Write Lewis dot symbols for the following atoms and ions: (a) I, (b) I2, (c) S, (d) S22, (e) P, (f) P32, (g) Na, (h) Na1, (i) Mg, ( j) Mg21, (k) Al, (l) Al31, (m) Pb, (n) Pb21.
September 5th Fundamentals Matter has mass and occupies space → energy is not matter Chemical changes changes in bonding between atoms Ex. burning a log, rust forming on an old car, fermenting grains into alcohol Physical changes changes in physical composition Ex. concentrating alcohol in a mixture through distillation, melting Classifying Matter Mixtures can be separated by physical process Heterogeneous mixture not uniform in composition; when individual parts are taken out of the mixture, the ratio is not the same in other areas of the mixture Ex. a pile of multiple candy bags Homogeneous mixture unif