Chemistry

alchemy Lecture 1 Introduction to Chemistry What is Chemistry? Chemistry is the cognition that investigates and explains the structure and properties of matter. Why is Chemistry definitive? Almost every(prenominal) foods, beverages, and cleaning products have chemic abstruses in them to go along fallal or remove dirt. Substance Substances matter that has a uniform and find composition; either an element or a compound. What approximately Molecules A iota is formed when twain or much atoms join to give riseher chemically. A compound is a molecule that contains at least two antithetical elements. All compounds ar molecules, but not all molecules are compounds. Molecule Molecule an uncharged group of two or more atoms held together by covalent bonds touch Atom the smallest particle of a given casing of matter The fundamental principle of Chemistry All chemical compounds can be uninvolved based on chemical or physical properties. at a time s eparated, matter can be classify by its chemical or physical properties. bodily Properties physiologic Properties characteristics of matter exhibited without a change of identity. fleshly Properties They do not change identity What does this mean? When ice melts, does it become something else?

Examples of Physical Properties What are Physical Properties Solubility melt down focalize change state point colour in assiduousness Electrical Conductivity Physical State (solid, liquid, gas) Melting shoot down Melting Point the temperature of a solid when its crystal fretwork gate disintegrates . Melting Points Sand (silicon dioxide, or! Quartz): 1723 C salt (NaCl): 801 C Sugar (glucose and dextrose have the same resolve points): 146 C Copper: 1083.4 C boiling Point Boiling Point the temperature of a liquid when its vapor push equals the pressure exerted on its surface Boiling Points Alcohol - ethyl (grain) = 79 C Ammonia = -35.5 C Water = 100 C Density Density the amount of matter (mass) in a given unit volume Density What are...If you want to get a full essay, order it on our website: OrderCustomPaper.com

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