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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 ... – PowerPoint PPT presentation

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Title: N2K 11/18/14


1
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

2
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.

3
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
4
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
5
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
6
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)
7
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)

8
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
9
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

10
SPI 0807.9.5 Atmospheric Composition
Notes
Science
  • Where did Earth's atmosphere come from?
  • oxygen from plants
  • (plants absorb carbon dioxide release oxygen)

11
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.
12
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
13
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
14
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.
15
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.
16
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
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