Can be separated by physical means Homogeneous mixtures are the same consistency and composition throughout the sample, also known as solutions. Heterogeneous mixtures are not the same throughout. Measurements You should be able to do conversions within the metric system for length, mass, and volume. Make sure you know the common prefixes used in the metric system. Accuracy refers to how close to the true value a given measurement is.
Precision refers to how close a set of measurements are to each other.
Significant Figures Significant figures are the total number of digits in a measurement that indicate the precision of the measuring apparatus. They include all the digits you are sure of plus one additional digit that you estimate. Periodic Table Horizontal rows are called periods while vertical columns are called groups. Groups can be labeled in two common ways as given in the textbook. The way I prefer to number them is by the Roman numeral method.