1. The Oxygen Cycle
By Christi Choi, Matt Brenner, Paul Lee, and Rachel Baughman

2. What is Oxygen?
The element Oxygen comes from the Greek words that mean ‘acid former’
Air is about 21% Oxygen.
Oxygen is colorless, odorless, and tasteless.
The element is blue in its liquid and solid forms.

3. History of Oxygen
Oxygen was discovered independently by the Swedish chemist Carl Scheele and English chemist Joseph Priestley in the period
Given name by French chemist Antoine Laurent Lavoisier in 1779

4. Meaning of Oxygen Originates from Greek words
Gennan meaning ‘generate’
Oxus meaning ‘acid’
It was believed that all acids contained oxygen

5. Structural Forms of Oxygen
Ordinary Oxygen: Contains two atoms per molecule, formula O2.
Ozone: Contains three atoms per molecule, formula O3.
Nonmagnetic: Is pale blue and contains four atoms per molecule, formula O4.

6. Properties of Oxygen Non-metallic element
Colorless, odorless, tasteless as a gas
Liquid/solid forms are pale blue
Poor conductor of heat and electricity
Melting point is °C
Boiling point is -183°C

7. Common Uses of Oxygen Oxidizer Rocket propulsion Medicine
Oxygen sensors
Welding

8. How Much Oxygen is There?
most abundant element on earth
Oxygen makes up fifth of the atmosphere
Oxygen makes up 46.6% of the earth’s crust
oxygen content of seawater is 85.7%

9. Oxygen In Water
Oxygen in water is known as a dissolved oxygen or DO.
In nature, oxygen enters water when water runs over rocks and creates surface area.
Microorganisms in bodies of water begin to metabolize organic matter, consuming oxygen in the process.

10. Photosynthesis
6H2O + 6CO > C6H12O6+ 6O2
Photosynthesis is the process by which plants, some bacteria, and some protistans use the energy from sunlight to produce glucose which cellular respiration converts into ATP, the energy used by all living things.

11. Photosynthesis Cont…
The conversion of unusable sunlight energy into usable chemical energy, is associated with the actions of the green pigment chlorophyll.

12. Pictures of Photosynthesis

13. Why do animals need oxygen?
Animals need oxygen to survive. In fact, all organisms need oxygen to complete the process to burning glucose for fuel. Burning glucose is an essential source for energy in our bodies. The body can use glucose, fat, or carbohydrates, but glucose gives the most energy.

14. Respiration
Cellular respiration is the set of the metabolic reactions and processes that take place in organisms' cells to convert biochemical energy from nutrients into ATP, and then release waste products.

15. Respiration Continued
The oxygen is used to break down certain organic compounds, which yield H2O and CO2, which are returned to the environment

16. Plant Respiration Plant cells also go through respiration
The plant cells use oxygen to breakdown glucose to release energy, with the byproduct being CO2
Without oxygen the plant cells would suffocate and die.

17. Respiration Picture

18. Workcited http://periodic.lanl.gov/elements/8.html