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 authoritative? Almost every(prenominal) foods, beverages, and cleaning products have chemic combines in them to hold 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 both or much atoms join to shoot forher chemically. A compound is a molecule that contains at least two opposite elements. All compounds are molecules, but non all molecules are compounds. Molecule Molecule an uncharged group of two or more atoms held together by covalent bonds subdivision Atom the smallest particle of a given casing of matter The rudiments of Chemistry All chemical compounds can be isolated based on chemical or physical properties. at a time separated, matter can be sort by its chemical or physical properties. bodily Properties animal(prenominal) Properties characteristics of matter exhibited without a change of identity. physical 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 arrest change state point colour in constriction Electrical Conductivity Physical State (solid, liquid, gas) Melting turn on Melting Point the temperature of a solid when its crystal grill gate disintegrates. M elting Points Sand (silicon dioxide, or Qua! rtz): 1723 C brininess (NaCl): 801 C Sugar (glucose and dextrose have the same melt points): 146 C Copper: 1083.4 C boil Point Boiling Point the temperature of a liquid when its vapor blackjack 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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