Lesson 12 Vocabulary
Oxidation: when a substance combines with oxygen. There are 2
forms: Combustion and Cellular Respiration.
Cellular Respiration: this takes time to occur, it occurs when
glucose(nutrients) and oxygen combine, the 3 products are
energy, carbon dioxide and water
Glucose + Oxygen —> energy + carbon dioxide + water
Oxygen from the air is combined with nutrients in the body cells
to release energy for the cells, while carbon dioxide and water
are given off as waste products.
Combustion: a rapid release of energy, the products of this are
heat and light
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Inquiry 12 Getting Started activity notes:
focuses on combustion (one form of oxidation)
When you light a candle, you see smoke. As you swirl the
bromthymol blue in the beaker, the color changes to
greenish-yellow. This is an indication that carbon dioxide
was released during oxidation and that it was dissolved in
the solution. This dissolved carbon dioxide forms carbonic
acid, and the newly acidic environment initiates the color
change. It is a weak acid.
The ingredients of combustion (for this activity) are wick,
wax, and oxygen.
The products of combustion (for this activity) are heat and
light energy.
bromthymel blue is a PH indicator
Inquiry 12.1
- focuses on cellular respiration, a second form of oxidation.
- In this inquiry, the temperature of the water rises about
3°C. This shows that energy, in the form of heat, is
released during exhalation. (this release of heat is only a
small portion of the heat released during cellular
respiration)
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Inquiry 12.2
Use an apparatus to look for evidence that carbon dioxide is
present in exhaled air but not in inhaled air.
In reality, inhaled air contains .03% carbon dioxide and 20%
oxygen, exhaled air contains about 4% carbon dioxide and
16% oxygen.
The bromthymel blue solution changed color greenishyellow) due to the carbon dioxide in the exhaled air through
the exhaled tube.
2 products of cellular respiration are heat and carbon
dioxide.
Inquiry 12.3
This inquiry determines whether carbon dioxide can pass
through a membrane.
The carbon dioxide in the carbonated water diffuses rapidly
through the membrane into the bromthymel blue solution
(turned yellow in color).
In the body, oxygen and carbon dioxide are exchanged as
blood circulates through the lung tissue. It is important
that gases be able to cross membranes easily between the
alveoli, bloodstream and body cells.
Carbon dioxide and oxygen pass through the membrane by
diffusion.
Combustion
-Occurs rapidly
Both
-Oxygen is
necessary
-Energy is
released
-Often started by outside source
-Wastes are
(match or lighter)
produced
(often carbon
-Often uncontrollable
dioxide & water)
-A lot of heat & light
-Many different fuels possible
Cellular Respiration
-Occurs slowly, in small
steps
-Controlled by enzymes
-No flame
-Much energy is stored
-Glucose is often the first
choice for fuel