MATTER Ch 4 Classification of Matter II Composition

MATTER Ch. 4 - Classification of Matter II. Composition of Matter w Matter Flowchart w Pure Substances w Mixtures

A. Matter Flowchart See lecture handout. MATTER yes MIXTURE yes Is the composition uniform? Homogeneous Mixture (solution) no Can it be separated by physical means? PURE SUBSTANCE no Heterogeneous Mixture yes Can it be decomposed by chemical means? Compound no Element

B. Pure Substances ö Element w matter composed of identical atoms w EX: copper

B. Pure Substances ö Compound w matter composed of 2 or more elements in a fixed ratio w properties differ from those of individual elements w EX: salt (Na. Cl)

C. Mixtures ö Variable combination of 2 or more pure substances. Use the remaining info to fill in the table on the lecture handout. ö Homogeneous Mixture (Solution) w even distribution of components w very small particles w particles never settle w EX: saline solution

C. Mixtures ö Heterogeneous Mixture w uneven distribution of components w colloids and suspensions w EX: granite

C. Mixtures ö Colloid w medium-sized particles w Tyndall effect - particles scatter light (looks cloudy) w particles never settle w EX: milk

C. Mixtures ö Suspension w large particles w particles scatter light w particles will settle (needs to be shaken) w EX: fresh-squeezed lemonade