Transcript What is Oxygen?

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-chartelements/o-en.htm
• http://science.jrank.org/pages/4970/Oxygen.html
• http://www.lenntech.com/elements-andwater/oxygen-and-water.htm
• http://www.facts-about.org.uk/science-elementoxygen.htm
• http://www.emc.maricopa.edu/faculty/farabee/BI
OBK/BioBookPS