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Chemical polarity

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

chemical bonding review

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Name: ________________________ Class: ___________________ Date: __________ ID: A 1 CH 6 Review Multiple Choice Identify the choice that best completes the statement or answers the question. ____ 1. The electrostatic attraction between positively charged nuclei and negatively charged electrons permits two atoms to be held together by a(n) a. chemical bond. c. neutron. b. London force. d. ion. ____ 2. As atoms bond with each other, they a. increase their potential energy, thus creating less-stable arrangements of matter. b. decrease their potential energy, thus creating less-stable arrangements of matter. c. increase their potential energy, thus creating more-stable arrangements of matter. d. decrease their potential energy, thus creating more-stable arrangements of matter.

AP Bio Chapter 3 notes

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Chapter 3 ? Water & Fitness of the Environment Effect of Water?s Polarity Polarity of water causes hydrogen bonding Water is made up of 2 hydrogen and 1 oxygen; held together by 1 covalent bond Oxygen is slightly negative and hydrogen is slightly positive ?> polarity Polarity causes hydrogen to be attracted to other oxygen molecules, creating hydrogen bonds; each molecule can be connected to 4 other molecules 4 properties of water Water?s cohesion Stabilization of temperature Expansion upon freezing Versatility as a solvent Cohesion of water molecules Hydrogen bonds keep water molecules sticking together - hydrogen bonds are very weak; they form and reform with great frequency Cohesion: the process in which hydrogen bonds hold the substances together

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