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Lecture #1 ~ Date__________

Lecture #1 ~ Date__________. Chapter 3: Water and the Fitness of the Environment. Water. Pola r~ opposite ends, opposite charges Cohesion ~ H+ bonds holding molecules together Adhesion ~ H+ bonds holding molecules to another substance

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Lecture #1 ~ Date__________

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  1. Lecture #1 ~ Date__________ • Chapter 3: Water and the Fitness of the Environment

  2. Water • Polar~ opposite ends, opposite charges • Cohesion~ H+ bonds holding molecules together • Adhesion~ H+ bonds holding molecules to another substance • Surface tension~ measurement of the difficulty to break or stretch the surface of a liquid • Specific heat~ amount of heat absorbed or lost to change temperature by 1oC • Heat of vaporization~ quantity of heat required to convert 1g from liquid to gas states • Density……….

  3. Density • Less dense as solid than liquid • Due to hydrogen bonding • Crystalline lattice keeps molecules at a distance

  4. Acid/Base & pH • Dissociation of water into a hydrogen ion and a hydroxide ion • Acid: increases the hydrogen concentration of a solution • Base: reduces the hydrogen ion concentration of a solution • pH: “power of hydrogen” • Buffers: substances that minimize H+ and OH- concentrations (accepts or donates H+ ions)

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