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Water and Solutions

Water and Solutions. Water. Its properties enable life to exist! Heats up slowly and cools slowly Prevents organisms from changing temperature rapidly Allows a lot of heat to be taken away from the body during sweating Moderates temperatures under water and near large lakes and oceans

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Water and Solutions

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  1. Water and Solutions

  2. Water • Its properties enable life to exist! • Heats up slowly and cools slowly • Prevents organisms from changing temperature rapidly • Allows a lot of heat to be taken away from the body during sweating • Moderates temperatures under water and near large lakes and oceans • Capillary Action – allows water to reach the tops of trees • Adhesion – water sticks to a polar surface • Cohesion – water molecules stick to each other

  3. Mixtures • Homogeneous – same throughout • Solutions – particles are evenly distributed in the solvent • No Tyndall Effect • Heterogeneous – different throughout • Colloid – particles do not settle out – Shows the Tyndall effect • Suspensions – particles are a little larger, and will settle out

  4. Bases pH above 7 Higher concentration of OH- (hydroxide ions) The further away from 7 the more basic Also called alkaline Bitter pH – A measure of the hydrogen ion concentration Acids • pH below 7 • Higher concentration of H3O+ (hydronium ions) • The further away from 7 the more acidic • Sour * Changing the pH by 1 means that the concentration of H+ has increased or decreased by 10x

  5. Buffer • Reduces changes in pH • Important in the body, because changes in pH can affect how reactions happen • CO2 mixes with H2O to make carbonic acid (in a process similar ti the one that forms acid rain). Without a buffer your blood would become acidic.

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