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Campbell Biology Chapter 3

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Chemistry
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Hydrogen

? 2017 Pearson Education, Inc. Lecture Presentations byNicole Tunbridge and Kathleen Fitzpatrick Chapter 3Water and Life The Molecule That Supports All of Life Water makes life possible on Earth Water is the only common substance to exist in the natural environment in all three physical states of matter Water?s unique emergent properties help make Earth suitable for life The structure of the water molecule allows it to interact with other molecules ? 2017 Pearson Education, Inc. Concept 3.1: Polar covalent bonds in water molecules result in hydrogen bonding In the water molecule, the electrons of the polar covalent bonds spend more time near the oxygen than the hydrogen The water molecule is thus a polar molecule:The overall charge is unevenly distributed

Campbell Biology 9th Edition - Ch. 3 Water

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Chemical polarity

Water is Special Polarity There are two types of covalent bonds, polar and nonpolar While nonpolar molecules share electrons equally, polar molecules do not. This results in one part of the molecule being partially positive and another part being partially negative. 2 Student Misconceptions and Concerns

Chapter 1.2 Outline

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Chemistry
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Gas
Liquid

Matter Classified by? Physical State (Gas/ Liquid/ Solid) Composition (Element/ Compound/ Mixture) States of Matter Gas (vapor) No fixed volume or shape Uniformly fills its container Can be compressed to occupy a smaller volume Can be expanded to occupy a larger volume Molecules are far apart, move quickly, and often collide with the surrounding container Liquid Distinct volume (independent of container) No fixed shape (assumes shape of occupied container) Can't be compressed Molecules are packed closely but can still move (they flow over each other, reducing viscosity Solid Definite shape and definite volume Can't be compressed Molecules have fixed positions an wiggle only slightly *Temperature and pressure changes lead to phase changes of the substance

AP Biology Campbell/Reece 8e Chapter 3 Notes

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AP Biology
Chapter 3 – Water and the Fitness of the Environment 3.1 – The polarity of water molecules results in hydrogen bonding • Polar molecule – two ends of the molecule have opposite charges • Oxygen: δ- • Hydrogen: δ+ • Positive hydrogen of one molecule is attracted to negative oxygen of another in a hydrogen bond 3.2 – Four emergent properties of water contribute to Earth’s fitness for life • Four properties: cohesive behavior, ability to moderate temperature, expansion upon freezing, versatility as a solvent • Cohesion – the bonding of similar molecules through hydrogen bonds • Adhesion – the clinging of one substance to another • Surface tension – a measure of how difficult it is to stretch or break the surface of a liquid • Kinetic energy – energy of motion
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