History of Chemistry essays

History of Chemistry essays Humans have always been very curios creatures. The have always wondered about what they are and why they are here. Our limited knowledge of the environment has always urged for new things to be discovered. The desire to understand the world better has made people search for rational answers, for principles and laws. For centuries people have tried to unlock the mysterious world that surrounds them. Because myths did not explain things well enough the Greeks began to ask questions about the world around them. They did this so thoroughly and so brilliantly that the era between 600 and 400 B.C. is called the golden age of philosophy. The Greek philosophy was an attempt to find the truth about unexplained phenomena, mostly by trying to think things through, not by running experiments in a laboratory. The philosophers wanted to discover the basic nature of things and some of them believed that they could find one thing that everything else was made of. A philosopher named Thales said that this substance was water, but another named Anaximenes thought it was air. A third called Empedocles said that the world was composed of four elements: earth, air fire and water. Aristotle became the most influential of the Greek philosophers, and his ideas dominated science for nearly two millennia after his death in 323 BC. He believed that four qualities were found in nature: heat, cold, moisture, and dryness. The four elements were each composed of pairs of these qualities; for example, fire was hot and dry, water was cold and moist, air was hot and moist, and earth was cold and dry. These elements with their qualities combined in various proportions to form the components of the earthly planet. Because it was possible for the amounts of each quality in an element to be changed, the elements could be changed into one another; thus, it was thought possible also to change the material substances that were built up from the elements-lead into gold, fo...

A Guide to Business English Collocations

A Guide to Business English Collocations Business English collocations are common combinations of words used when speaking about business in English. Collocations can be understood as words that usually go together. For example, in English we do business, not make business. That business English collocation can make all the difference if you are trying to do business around the world. When decisions concern a lot of money, its important to get the phrase right.   Here are common business English collocations used in various business operations:   The Verb To Do Accounts: Mary does the accounts in bookkeeping.Business: We do business with countries around the world.Deals:  We did a deal with them last year.Due diligence:  Lets do our due diligence before we begin the project.Paperwork: First we have to do the paperwork.Research: Lets do some research on the subject. The Verb To Make An appointment: I made an appointment with the sales manager for next week.A calculation:  She has to make a calculation before she decides whether to approve.Cutbacks:  The company made cutbacks at their stores in New York.A deal: We made a deal with our competitor.An investment: The CEO  made an investment in a new factory.A loan:  The bank made us a loan of $750,000.Money:  The company made a lot of money in the last year.A profit: We  made a good profit on the deal. The Verb To Manage A business or factory: He manages two stores in California.Expectations:  Always manage your expectations during contract negotiations.A project or a team:  Susan is managing five projects at the same time. The VerbsTo Operate or To Run An airline: The company operates/runs an airline in Brazil.A facility:  We operate/run facilities in Germany and Japan.A service: We operate/run a tourist service in Boulder, Colorado. The Noun Deal Cut a deal: We cut a deal with our competition.Do a deal:  The company did a deal in Los Angeles.Give someone a deal:  Let me give you a deal on a new car.Close a deal:  Jake closed the deal yesterday. Hes celebrating today.Work on a deal:  Were working on a deal with a new client. The Noun Contract Write/draw up a contract: Lets write up a new contract for next year. Sign a contract:  Make sure to read it carefully before you sign any contract.Negotiate a contract: Accepting a first offer is no way to negotiate a contract.Offer someone a contract: Wed like to offer you a contract with our company.Bid on a contract: Were bidding on three contracts at the moment. Adjectives Modifying Customer Long-time customer: We treat our long-time customers with great respect and even better deals.Regular customer: Hes a regular customer. He comes in every Friday afternoon.Prospective customer:  Hes pitching the project to a prospective customer.Paying customer:  The only customer we need is a paying customer.Domestic/international customer: We have both domestic and international customers.