Properties of water

Properties of Water ,[object Object],[object Object],[object Object],[object Object],[object Object]

Polarity of Water ,[object Object],[object Object],[object Object],[object Object]

HYDROGEN BONDS ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Organisms Depend on Cohesion ,[object Object],[object Object],[object Object],Hydrogen bonds hold the substance together, a phenomenon called cohesion

Moderates Temperatures on Earth ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object], Water stabilizes air temperatures by absorbing heat from warmer air and releasing heat to cooler air. Water can absorb or release relatively large amounts of heat with only a slight change in its own temperature. Celsius Scale at Sea Level 100 o C Water boils 37 o C Human body temperature 23 o C Room temperature 0 o C Water freezes

Specific Heat is the amount of heat that must be absorbed or lost for one gram of a substance to change its temperature by 1 o C . ,[object Object],[object Object],[object Object],[object Object]

Evaporative Cooling ,[object Object],[object Object],[object Object],[object Object],[object Object]

Density of Water ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Solvent for Life ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Most biochemical reactions involve solutes dissolved in water. ,[object Object],[object Object],[object Object]

Concentration of a Solution ,[object Object],[object Object],[object Object],[object Object]

Molarity ,[object Object],[object Object],Calculate a one molar solution of sucrose, C 12 H 22 O 16 . C = 12 daltons H = 1 dalton O = 16 daltons 12 x12 = 144 1 x 22 = 22 16 x 11 = 176 342 For a 2M solution? For a .05 M solution? For a .2 M solution?

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Acids and Bases ,[object Object],[object Object],[object Object],[object Object],[object Object]

pH Scale ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Problem How much greater is the [ H + ] in a solution with pH 2 than in a solution with pH 6? Answer: pH of 2 = [ H + ] of 1.0 x 10 -2 = 1/100 M pH of 6 = [ H + ] of 1.0 x 10 -6 = 1/1,000,000 M 10,000 times greater

Buffers ,[object Object],[object Object],[object Object],[object Object]

Acid Precipitation ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Properties of water

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