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BYU-I - BIO 264 - BIO 264 Week 2 Notes - Class Notes

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BYU-I - BIO 264 - BIO 264 Week 2 Notes - Class Notes

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background image Day 4  No School MLK Day Day 5  Truth: The Foundations of Correct Decisions Elder Scott Ion- whenever there is an unequal number of protons and electrons 
Cation – positive ions, more protons than electrons
Anion- negative ions, more electrons than protons 
Na is usually a cation because it will give away it’s one electron to become 
stable so it is drawn as Na+
Ionic Bonds- bond of ions, positive and negative - usually pairing between 
group 1 & 7, 2&7 because group 1 wants to get rid of an electron and group 
7 needs one
Groups 1 & 2 will get rid of electrons instead of gaining them  Mg2+I2
H2O
Atomic Number- Number of Protons  Mass number – number of  protons  + neutrons  Carbon12 – 12 =  + N; N = 6  Carbon14 – 14 =  6  + N; N = 8  Isotope – same number of protons and different number of neutrons  Valence electrons are the outer most shell  Atomic Mass- is the average weight of the element in the universe, it is the 
number at the bottom of the square on the periodic table 
Day 6 
 Ionic Bonds 
- always requires a cation and an anion
- Unequal number of protons and electrons
- Disassociates in water
- Can transfer electrons (gives it away and doesn’t want it back)
background image Anion – Negative charge (Cl-) 
Cation – Positive chare (Na+)
Covalent Bonds - Share electrons  Polar Bonds  - Hydrogen and Oxygen bonds 
- Unequal sides 
- H2O
Nonpolar Bonds - Carbon Carbon bonds 
- Two of the same element are automatically nonpolar bonds
- Carbon Hydrogen bonds (oils) 
- Equal on both sides
- CO2
Least to Most Polar Bonds - Moves from left side of the Periodic Table to the right side 
- left side doesn’t want electrons (not bullies) right side does (bullies)
C-C - nonpolar
C-H - nonpolar
C-N - polar
C-O – polar
Hydrogen Bonds - requires a hydrogen and either a nitrogen, oxygen, or fluorine (NOF)
- intermolecular force
o moves across molecules  - stick to each other they aren’t sharing electrons Cohesive - stick to each other
- water molecules
Adhesive - sticks to other things  Properties of Water  - Hydrogen bonds with other water molecules
- Polar covalent Bonds
- Stabilizes body temperature 
- Adhesion (sticks to other polar substances)
- Cohesion (sticks to other water molecules)
- Lubricant
- Chemical Reactions

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School: Brigham Young University - Idaho
Department: Biology
Course: Human Anatomy and Physiology I
Professor: Lanning Baker
Term: Fall 2016
Tags:
Name: BIO 264 Week 2 Notes
Description: Class Notes for this week
Uploaded: 01/15/2018
6 Pages 29 Views 23 Unlocks
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