Visibly indistinguishable parts o Called solutions o Example: air, brass, salt water o Heterogeneous mixtures Visibly distinguishable parts o Example: sand in water, oil & water o Can be separated into pure substances through physical changes Physical changes do not change the chemical composition of the matter Ways to separate mixtures Distillation separation by boiling point o – Filtration separation method used with a solid & liquid mixture where a – o barrier blocks solid particles from passing through Chromatography a series of methods that employ a system with two phases – o (states of matter) Mobile phase (liquid or gas) Stationary phase (solid) Types of Chromatography Paper Chromatography Column Chromatography Pure substances Matter made up of only one type of element or compound Compound substance with constant composition that can be broken down – o into elements by chemical means Elements a substance that cannot be decomposed into simpler substances – o by chemical or physical means Atoms the most basic unit of matter – Proton positively charged particle – Neutron neutral particle – Electron negatively charged particle – Section 2 Atoms, Molecules, & Ions Fundamental Chemical Laws Antoine Lavoisier (1743-1794)
o Visibly indistinguishable parts o Called solutions o Example: air, brass, salt water Heterogeneous mixtures o Visibly distinguishable parts o Example: sand in water, oil & water Can be separated into pure substances through physical changes Physical changes do not change the chemical composition of the matter Ways to separate mixtures o Distillation – separation by boiling point o Filtration – separation method used with a solid & liquid mixture where a barrier blocks solid particles from passing through o Chromatography – a series of methods that employ a system with two phases (states of matter) Mobile phase (liquid or gas) Stationary phase (solid) Types of Chromatography Paper Chromatography Column Chromatography Pure substances Matter made up of only one type of element or compound o Compound – substance with constant composition that can be broken down into elements by chemical means o Elements – a substance that cannot be decomposed into simpler substances by chemical or physical means Atoms – the most basic unit of matter Proton – positively charged particle Neutron – neutral particle Electron – negatively charged particle Section 2 Atoms, Molecules, & Ions Fundamental Chemical Laws Antoine Lavoisier (1743-1794)
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