CHEM 1314 Study Guide - Midterm Guide: Nonmetal, Ionic Compound, Aqueous Solution
Document Summary
Properties of substances depend on the atoms and molecules that compose them. Scientific law- brief statement that summarizes past observations and predicts future ones. Scientific theory- model for the way nature is and tries to explain not merely what nature does but why. Atomic theory by john dalton- matter is composed of small, indestructible particles called atoms. Law of conservation of mass- matter is neither created nor destroyed. Composition- basic components that make it up what it"s made of. Pure substance- one component and uniform throughout element or compound (can be broken down into more elements) Mixture- heterogeneous and homogenous (uniform throughout like coffee) Physical changes- alter only state or appearance, but not composition. Physical property- substance displays without changing composition- smell, taste, color, boiling point, density, etc. Chemical property- substance displays only when the composition is changed by a chemical reaction- flammability, acidity, toxicity, etc. Trailing zeros: zeros after a decimal point are significant.
