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electron

Campbell Reece 8th Edition Test bank chapter 2

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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

Campbell Biology 9th All multiple choice Chp 2.

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Campbell's Biology, 9e (Reece et al.) Chapter 2 The Chemical Context of Life This chapter presents basic chemical principles for understanding the chemical context of living organisms, from atomic structure to the nature of chemical bonds and an introduction to chemical equilibrium. These questions focus on elements most important to life or the study of life, including the elements that comprise organic molecules and important trace elements. Some isotopes are important in geologic dating and in biological tracer studies. How elements participate in forming different types of chemical bonds is essential to mastering subsequent topics on the behavior and properties of biological molecules, structures, and energy metabolism. Multiple-Choice Questions

chemistry midterm review

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Name: ________________________ Class: ___________________ Date: __________ ID: A 1 MIDTERM REVIEW Multiple Choice Identify the choice that best completes the statement or answers the question. ____ 1. Inorganic chemistry is the study of a. non-carbon related compounds. b. the chemistry of living things. c. mathematical modeling. d. the identification of the composition of materials. ____ 2. A student recorded the following while completing an experiment. Color of substance: yellow, shiny powder Effect of magnet: yellow, shiny powder was attracted The student should classify the substance as a(n) a. element. c. mixture. b. compound. d. plasma. ____ 3. Which of the following is not a physical change? a. grinding c. boiling b. cutting d. burning

Campbell Biology Chapter 2 outline

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#AP Bio #CampbellBiology #Chapter 2 #Outline

SUBATOMIC PARTICLES Proton ? 1 positive charge (P+) Neutron ? no charge (N0) Electron ? 1 negative charge (E+) Nucleus An atom's dense central core, containing protons and neutrons. Electrons move around the nucleus Matter Anything that has mass and takes up space Elements Substance that cannot be broken down by a chemical reaction 92 occur naturally 25 of which are essential for life Bulk elements Required by the body in large amounts C N H O (make up 96% of the body) Trace elements Required by the body in small amounts Ultra trace elements Required by the body in minute amounts Atoms Smallest unit of matter that still retains properties of an element Weight Add proton and neutrons together for weight of nucleus Every proton and neutron weights one Dalton

Electron filling diagram

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1s2s2p
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1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f ? 6s 6p 6d ? 7s 7p ? 8s ? The order of increasing energy of the sublevels: 1s 2s 2p 3s 3p 4s 3d 4p 5s 4d 5p 6s 4f 5d 6p 7s 5f 6d ? This order corresponds to the order in which the energy sublevels are filled by electrons. nucleus 1s 2s 2p 3s 3p 4s 3d 4p 4d 4f n = 1 n = 2 n = 3 n = 4 Energy level (n) Energy sublevel Increasing Energy
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