Shapes of Molecules

The shape of a molecule determines many of its properties; For example: C4H10 is the formula for 2 separate molecules n-butane and isobutene Melting Point    -138°C                   -159°C Boiling Point     -0.5°C                    -12°C Enzymes—shape compatible with those molecules whose reactions they promote i.e.  the enzyme sucrase breaks down the sugar molecule sucrose The shape of a…

Rate Laws and Order of Reaction

Chemical reactions only take place when there are collisions between reactants Depends on: Number of collisions per unit time Fraction of collisions which are successful There is a relationship/pattern between reaction rate and the factors that affect it This pattern can only be determined empirically (through experimentation) Rate Law Empirical evidence supports that the reaction…

The Respiratory System: Structure and Function

Function supplies oxygen to cells and removes carbon dioxide defending the body against invasion of microorganisms control the body’s blood pH Components: Ventilation (breathing) > inhalation and exhalation; take in oxygen and dispose of carbon dioxide External Respiration > the exchange of gases between the alveoli and the blood Internal Respiration > exchange of gases…