Chemistry Content Knowledge 5245 Practice Questions and Answers

Homogeneous Mixture distributed uniformly throughout mixture; Air; Solutions Heterogeneous Mixture not distributed uniformly throughout mixture; sand & salt; Suspensions Solute substance that is being dissolved; sugar Solvent substance doing the dissolving; water Physical Properties can be seen or observed; mass, volume, density, color, boing/freezing points, hardness, conductivity Chemical Properties cannot be measured without changing identity or composition of matter; flammability, corrosively, oxidation, reactivity Physical Changes do not produce new substances; rearranged; phase changes; melting, dissolving, crushing Chemical Changes chemical reaction that produces new substances; iron rusts, baking a cake, burning wood, digesting 2 types of physical properties intensive and extensive Intensive Properties do not depend on the amount of matter or quantity of the sample; color, hardness melting/boiling point, density Extensive Properties change if the sample size is increased or decreased; volume, mass, weight, energy, moles, charge First Law of Thermodynamics total energy in an isolated system is constant; E=q+w Electrical Energy energy associated with the movement of electrons or ions through a material Chemical Energy energy stored in chemical bonds Nuclear Energy Energy stored in atoms nucleus