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

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.

History of Oxygen Oxygen was discovered independently by the Swedish chemist Carl Scheele and English chemist Joseph Priestley in the period 1773-1774 Given name by French chemist Antoine Laurent Lavoisier in 1779

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

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.

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 -218.4°C Boiling point is -183°C

Common Uses of Oxygen Oxidizer Rocket propulsion Medicine Oxygen sensors Welding

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%

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.

Photosynthesis 6H2O + 6CO2 ----------> 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.

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

Pictures of Photosynthesis

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.

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.

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

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.

Respiration Picture

Workcited http://periodic.lanl.gov/elements/8.html http://www.lenntech.com/periodic-chart-elements/o-en.htm http://science.jrank.org/pages/4970/Oxygen.html http://www.lenntech.com/elements-and-water/oxygen-and-water.htm http://www.facts-about.org.uk/science-element-oxygen.htm http://www.emc.maricopa.edu/faculty/farabee/BIOBK/BioBookPS