Flow of Matter Carbon Cycle TEKS 12 ae (9abcd)

Objectives 1. Be able to analyze the flow of energy through the Carbon cycle. 2. Be able to analyze changes caused by human and natural occurrences.

What is Carbon Carbon is a chemical element. Look at the periodic table at the front of the room. 1. What group is carbon in? ________ 2. What is the atomic mass? ________ 3. How many protons? __________ ….but why is carbon so important?

What is Carbon From proteins to sugars, carbon is the building block of the molecules of life. Linked carbon atoms form the frame for molecules produced by plants and other living things. Organisms use these carbon molecules for growth and energy.

For example, atoms of carbon can be found in the framework for proteins, carbohydrates, fats and more… PROTEIN – myoglobin 3d Figure

What is carbon Carbon is found in many forms, a few examples are: graphite, diamond and coal GRAPHITE DIAMONDS

What is Carbon Notice how the graphite was black and the diamond was clear. Different forms of carbon have different Characteristics. Graphite, Diamonds and Coal are all allotropes, which means that they are all the same element, but have formed different types of bonds.

What is Carbon In fact, carbon has an even more important role on earth that graphite, diamonds and coal. Does anyone know what it is? Carbon is the basis for all living things. All living things are said to be organic and contribute to the biotic factors.

Carbon Cycle Let’s examine the carbon cycle starting with autotrophs. During photosynthesis autotrophs take energy from the sun and convert carbon dioxide gas into energy rich carbon molecules. These carbon molecules are used for food and energy.

Carbon Cycle…a closer look… This chemical equation represents photosynthesis. 6H 2 O + 6CO > C 6 H 12 O 6 + 6O 2 Water + Carbon Dioxide --turns into-  Sugar + Oxygen Sunlight Looking at the formula above, explain how the carbon cycle relates to living organisms….and how to living organisms turn sugar back into CO 2 and H 2 O

Carbon Cycle Does anyone have an example of an autotroph that does photosynthesis? When the autotrophs and heterotrophs use the carbon-containing molecules and release energy, carbon dioxide is released and returned to the atmosphere. This process is the opposite of photosynthesis and is called Respiration.

Carbon Cycle Section 2.2 Summary – pages The carbon cycle Atmospheric CO 2 Dissolved CO 2 Open burning Photosynthesis Respiration Fuel Combustion Photosynthesis Respiration Death and decay Fossil fuels

Humans and Carbon How have humans influenced the carbon cycle? With a partner come up with ways that humans influence the carbon cycle. Be ready to share your ideas with the class.

Humans and Carbon Scientists have been measuring the atmospheric CO 2 over the past 50 years… What do you think they discovered about the amount of CO 2 in the atmosphere???

Humans and Carbon It has sky rocketed!

Human and Carbon But why? Let’s brainstorm ways That CO 2 can get Into the atmosphere

Carbon and Humans Burning of fossil fuels is a major contributor to the increase in the atmospheric levels of CO 2

Carbon and Humans Another contributor is the clearing of trees and plants. Why would this make levels of CO 2 higher? (think about what the plants do….)

This graph shows the change in atmospheric carbon dioxide since 1960 This graph shows the change in atmospheric carbon dioxide since 1960 What is the result of this change now and for our future? What is the result of this change now and for our future? Visionlearning, Inc.Visionlearning, Inc. & National Science Found.

Carbon and Humans Because CO 2 increases the atmosphere’s ability to hold heat, it has been called a “greenhouse gas.” Because CO 2 increases the atmosphere’s ability to hold heat, it has been called a “greenhouse gas.”

Review Remember, these were your goals… 1. Be able to analyze the flow of energy through the Carbon cycle. 2. Be able to analyze changes caused by human and natural occurrences.

Review List 3 processes that move carbon through the environment. 1. _ __________________ 2. _ __________________ 3. _ __________________ Photosynthesis, Respiration, Fuel Combustion, Open Burning, Forest Burning, Death/Decay

Review Which of the following would decrease the amount of carbon dioxide in the air? A. A growing maple tree B. A running Dog C. A person driving a car D. A burning forest

Review Explain the relationship between Photosynthesis and Respiration. Now you will do an experiment with Carbon...