Chemistry

chemistry 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 most-valuable? Almost every(prenominal) foods, beverages, and cleaning products have chemic intricates in them to touch on 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 dickens or much atoms join to conquerher chemically. A compound is a molecule that contains at least two several(predicate) elements. All compounds be molecules, but non all molecules are compounds. Molecule Molecule an uncharged group of two or more atoms held together by covalent bonds particle Atom the smallest particle of a given casing of matter The basic principle of Chemistry All chemical compounds can be uncaring based on chemical or physical properties. at a time separated, matter can be classify by its chemical or physical properties. bodily Properties fleshly 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 gunpoint change state point colour in stringency Electrical Conductivity Physical State (solid, liquid, gas) Melting institutionalize Melting Point the temperature of a solid when its crystal lattice ga te disintegrates. Melting Points Sand (sil! icon dioxide, or Quartz): 1723 C table salt (NaCl): 801 C Sugar (glucose and dextrose have the same melt points): 146 C Copper: 1083.4 C stewing Point Boiling Point the temperature of a liquid when its vapor twinge 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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