BIOL 1107 1nd Edition Lecture 6 Outline of Last LectureI. Amino AcidsII. Protein AssemblyIII. Different Structures of ProteinOutline of Current Lecture I. WaterII. Adhesion & CohesionIII. Water as a SolventIV. pHV. Acids & BasesCurrent LectureI. WaterOnly element in the work to exist in all three states (gas, liquid and solid)Your body: 70% water (saliva, keeping joints lubricated, regulating body temperature,etc.)Why does ice float? Weird phenomenon that only happens with water, usually most solids sink into their liquid phasesIce is able to float on liquid water, because of its crystal structure and hydrogen bonds II. Adhesion & CohesionAdhesion: water has ability to stick to other molecules/structures (through hydrogen bonding)Cohesion: stick to other water molecules (through hydrogen bonding)Example: trees taking up water from the roots (against gravity)III. Water as a SolventPolar- ex: sugar (glucose)These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.Ionic- ex: salt (NaCl)Calculations:Q: You mix 50 mL of a 500 g/L stock solution with 450 mL of water. What is your final concentration in g/L?(a) 0.55 g/L(b) 50 g/L(c) 55.5 g/L(d) Not sureA: Make sure to convert all mL to L. M1 = 500 g/LV1 = 0.050 LM2 = xV2 = 0.50 L (add 0.050 L and 0.450 L)M1 V1 = M2 V2 X = M2 = 50.0 g/LWhy are calculations important?Minor calculation mistakes have caused fatalities in the past: For example, mother offour dies after blundering nurse administers TEN times drug overdose. Additionally, afatal zinc overdose in a neonate (confusion of micrograms vs. milligrams)IV. pHWhat is pH? –log (hydronium concentration)pH scaleHow is pH measured?- pH of pure water is 7- [H+] of pure water is: 1.0 X 10^-7- [OH-] of pure water is: 1.0 X 10^-7- A solution with an [OH-] of 10^-4 has pH of? 10Q: A solution has pH= 10. If you increase the [H+] 100 fold, what will the new pH be? A: 8Q: A pH 7 solution has _____ the [H+] concentration than solution at pH 5?A: 100 times lessQ: You have a solution with a pH of 4. If you double the [H+], what is your new pH?A: pH = approx. 3.7-3.8Q: A solution has a [H+] of 2.0 X 10^-5. What is the approximate pH of solution?A: pH= 4.7-4.8V. Acids & BasesAcids: something donates H+Bases: receives H+; donates OH-(Will talk more about acids & bases in next
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