BIOCHEMISTRY 2-2. PROPERTIES OF WATER Polarity- Water is polar because of the uneven distribution of electrons between the O and the H.

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Presentation transcript:

BIOCHEMISTRY 2-2

PROPERTIES OF WATER Polarity- Water is polar because of the uneven distribution of electrons between the O and the H.

PROPERTIES OF WATER Hydrogen bond- Water molecules bond to other water molecules. A substance that is attracted (can bond) to itself is known as cohesion.

PROPERTIES OF WATER Adhesion- attraction of molecules of different substances.

ASSIGNMENT Make a water molecule!

THE *CHEMISTRY OF *WATERCHEMISTRYWATER Key words: Polarity/Dipole, Cohesive, Adhesion, How does Water’s solubility break down a compound such as salt? *Water is life…

WATER OLYMPICS

Mixture- material composed of two or more elements or compounds that are physically mixed but not chemically combined.

Solution- liquid mixture Solute- the substance that is dissolved. Solvent –the substance into which the solute dissolves.

ACIDS, BASES AND PH Acids- A solution that can donate a hydrogen ion- a proton to another substance. Have a higher H+ concentration. Generally written in an equation as H(x) Ex. HCl, HF, HBr Acids are substances that have a pH of less than 7.0

ACID PROPERTIES Taste- sour when dissolved in water- lemon, lime, grapefruit Touch- acids produce a burning or stinging sensation.

ACID PROPERTIES Reactivity- react aggressively with most metals. Electrical Conductivity- can conduct a current depending on the strength of the acid. Litmus paper- turns paper red

BASE PROPERTIES A solution that can accept a hydrogen ion- a proton- from another substance. A base is any solution that has a pH greater than 7.0

BASE PROPERTIES Taste- bitter Tough- slimy or soapy feeling.

BASE PROPERTIES Reactivity- react violently with acids and can cause burning. Electrical Conductivity- in solutions such as water will conduct electricity. Litmus paper- turns paper blue

PH SCALE = POTENTIAL OF HYDROGEN Identifies a substance as acidic or basic = acidic 0-4 strong acid weak acid = basic = weak base = strong base

BUFFER Weak acids or bases that balance strong acids/bases in the body to help keep the body in homeostasis.

ASSIGNMENT