. Chemical change Carbon dioxide Water Products Reactants Remember: Atoms last forever (so you can rearrange atoms into new molecules, but can t add or subtract atoms). Energy lasts forever (so you can change forms of energy, but energy units can t appear or go away). 8
Important: When you are finished constructing the reactants, put all extra pieces away. 9
Record your results Record your results for your reactants. 10
Rearranging the Atoms to Make Product Molecules: Glucose and Oxygen Complete Step 2 in Part B of your worksheet. 11
Photo of product molecules: H6C12O6 (glucose) and O2 (oxygen) Start by making the molecules and energy units of the reactants and putting them on the reactants side, then rearrange the atoms and energy units to show the products. . Glucose Chemical change Oxygen Products Reactants Remember: Atoms last forever (so you can rearrange atoms into new molecules, but can t add or subtract atoms). Energy lasts forever (so you can change forms of energy, but energy units can t appear or go away). 12
Comparing photos of reactant and product molecules Compare the atoms and energy units on the reactant and products sides. . Glucose Chemical change Carbon dioxide Water Oxygen Products Reactants Remember: Atoms last forever (so you can rearrange atoms into new molecules, but can t add or subtract atoms). Energy lasts forever (so you can change forms of energy, but energy units can t appear or go away). 13
Record your results Record your results for your products. 14
What happens to atoms and energy in photosynthesis? Carbon Dioxide Glucose Reactants Chemical change Water Products Oxygen Light energy 15
What happens to carbon atoms in photosynthesis? Carbon Dioxide Glucose Reactants Chemical change Water Products Carbon atoms in carbon dioxide become part of glucose molecules. Oxygen Light energy 16
What happens to oxygen and hydrogen atoms in photosynthesis? Carbon Dioxide Glucose Reactants Chemical change Water Products Oxygen and hydrogen atoms become part of glucose and oxygen gas molecules. Oxygen Light energy 17
What happens to light energy in photosynthesis? Carbon Dioxide Glucose Reactants Chemical change Water Products Light energy is transformed into chemical energy. Oxygen Light energy 18
What happens to atoms and energy in photosynthesis? Carbon Dioxide Glucose Reactants Chemical change Water Products Atoms last forever! Energy lasts forever! Oxygen Light energy 19
Discuss with the class 1. Did the number and type of atoms stay the same at the beginning and end of the chemical change? ____ 2. Did the number of twist ties (representing energy) stay the same at the beginning and end of the chemical change? ____ 3. Why do the numbers of atoms and twist ties have to stay the same? 20
Writing a Chemical Equation Chemists use chemical equations to show how atoms of reactant molecules are rearranged to make product molecules Writing the equation in symbols: Chemists use an arrow to show how reactants change into products: [reactant molecule formulas] product molecule formulas] Saying it in words: Chemists read the arrow as yield or yields: [reactant molecule names] yield [product molecule names] Equations must be balanced: Atoms last forever, so reactant and product molecules must have the same number of each kind of atom Try it: can you write a balanced chemical equation to show the chemical change when animals move (use energy)? 21
Chemical equation for photosynthesis 6 CO2 + 6 H2O C6H12O6 + 6O2 (in words: carbon dioxide reacts with water to yield glucose and oxygen) 22
Exit Ticket Conclusions Where do you think the reactants for photosynthesis come from? Predictions Where do you think photosynthesis occurs? 23
