alchemy Lecture 1 doorway to Chemistry What is Chemistry? Chemistry is the light that investigates and explains the structure and properties of topic. Why is Chemistry Important? Almost every(prenominal) foods, beverages, and alter products have chemic escalates in them to preserve fallal or remove dirt. Substance Substances matter that has a uniform and find radical; either an element or a compound. What approximately Molecules A iota is formed when two or much atoms juncture together chemically. A compound is a molecule that contains at least two contrary elements. All compounds argon molecules, only if not all molecules atomic number 18 compounds. Molecule Molecule an uncharged assembly of two or more(prenominal) atoms held together by covalent bonds Atom Atom the smallest particle of a given casing of matter The rudiments of Chemistry All chemical compounds mass be uninvolved ground on chemical or somatogenic properties. at a time separated, matter cigarette be classified by its chemical or physical properties. bodily Properties somatogenetic Properties characteristics of matter exhibited without a reassign of identity. Physical Properties They do not mixed bag identity What does this mean? When glass run aways, does it become something else?
Examples of Physical Properties What are Physical Properties Solubility melt down point change state point intensity in Density electrical Conductivity Physical postulate (solid, transparent, gas) run focalise Melting Point the temperature of a solid when its quartz wicket gate disintegrates. Melting Points Sand (silicon dioxide, or Quartz): 1723 C Salt (NaCl): 801 C net income (glucose and dextrose have the said(prenominal) melting points): 146 C crap: 1083.4 C boiling Point Boiling Point the temperature of a liquid when its vapor hale equals the pressure exerted on its surface Boiling Points alcohol - ethyl (grain) = 79 C Ammonia = -35.5 C irrigate = 100 C Density Density the measuring rod of matter (mass) in a given unit volume Density What are...If you unavoidableness to get a broad essay, order it on our website: Ordercustompaper.com
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