N2K 11/18/14

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N2K 11/18/14

• SPI 0807.9.1 (Atoms)Which of the following best
  describes an atom?
• a. protons and electrons grouped together in a
  random pattern
• b. protons and electrons grouped together in a
  alternating pattern
• c. a core of protons and neutrons surrounded by
  electrons
• d. a core of electrons and neutrons surrounded by
  protons

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Constructed Response 11/18/14

• U.S. scientists announced the launch of the
  worlds most accurate atomic clock. Its three
  times better than the United States former top
  clock. The new timepiece named NIST-F2 is so
  precise that it loses (or gains) no more than one
  second every 300 million years. That makes it
  about a million times more accurate than the
  first atomic clocks, built back in 1955.
• The new clock takes its name from where it was
  born at the National Institute of Standards and
  Technology, or NIST, in Boulder, Colorado.
  Actually, F2 really isnt a clock, says Thomas
  OBrian. He should know. He runs NISTs Time and
  Frequency Division, which developed F2. Its not
  a clock in the sense of something that keeps
  track of the time of day, he explains.
• Atomic clocks such as F2 determine the precise
  length of a second. Many everyday devices, from
  computers and GPS-satellite receivers to the
  system that transmits electric power across the
  country, rely on the high accuracy of atomic
  clocks to coordinate their activities. Some
  wristwatches even use atomic clocks to maintain
  perfect time. But the heart of the system is
  invisible to the eye a pool of cesium atoms
  sailing around inside a near-vacuum within that
  big tube. Cesium-based atomic clocks have been
  around since the mid-1950s. Cesium is a metallic
  chemical element with an atomic number of 55.
  Among its many uses, cesium serves as the basis
  of todays atomic clocks and is used in many
  photo-electric cells. Scientists have defined the
  length of one second in terms of cesium atoms
  since 1967. Thats when the General Conference on
  Weights and Measures, the international group
  that puts an official stamp on quantities like a
  kilogram or meter, changed the definition of a
  second. It announced that the second would no
  longer be defined in terms of the length a day,
  which is based on the rotation of the Earth.  
• Which chemical element is used in atomic clocks?
  Which category on the periodic table does it fit
  in? Explain why atomic clocks are unique.

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SPI 0807.9.5 Atmospheric Composition
Notes
Science
Tennessee SPI Objective Describe the chemical
makeup of the atmosphere.
Check for Understanding Explain how the chemical
makeup of the atmosphere illustrates a mixture of
gases.
Essential Question(s) What is the chemical
composition of our atmosphere, and how does this
illustrate a mixture of gases?
Atmosphere song
TOC Atmospheric Composition Notes
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SPI 0807.9.5 Atmospheric Composition
Notes
Science
What is an Atmosphere?

• An atmosphere is the mass of gases that
  surrounds a planet
• and is held in place by the gravity of the planet.

• Planetary atmospheres are common in our solar
  system
• (Even the Moon has a thin atmosphere)

Saturn
Mars
Jupiter
Earth
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SPI 0807.9.5 Atmospheric Composition
Notes
Science
Earth's Atmosphere
Earths atmosphere is a mixture of various gases
Earth's Current Atmosphere (approx) 78
nitrogen (approx) 21 oxygen (approx) 1 other
gases (argon, water vapor, carbon dioxide,
ozone, etc)
Remember! Our atmosphere is a MIXTURE not a
compound
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SPI 0807.9.5 Atmospheric Composition
Notes
Science
Earth's Current Atmosphere (approx) 78
nitrogen (approx) 21 oxygen (approx) 1 other
gases (argon, water vapor, carbon dioxide,
ozone, etc)
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SPI 0807.9.5 Atmospheric Composition
Notes
Science

• Where did Earth's atmosphere come from?
• from comets and planetismals
• Venting from volcanoes
• oxygen from plants
• (View Holt Online Ch15 Sect 3 VC)

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SPI 0807.9.5 Atmospheric Composition
Notes
Science

• Where did Earth's atmosphere come from?
• from comets and planetismals (water from space)

What are comets? Comets are giant "dirty
snowballs" in space. They consist of frozen
water, stellar dust, and rocky debris.p406
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SPI 0807.9.5 Atmospheric Composition
Notes
Science

• Where did Earth's atmosphere come from?
• Venting from volcanoes
• 3 most common gases from volcanoes
• (1) Water Vapor, (2) Carbon Dioxide, and (3)
  Sulfur Dioxide

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SPI 0807.9.5 Atmospheric Composition
Notes
Science

• Where did Earth's atmosphere come from?
• oxygen from plants
• (plants absorb carbon dioxide release oxygen)

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SPI 0807.9.5 Atmospheric Composition
Notes
Science
Yes it has!
Has Earth's atmosphere ever changed?
Earths first atmosphere was mostly carbon
dioxide, water vapor, ammonia
What changed it?
Plants converted the carbon dioxide to oxygen ,
and this oxygen broke down the ammonia into
nitrogen.
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SPI 0807.9.5 Atmospheric Composition
Review
Science
Oxygen
For the Earths atmosphere, section number two in
the pie Graph above BEST represents the
percentage of? A) Carbon B) Oxygen C)
Argon D) Nitrogen
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SPI 0807.9.5 Atmospheric Composition
Review
Science

• In diagram 01 below, which gas is represented in
  the portion
• labeled 1 on the pie chart?
• Argon B) Nitrogen C) Hydrogen D)
  Oxygen

Nitrogen
Diagram 01
Diagram 02
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SPI 0807.9.5 Atmospheric Composition
Science
Questions
Atmospheric Composition-Question
Here is an example of a question you might see on
a quiz or test.
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SPI 0807.9.5 Atmospheric Composition
Science
Questions
Atmospheric Composition-Question
Here is an example of a question you might see on
a quiz or test.
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Exit Ticket
The table shows the percentage of individuals in
a population of insects that is resistant to
certain types of insecticides.
Which two populations would be most affected by a
widespread use of Insecticide 2?
A. 2 and 4 B. 1 and 6 C. 3 and 5 D. 4 and 6