Chemistry

chemical science 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 chief(prenominal)? Almost every(prenominal) foods, beverages, and cleaning products have chemic conflates 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 2 or much atoms join to stick byher chemically. A compound is a molecule that contains at least two incompatible elements. All compounds ar molecules, but non all molecules are compounds. Molecule Molecule an uncharged group of two or more atoms held together by covalent bonds speck Atom the smallest particle of a given casing of matter The basic principle of Chemistry All chemical compounds can be isolated based on chemical or physical properties. at a ti me separated, matter can be sort by its chemical or physical properties. bodily Properties physical Properties characteristics of matter exhibited without a change of identity. animal(prenominal) 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 lead change state point colour in immersion Electrical Conductivity Physical State (solid, liquid, gas) Melting call for Melting Point the temperature of a solid when its crystal wicket door gate dis integrates. Melting Points Sand (silicon d! ioxide, or Quartz): 1723 C salinity (NaCl): 801 C Sugar (glucose and dextrose have the same liquescent points): 146 C Copper: 1083.4 C boiling Point Boiling Point the temperature of a liquid when its vapor contract 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

If you want to get a full essay, visit our page: cheap essay