CHM 101 Chapter Notes - Chapter 1: Chemical Property, Kilogram, Physical Property
Document Summary
Chemistry- study of matter & changes it undergoes. Macroscopic- things we can see, touch, and measure directly. Microscopic- things we can"t experience w/o modern technology. Systematic approach to research: hypothesis- tentative explanation for a set of observations, law- statement of a relationship between phenomena that"s always the same under same conditions, ex: formulas. Force= mass x acceleration: theory- unifying principle that explains a body of facts/ those laws that are based on them, ex: atomic theory, big bang theory, classifications of matter. Matter- anything that occupies space & has mass: substances & mixtures. Substance- a form of matter that has constant composition & distinct properties. Ex: water, ammonia, table sugar, gold, oxygen. Mixture- combo of 2+ substances where substance retain their distinct identities. Homogeneous- composition of mixture is same (soft drinks, milk) Heterogeneous- composition of mixture is not same (cement, iron fillings in sand) Physical means can be used to separate a mixture into its pure components: elements & compounds.
