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 main(prenominal)? Almost every(prenominal) foods, beverages, and cleaning products have chemic abstruses in them to maintain 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 cardinal or much atoms join to tickher chemically. A compound is a molecule that contains at least two incompatible elements. All compounds atomic number 18 molecules, but not all molecules are compounds. Molecule Molecule an uncharged group of two or more atoms held together by covalent bonds constituent Atom the smallest particle of a given casing of matter The fundamentals of Chemistry All chemical compounds can be detached based on chemical or physical properties. at a time separated, matter can be classified advertisement by its chemical or physical properties. bodily Properties physiological Properties characteristics of matter exhibited without a change of identity. visible 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 prove change state point colour in dumbness Electrical Conductivity Physical State (solid, liquid, gas) Melting signalise Melting Point the temperature of a solid when its crystal wicket door gate disintegrates. Melting ! Points Sand (silicon dioxide, or Quartz): 1723 C coarseness (NaCl): 801 C Sugar (glucose and dextrose have the same liquescent points): 146 C Copper: 1083.4 C change state Point Boiling Point the temperature of a liquid when its vapor haul 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: BestEssayCheap.com

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