nuclear reactions essays

nuclear reactions essays Chemical reactions are the heart of chemistry. People have always known that they exist. The Ancient Greeks were the first to speculate on the composition of matter. They thought that it was possible that individual particles made up matter. Later, in the Seventeenth Century, a German chemist named George Ernst Stahl was the first to postulate on chemical reaction. He said that a substance called phlogiston escaped into the air from all substances during combustion. He explained that a burning candle would go out if a candle snuffer was put over it because the air inside the snuffer became saturated with phlogiston. Stahl also said that phlogiston will take away from a substance's mass or that it had a negative mass, which contradicted his original theories. In the Eighteenth Century Antoine-Laurent Lavoisier, in France, discovered an important detail in the understanding of the chemical reaction combustion, oxigine (oxygen). He said that combustion was a chemical reaction involving oxygen and another combustible substance, such as wood. John Dalton, in the early Nineteenth Century, discovered the atom. It led to the idea that a chemical reaction was actually the rearrangement of groups of atoms called molecules. Dalton also said that the appearance and disappearance of properties meant that the atomic composition dictated the appearance of different properties. He also came up with idea that a molecule of one substance is exactly the same as any other molecule of the same substance. People like Joseph-Lois Gay-Lussac added to Dalton's ideas with the postulate that the volumes of gasses that react with each other are related. Amedeo Avogadro also added to the understanding of chemical reactions. He said that all gasses at the same pressure, volume and temperature contain the same number of particles. This idea took a long time to be accepted. His ideas lead to the subsc ...

A Quick Tour of the First McDonalds

A Quick Tour of the First McDonald's Founder Ray Kroc’s first McDonald’s, known as Store #1, opened on April 15, 1955, in Des Plaines, Illinois. This first store sported a red-and-white tile building and the now very recognizable large Golden Arches. The first McDonald’s offered lots of parking (no inside service) and featured a simple menu of hamburgers, fries, shakes, and drinks. Origins of the Idea   Ray Kroc, the owner of Prince Castle Sales, had been selling Multimixers, machines that allowed restaurants to mix five milkshakes at one time, since 1938. In 1954, 52-year-old Kroc was surprised to learn of a small restaurant in San Bernadino, California that not only had five Multimixers but used them nearly non-stop. Before long, Kroc was on his way to visit. The restaurant that was using the five Multimixers was McDonald’s, owned and operated by brothers Dick and Mac McDonald. The McDonald brothers had originally opened a restaurant called McDonald’s Bar-B-Q in 1940 but revamped their business in 1948 to focus on a more limited menu. McDonalds sold only nine items, which included hamburgers, chips, slices of pie, milkshakes, and drinks. Kroc loved the McDonald’s concept of a limited menu with fast service and convinced the McDonald brothers to broaden their business with nation-wide franchises. Kroc opened his first McDonald’s the following year, on April 15, 1955, in Des Plaines, Illinois. What Did the First McDonald’s Look Like? The very first of Ray Kroc’s McDonald’s was designed by architect Stanley Meston. Located at 400 Lee Street in Des Plaines, Illinois, this first McDonald’s had a red-and-white tile exterior and large Golden Arches that flanked the sides of the building. Outside, a large red and white sign announced the â€Å"Speedee service system.† Ray Kroc wanted quality with quick service and so the first McDonald’s character was Speedee, a cute little guy with a hamburger for a head. Speedee stood on top of that first sign, holding another sign advertising â€Å"15 cents† – the low cost of a hamburger. (Ronald McDonald would replace Speedee in the 1960s.) Also outside were plenty  of parking spots for customers to wait for their car-hop service (there was no inside seating). While waiting in their cars, customers could order from the very limited menu that included hamburgers for 15 cents, cheeseburgers for 19 cents, French fries for 10 cents, shakes for 20 cents, and all other drinks for just 10 cents. Inside the first McDonald’s a crew of workers, wearing dark slacks and a white shirt covered by an apron would prepare the food quickly. At the time, fries were made fresh from potatoes and Coca Cola and root beer were drawn directly from a barrel. The McDonalds Museum The original McDonald’s underwent a number of remodels over the years but in 1984 it was torn down. In its place, a nearly exact replica (they even used the original blueprints) was built in 1985 and turned into a museum. The museum is simple, perhaps too simple. It looks just like the original McDonald’s, even sporting mannequins pretending to work at their stations. However, if you want to actually eat McDonald’s food, you have to go across the street where a modern McDonald’s awaits your order. However, you may have more fun by visiting these eight amazing McDonalds restaurants. Important Dates in McDonald’s History 1958 – McDonald’s sells its 100 millionth hamburger 1961 – Hamburger University opens 1962 – The first McDonald’s with indoor seating (Denver, Colorado) 1965 – There are now over 700 McDonald’s restaurants 1966 – Ronald McDonald appears in his first TV commercial 1968 – The Big Mac is first offered 1971 – Ronald McDonald gets friends – Hamburglar, Grimace, Mayor McCheese 1975 – The first McDonald’s drive-thru opens 1979 – Happy Meals introduced 1984 – Ray Kroc dies at age 81