Posted in: Schools, Uncategorized G. Chemistry 1 Written by Elaine Liu October 17, 2020October 18, 2020 Leave a Comment on G. Chemistry 1 Substances’ properties and reactions. Properties to identify a substance: intensive: independent of amount (color of gold) extensive: depend on amount. (the quantity of gold in a sample) chemical: behavior in a chemical reaction physical: melting and boiling point by measuring its properties and comparing them with the properties for known substances. The law of conservation of mass. Physical: density solubility (saturated, unsaturated) Color; absorption spectrum Elements Mercury (Mn) to get: heating red mineral cinnabar (process) Properties Uses high density liquid barometer, manometer can dissolve many mental, forming solutions (amalgams) a silver-mercury-tin amalgam in teethfillng Aluminum (Al) exist: combined form in clays and rocks. Process to obtain the element: Hall and Herroult process extracting Al from bauxite. Properties Uses Compounds have fixed compositions elements don’t keep their original form. methods to resolve compounds into their elements: heating electrolysis Sodium chloride 单击 “编辑” 按钮更改此文本。这是测试文本。 切换 #2 单击 “编辑” 按钮更改此文本。这是测试文本。 Mixtures no fixed compositions. each substances (either elements or compounds) remains its chemical identity. Homogeneous: solution = solvent + solutes (brass) Heterogeneous: rocks methods to separate mixtures to get elements or compounds: Ho solid-liquid mixture – distillation He solid-liquid mixture – filteration chromatography: due to different solubility and/or absorption (gas-liquid chromatography: car exhaust test or drug test. ) Measurements length volume mass temperature Uncertainties in measurements: significant figures (*/; +-) scientific notation round off A number that is spelled out (parameters and prefix independent variable) does not affect the number of significant figures. Share this:TwitterFacebookLike this:Like Loading...