Thursday, September 7th WATER and its emergent properties. Lab Quiz (Timed- 35 minutes to complete) THIS GRADE WILL NOT BE A “DROP” OPTION You need a calculator Turn in YOUR Lassie Behavior WS Today WATER and its emergent properties. (I have a copy of notes being printed) Tonight, complete: Your Binder

Friday, September 8th You must complete your Lab Quiz TODAY (Timed- 35 minutes to complete) THIS GRADE WILL NOT BE A “DROP” OPTION WATER and its emergent properties PPT/Notes I will check binders as I walk around the room This WEEKEND, complete: Water WS

Bonds in Biology Weak bonds-Intermolecular Hydrogen bond Bonds in Biology H2O Weak bonds-Intermolecular hydrogen bonds attraction between + and – hydrophobic & hydrophilic interactions with H2O Strong bonds- Are Intramolecular Ionic or covalent bonds sharing electrons H2O Covalent bond – H2 (hydrogen gas)

Chemistry of Life Properties of Water

Why are we studying water? More about Water Why are we studying water? All life occurs in water inside & outside the cell

Chemistry of water H2O molecules form H-bonds with each other +H attracted to –O creates a sticky molecule APBio/TOPICS/Biochemistry/Movies AP/hydrogenbonds-Thinkwell.swf

Elixir of Life Emergent properties of water 1. cohesion & adhesion surface tension, capillary action 2. good solvent many molecules dissolve in H2O hydrophilic vs. hydrophobic 3. lower density as a solid ice floats! 4. high specific heat water stores heat 5. high heat of vaporization heats & cools slowly Ice! I could use more ice!

Try that with flour… or sugar… 1. Cohesion & Adhesion Cohesion H bonding between H2O molecules water is “sticky” surface tension drinking straw Adhesion H bonding between H2O & other substances capillary action meniscus water climbs up paper towel or cloth Try that with flour… or sugar… Cohesion H bonding between H2O molecules water is “sticky” surface tension capillary action drinking straw Adhesion H bonding between H2O & other substances meniscus water climbs up paper towel or cloth

How does H2O get to top of trees? Transpiration is built on cohesion & adhesion APBio/TOPICS/04Biochemistry/MoviesAP/03_03WaterTransport_A.swf

2. Water is the solvent of life Polarity makes H2O a good solvent polar H2O molecules surround + & – ions solvents dissolve solutes creating solutions 2. Water is a good solvent = the solvent of life Polarity makes H2O a good solvent polar H2O molecules surround + & – ions solvents dissolve solutes creating solutions What dissolves in water easily? polar or non-polar molecules? How about oxygen -- does that dissolve in H2O?

What dissolves in water? Hydrophilic substances have attraction to H2O polar or non-polar? Hydrophilic substances have attraction to H2O

What doesn’t dissolve in water? Hydrophobic substances that don’t have an attraction to H2O polar or non-polar? Oh, look hydrocarbons! Hydrophobic substances that don’t have an attraction to H2O fat (triglycerol)

And this has made all the difference! 3. The special case of ice Most (all?) substances are more dense when they are solid, but not water… Ice floats! H bonds form a crystal Ice! I could use more ice! Most (all?) substances are more dense when they are solid, but not water… Lower density as a solid = Ice floats! H bonds form a crystal And this has made all the difference!

Why is “ice floats” important? Oceans & lakes don’t freeze solid surface ice insulates water below allowing life to survive the winter if ice sank… ponds, lakes & even oceans would freeze solid in summer, only upper few inches would thaw seasonal turnover of lakes sinking cold H2O cycles nutrients in autumn Oceans & lakes don’t freeze solid surface ice insulates water below allowing life to survive the winter if ice sank… ponds, lakes & even oceans would freeze solid in summer, only upper few inches would thaw seasonal turnover of lakes sinking cold H2O cycles nutrients in autumn

Specific heat & climate H2O resists changes in temperature high specific heat takes a lot to heat it up takes a lot to cool it down H2O moderates temperatures on Earth Specific heat H2O resists changes in temperature high specific heat = heats & cools slowly takes a lot to heat it up takes a lot to cool it down H2O moderates temperatures on Earth Specific heat & climate

Wednesday~ 9/7/2016 There are 4 people that need to finish their SD of Hair, NOW~ on podium  Take out Water Notes & WS from Tues. Which of the following is least soluble in water? A. Polar Molecules B. Nonpolar Compounds C. Ionic Compounds D. Hydrophilic Molecules E. Anions

