Exploring Biology's Basics Through Interactive Presentations
Dive into the fundamentals of biology with engaging slides covering topics like atoms, molecules, bonds, and periodicity. Discover the key elements that make up life and unravel the mysteries of biology in a visual and informative way.
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Presentation Transcript
1 Groups This will involve after-class work I'm going to try pairing you by "morning person/night person" categorization
2 Vocabulary bond H-bond donor polar H-bond acceptor covalent molecule hydrophobic hydrogen interaction electronegativity
3 Where now/where next Never build your intellectual edifice on sand Now we have atoms Today we'll learn about them Then we'll join them: bonds Then we'll make things : water, oil, detergent Then we'll see how these properties combine to make a code of life
4 Ah, the periodicity +3 +5+6+7+8 +1+2 K M J +4 R Q S B Z H A P Y The table shows you electrons
5 It's always patterns in data PatternMaster How surgeons know to wash hands (it wasn't obvious?) Cholera isn't fog http://bit.ly/FillDemo
6 Pop quiz... which are the Atoms in nucleotides (DNA)? Atoms in amino acids (protein)? Atoms in sugars/carbohydrates? Atoms in lipids/fats? (C, H, O, N, S, P)
7 What is this atom of which you speak? https://www.britannica.com/science/atom/The-laws-of-quantum-mechanics
8 What matters Note that all of biology springs 6 MAJOR atoms (C, H, O, N, S, P) and a sprinkling of others (P, Ca, Mg, Fe ) We need only 2-3 simple properties, mainly '8' & 'Lust for ELECTRONS' Atoms are real
9 Art by Bruce Eight is the ONLY-est number http://www.green-planet-solar- energy.com/images/neon-bohr.gif
10 What s wrong here? http://www.green-planet-solar- energy.com/images/fluorine-bohr.gif Dissect: halogen (halo-gen) Def'n: salts conduct electricity
11 OK, here? http://www.green-planet-solar- energy.com/images/oxygen-bohr.gif
Ooops.... 12 http://www.green-planet-solar- energy.com/images/sodium-bohr.gif These explosively give up spare electrons to the oxygens in H2O
13 A franchise built upon stupid nomenclature
Bond... covalent bond 14 You complete me Sharing of electrons Each atom gets to count both sharedelectrons towards its goal of eight (two if hydrogen)
15 Feel the power Special rule: two is enough!!! @3 @5@6@7 @1@2 @4 @8 How many e- does H need (goal: 2) How many e- does O need (goal: 8) So... how many H partners to satisfy O?
16 Feel the power Special rule: two is enough!!! @3 @5@6@7 @1@2 @4 @8 How many e- does H need (goal: 2) How many e- does C need (goal: 8) So... how many H partners to satisfy C?
17 Come together Biology: The Science of Live Purves, 7th ed.
18 electron collecting: Pieces of Eight --Hydrogen fills with only two --in all cases, outer shell, not total +1 -4 -3 -2 -1 +2 SHARING 'counts' (to eight) the same as HAVING Fig 2-8
19 Sharing kinda Badder Gooder
20 Doubt whispered in my ear You re not strong enough to withstand the storm. Today I whispered in Doubt s ear I am the storm. adapted from the web
21 => Definition <= Molecule: a collection of atoms all joined one to another by covalent bonds (aka permanently shared electrons) 2 electrons HOH
22 How to shorthand molecules Carbon Hydrogen Oxygen Nitrogen
23 Molecule: Three views of Water (Study hint:this matters) H2O HOH (+) (-) HOH You need to learn all of these representations. Today
24 More to the story Am I perfect or what? So close! Just 1 more, please! Losing one, I become helium-like The quickest route to 8/full determines path Sharing electrons is competitive
26 Science Have we demonstrated the existence of electrons? Molecules? Charges? Discuss It ain't what you don't know that gets you into trouble. It's what you know for sure that just ain't so. --Mark Twain What DO you know? Discuss Prepare to present briefly to the class: the pepper experiment the paperclip experiment the balloon experiment oil or water vs. wax paper or Al foil
