Title: N2K 11/18/14
1N2K 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
2Constructed 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.
3SPI 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
4SPI 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
5SPI 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
6SPI 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)
7SPI 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)
8SPI 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
9SPI 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
10SPI 0807.9.5 Atmospheric Composition
Notes
Science
- Where did Earth's atmosphere come from?
- oxygen from plants
- (plants absorb carbon dioxide release oxygen)
11SPI 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.
12SPI 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
13SPI 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
14SPI 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.
15SPI 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.
16Exit 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