5. Heat of vaporization Evaporative cooling Organisms rely on heat of vaporization to remove body heat

Monday, September 11th Textbooks are here- I will call Mr. Hinton and tell him a good day Turn in A quick Review of Water WS Return graded Lab and Quiz Discuss Strengths and Weaknesses Henrietta Lacks Reading Assignment 1 Given Basic Periodic Table, pH Complete pH and Basic PT WS TOMORROW Emergent Properties of Water Quiz TOMORROW

Ionization of water & pH Water ionizes H+ splits off from H2O, leaving OH– if [H+] = [-OH], water is neutral if [H+] > [-OH], water is acidic if [H+] < [-OH], water is basic pH scale how acid or basic solution is 1  7  14 Water ionizes H+ splits off from H2O, leaving OH– H2O  H+ + OH– if [H+] = [-OH], water is neutral if [H+] > [-OH], water is acidic if [H+] < [-OH], water is basic pH scale how acid or basic solution is 1  7  14 H2O  H+ + OH–

tenfold change in H+ ions 10–1 H+ Ion Concentration Examples of Solutions Stomach acid, Lemon juice 1 pH 100 Hydrochloric acid 10–2 2 10–3 Vinegar, cola, beer 3 10–4 Tomatoes 4 10–5 Black coffee, Rainwater 5 10–6 Urine, Saliva 6 10–7 Pure water, Blood 7 10–8 Seawater 8 10–9 Baking soda 9 10–10 Great Salt Lake 10 10–11 Household ammonia 11 10–12 Household bleach 12 10–13 Oven cleaner 13 10–14 Sodium hydroxide 14 pH Scale tenfold change in H+ ions pH1  pH2 10-1  10-2 10 times less H+ pH8  pH7 10-8  10-7 10 times more H+ pH10  pH8 10-10  10-8 100 times more H+ In pure water only 1 water molecule in every 554 million is dissociated tenfold change in H+ ions pH1  pH2 10-1  10-2 10 times less H+ pH8  pH7 10-8  10-7 10 times more H+ pH10  pH8 10-10  10-8 100 times more H+

Buffers & cellular regulation pH of cells must be kept ~7 pH affects shape of molecules shape of molecules affect function therefore pH affects cellular function Control pH by buffers reservoir of H+ donate H+ when [H+] falls absorb H+ when [H+] rises 1 2 3 4 5 6 7 8 9 Amount of base added Buffering range pH Exercise = acidic in muscles CO2 = carbonic acid lactic acid body uses buffers to counter act this

Do one brave thing today…then run like heck! Any Questions? Do one brave thing today…then run like heck!

Tuesday, September 12th Do a round-table discussion about a Water Question Card . . . (2 minutes) Grade Emergent Properties of Water WS Emergent Properties of Water Quiz- IS TOMORROW! Study your WS RECEIVE HeLa Reading Assignment pH and pOH- how to- calculations Basic Periodic Table- What do you know? Complete Basic Periodic Table Questions

Wednesday, September 13th Properties of Water Quiz TODAY! Once you are done- please go immediately to checkout your AP textbook! 2nd Period- Please have your binders out so I can grade them Complete Basic Periodic Table PPT- What do you know? Complete Basic Periodic Table Questions Watch Ted Talk on HeLa

2nd Period- Please have your binders out Thursday, September 14th Properties of Water Quiz TODAY! 2nd Period- Please have your binders out so I can grade them Complete Basic Periodic Table PPT- Complete Basic Periodic Table Questions- on your own notebook paper Begin the Chemistry of Carbon PPT/Functional Groups Watch Bozeman

If you are still not understanding the “chemistry” Thursday, September 14th Grade and Correct Basic Periodic Table Questions- on your own notebook paper Happy? Turn it in; Unhappy? do redo tomorrow Begin: Chemistry of Carbon PPT/Functional Groups If you are still not understanding the “chemistry” I recommend “The Chemical Context of Life” PPT on my website- there is also a student handout to go along with it

If you are still not understanding the “chemistry” Friday, September 15th Unhappy w/ chemistry WS grade? do redo NOW Continue: Chemistry of C PPT/Functional Group HW and Classwork: 1. Identifying Functional Groups WS 2. Catalase Lab- Read it and Complete Prelab for Monday 3. Study: Water, pH, Chemistry “Resources” Test NEXT Wednesday over them. If you are still not understanding the “chemistry” I recommend “The Chemical Context of Life” PPT on my website- there is also a student handout to go along with it