CHP 1 : Basic Elements in Life

~ inert medium for CHEMICAL REACTIONS in living org~ medium of TRANSPORT for DISSOLVED nurtrients~ heat carrier & DISSIPATES heat ~ important environmental factor that affects life of organisms~ evolution of biological systems

Hydrogen Bond

- oxygen (high electronegativity) electrons pulled towards o2 nucleus- giving o2 partial (-) charge and hydrogen partial (+) charge- covalent bond forms with hydrogen atoms due to asymmetrical distribution of electrons- electrical attraction between the partial (+) & (-) charges on water molecules from the BOND

Water is liquid at room temperature

high boiling point = 100C~ heat energy need to break the hydrogen bonds first~ to increase the movement of molecules (kinetic energy), which increases the temp

Water is the universal solvent

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