Week of 9.2.19

    Quiz: half lives------

    Notes from chapter 2:
    Quick dive into pH:
    pH of perfect acid is 0, which has a pOH of 14
    water has pH of 7 and pOH of 7
    pH of perfect base is 14, pOH is 0
    pH is LOWER the stronger the acid
    n.b. the pH and pOH always add to 14:
    water is pH 7 and pOH 7
    some acid might be pH 2 and pOH 12
    some base might be pH 12 and pOH 2

    Here's why:
    pH is the -log10 of the [H+], so larger numbers are actually closer to zero
    log10 of 1EE-14 is -14
    log10 of 1EE-1 is -1
    See? The negative sign in the formula makes these into positive numbers, so:
    pH of acid is 1, pH of base is 14

    As if that was not enough for one module...
    Chemical reactions: usually involve movement of energy (light, heat), no mass is created or destroyed (conservation of matter)
    melting and boiling don't count, sorry

    Organic stuff (this could be an entire separate chapter)
    Organic=contains carbon, the base for life on our planet usually C-H or C-C bonds.
    Look on the periodic table below Carbon, we could be Silicon, but we'd have to be lava creatures since the energy needed for chemical reactions would be higher.
    n.b. some thermal creatures use thermosynthesis instead of photosynthesis, using sulfur instead of oxygen (look again at the periodic table)

    Inorganic=either no carbon, or bound carbon (C02, like in carbon dioxide)

    Proteins, fats and carbohydrates: all contain C-H-O in some combination, only proteins have N as well...
    Dive deep if you dare:
    CHO=carbohydrates (clever name), usually in a chain, short chains are sugars (used for fuel), longer ones are starches and can be used for structures (e.g. cellulose in plants) or pasta...

    Fats/lipids: same chemical structure as CHO, but built along a glycol (alcohol) backbone. If the fats have long carbon chains with only single bonds, they are saturated (lots of Hydrogen atoms) and can hold together (e.g. animal fat)
    If the long chains have double bonds and don't fit together, they melt easier (e.g. oils) and are called "unsaturated", usually better for your health.
    n.b. McDonalds® got into real hot water a while ago for frying all of their stuff in "supersaturated fats". Ugh...

    Proteins: complex molecules of CHO and N. Look up amino acids, note the common structure.
    Now look up the amino acid methionine. What element does it contain as well? Why do rotten eggs, swamps (and Kilauea volcano) stink?

    Nucleic acids: DNA and RNA (another whole chapter)

    quiz 9.5.19

    1. What is the difference between carbohydrates, fats and proteins?
    2. How much more acidic is something with a pH 4 than one of pH 5?
    3. An element has a half-life of 30 days. If the original sample is 100 grams, how many grams will remain after 45 days?
    4. Which is more acidic: NaOH or HCl? Why?

    Module 5 (FINALLY!)
    Energy is the ability to do work (heard that before?)
    Units are joules ("jowles in England), and a few others (calories, Calories, BTU, kWh)

    Power is how fast you can do the work (climbing stairs or running up stairs), so Power = work/time
    Units are Watts (joules per second or j/s) among others

    energy->Joules (work~amount of water)

    power->Watts (how fast the work is done~flow)

    KE/PE: Kinetic and potential energy

    PE: chemical bonds, height, spring

    KE: motion, freewheel, flowing air/water

    temp: KE=1/2mv^2 (macro level)

    molecular level:

    KE=3/2kT, so T prop to v^2 of molecules

    EMR: shorter wavelengths more energy e.g. UV, X-rays
    Light is one form of EMR or electromagnetic radiation (needs no medium, so we get light from the sun through the vacuum of space)
    What you need to know: EMR has higher energy with higher frequency (e.g. ultraviolet light damages DNA, infrared heat can only burn)
    See visible spectrum:

    Energy can be potential (ability to do work) like altitude or chemical bonds or kinetic (see Kinesias in Lysistrata), the energy of motion or heat (molecules in motion, KE = 3/2kT)
    Temperature is not heat, but the average speed of the molecules...
    Temp in the upper atmosphere is 900°C but you'd freeze there, as there is no atmosphere to conduct the heat to you.
    Interesting fact: Concorde passengers could not touch the windows, not because they were too cold from the altitude, but too hot from the air friction of the plane going 2x the speed of sound.

    Thermodynamics (heat in motion)
    Laws: Physics version
    1. you can't win (no such thing as more than 100% efficiency)
    2. you can't break even (not even 100% is possible, there is always a "heat tax" on every reaction)
    3. you can't get out of the game (all reactions tend towards disorder, the "heat death" of the universe, or ∆S>0 for the universe)

    Chemical version:

    1. energy cannot be created or destroyed
    2. energy can move, but always at a cost (entropy, disorder increases, ∆S>0 universe)

    Efficiency is the amount you get out of any energy reaction, divided by the amount that went in, always less than 100%
    efficiency; never 100%, 30-60% common
    Human 35% eff, diesel engine 60%

    Energy "quality" is the degree of organization of the energy (sugar molecules vs. heat coming from your body, or well organized gasoline "octane" molecules breaking into heat, CO2 and H2O)

    Entropy: degree of disorder in any system, all reactions tend towards more disorder (e.g. your closet or bedroom-tell this to your parents)
    energy quality-entropy, disorder, e.g. closet ∆S>0, takes energy input to reduce S (entropy)

    System dynamics----- (had enough yet?)
    Open system: stuff comes in, goes out, e.g. energy
    Closed system: everything stays in e.g. mass
    Steady state: balance of inputs and outputs (money example)
    Feedback: think of the howling speakers at assembly: microphone picks up the speaker, gets louder, goes on and on: positive feedback
    Positive feedback: response makes the situation stronger/unstable: capsizing ships, childbirth, bleeding to death, climate change, melting permafrost, albedo decrease in the arctic...
    Negative feedback: response makes the situation more stable, tends towards recovery: stable ships at sea, sweating, good relationships

    ----quiz 9.6.19 Friday-----

    Quiz 9.6.19

    1. Explain the difference between energy and power
    2. UV radiation will cause sunburns but infrared will not. Why?
    3. What are the 3 laws of thermodynamics?
    4. Give an example of positive and negative feedback


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