CHEMISTRY The Molecular Science Chapter one The Nature of Chemistry

Molecular Medicine

Designer Molecules

Scientific Method observations –f–facts natural law model –p–predictions –h–hypothesis theory –e–experiments to test the theory

Properties of Matter Extensive Property depends on amount of material present examples: –Mass, volume, heat capacity Intensive Property identical in all samples of the substance examples: –color, density, melting point, specific heat capacity

Properties of Matter Physical Property one that can be observed without changing the substances present in the sample Color, texture, melting point, solubility

Properties of Matter Chemical Property How a substance reacts with other substances or decomposes on its own Na (s) + H 2 O (l)  NaOH (aq) + ½ H 2 (g)

Which of these describes a chemical property of copper (Cu)? 1.Cu is a solid at 25°C and 1 atmosphere pressure. 2.Cu conducts heat and electricity. 3.Cu corrodes in air forming a layer of patina. 4.Cu has a "reddish" color. 5.Cu boils at 2570°C.

Pure Substances Elements Compounds

Mixtures two or more pure substances Heterogeneous Areas of different composition Homogeneous (Solution) Sample uniform throughout, down to a molecular scale

Orange juice is a(n) ? 1.Pure Substance 2.Element 3.Heterogeneous mixture 4.Homogeneous mixture