Basic Chemistry Review AND Properties of Water

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Presentation transcript:

Basic Chemistry Review AND Properties of Water

TEKS No high school TEKS for properties of water You need to know them to understand how water helps to create a phospholipid bilayer (Cell/Plasma Membrane) for TEKS 4B

Vocabulary Valence Electron Polar/Polarity Hydrogen Bonding Cohesion Adhesion Hydrophobic Hydrophilic

Prerequisite Questions What is the chemical formula for Water? What are the 3 states of matter? (What do you call water at each state?) What happens to a chemical when it moves from one state to another at the molecular level? What can you state about two oppositely charged particles? What about two similarly charged particles?

Periodic Table Review

Octet Rule Most Main Group elements are electrically more comfortable with a full outer valence shell

Formation of Salt (Ionic Bonding) Sodium will give away its outermost valence electron because it can fall back on a full inner shell. (Completes the octet rule) Chlorine will accept one more electron to complete its valence shell.

Covalent Bonding Covalent bonds form between two atoms sharing electrons. A single covalent bond is made of 2 shared electrons. Oxygen’s electrons are pink in the picture. Hydrogen’s electrons are white in the picture Covalent Bond

Water is a Polar Molecule The electrons in a water molecule spend more time around the Oxygen nucleus than the other two Hydrogen nuclei. That makes the oxygen region of a water molecule more negative, while the hydrogen regions are more positive. __ + +

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