CHEM 210 Chapters 1-3 Questions & Answers(Graded A)

Chemistry - ANSWERthe study of matter and the changes that matter undergoes Matter - ANSWERAnything that has a mass and occupies space Observations - ANSWERNatural phenomena and measured events; if universally consistent, can be stated as a law Hypothesis - ANSWERTentative explanation that explains observations Experiment - ANSWERProcedure to test hypothesis; measures one variable at a time Model (Theory) - ANSWERSet of conceptual assumptions that explains data from accumulated experiments; predicts related phenomena Further Experiment - ANSWERTests predictions based on model Chemists classify matter as? - ANSWERsubstance or mixture A substance can be further categorized as - ANSWERelement or compound Substance - ANSWERa form of matter that has definite (constant) composition and distinct properties The three physical states a substance can exist - ANSWERsolid, liquid and gas Condensed Phases - ANSWERsolids and liquids Fluids - ANSWERgases and liquids Element - ANSWERa substance that cannot be separated into simpler substances by chemical means Compound - ANSWERa substance composed of atoms of two or more elements chemically united in fixed proportions A compound cannot be separated into simpler substances by - ANSWERany physical process