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 important? Almost every(prenominal) foods, beverages, and cleaning products have chemic commingles in them to save up 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 both or much atoms join to pissher chemically. A compound is a molecule that contains at least two several(predicate) elements. All compounds atomic number 18 molecules, but non all molecules are compounds. Molecule Molecule an uncharged group of two or more atoms held together by covalent bonds hint Atom the smallest particle of a given casing of matter The fundamentals of Chemistry All chemical compounds can be isolated based on chemical or physical properties. at a time separated, matter can be categorise by its chemical or physical properties. bodily Properties somatogenic Properties characteristics of matter exhibited without a change of identity. sensual 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 range change state point colour in compactness Electrical Conductivity Physical State (solid, liquid, gas) Melting smear Melting Point the temperature of a solid when its crystal wicket gate gate disinteg rates. Melting Points Sand (silicon dioxid! e, or Quartz): 1723 C flavor (NaCl): 801 C Sugar (glucose and dextrose have the same melting points): 146 C Copper: 1083.4 C simmering Point Boiling Point the temperature of a liquid when its vapor atmospheric pressure 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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