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Charge carriers

Campbell Reece 8th Edition Test bank chapter 2

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Chemistry
Chemical bonding
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Chapter 2 The Chemical Context of Life 1) About 25 of the 92 natural elements are known to be essential to life. Which four of these 25 elements make up approximately 96% of living matter?? A) carbon, sodium, chlorine, nitrogen? B) carbon, sulfur, phosphorus, hydrogen? C) oxygen, hydrogen, calcium, sodium? D) carbon, hydrogen, nitrogen, oxygen? E) carbon, oxygen, sulfur, calcium? Answer: ?D? Topic: ?Concept 2.1? Skill: ?Knowledge/Comprehension 2) Trace elements are those required by an organism in only minute quantities. Which of the following is a trace element that is required by humans and other vertebrates?? A) nitrogen? B) calcium? C) iodine? D) sodium? E) phosphorus? Answer: ?C? Topic: ?Concept 2.1? Skill: ?Knowledge/Comprehension

Prentice Hall AP Chem. Chapter 2 notes

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Chemistry
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Chemistry
Science
Physics
John Dalton
Atomic theory
Matter
Molecule
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ion
Polyatomic ion
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atoms
molecules
ions

Chapter 2 Atoms, Molecules, and Ions John D. Bookstaver St. Charles Community College St. Peters, MO ? 2006, Prentice Hall, Inc. Chemistry, The Central Science, 10th edition Theodore L. Brown; H. Eugene LeMay, Jr.; and Bruce E. Bursten Atomic Theory of Matter The theory that atoms are the fundamental building blocks of matter reemerged in the early 19th century, championed by John Dalton. Dalton?s Postulates Each element is composed of extremely small particles called atoms. Dalton?s Postulates All atoms of a given element are identical to one another in mass and other properties, but the atoms of one element are different from the atoms of all other elements. Dalton?s Postulates

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Art History
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Ozone depletion
Environment
Oxygen
Earth
Chemistry
Atmosphere
Disinfectants
Environmental chemistry
Ozone
Ultraviolet
Stratosphere
Ozone layer
Health
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Physics
Chemistry
Nuclear physics
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Baryons
Charge carriers
Atomic number
Proton
Ozone depletion
Ozone
Chemical element
Atomic mass
Technology
Gone With the Wind

Michael Treacy 3/3/2010 Pd. 3 Ozone Hole @ TD 1. What is the Ozone and why do we need it in our atmosphere to have a healthier planet? The Ozone is the Gas O3. This gas is located in the Stratosphere and absorbs UV Rays. We need the ozone in our atmosphere because it absorbs 98% of the UV Rays. Without the ozone to filter all these UV Rays many animals would have medical / health problems. 2. Describe how the ozone protects us. The ozone protects us by filtering out and absorbing most of the UV Rays before they reach the earth. Most of the Rays are biologically harmful and know to damage tissues and cells. 3. How is a chlorine atom harmful to the ozone in the stratosphere?

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