Download
1 / 5
60 likes | 205 Vues
Water is vital for life, thanks to its unique properties that regulate temperature and support biological processes. It heats up and cools down slowly, providing stability for organisms. Through capillary action, water reaches the tops of trees, while its adhesion and cohesion properties facilitate numerous ecological functions. Mixtures can be homogeneous or heterogeneous, affecting visibility and stability. Understanding pH levels is crucial, with acids and bases impacting biological reactions. Buffers are essential for maintaining pH balance in the body, preventing harmful fluctuations.
E N D
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
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
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
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.
