Interpreting The Periodic Table At The Middle Of The Nineteenth Century

The year that the composition of the pennies changed started after 1982, it wasn’t until 1983 did the pennies composition fully changed. Before 1982, the U.S. mint companies made the pennies with a metallic composition of 95% copper and 5% zinc. Sometime in 1982 the U.S. mint companies started to change the metallic compositions of the pennies to 97.5% zinc and 2.5% copper. It wasn’t until 1983 did the metallic compositions of the pennies fully changeover to 97.5% zinc and 2.5% copper (United, 1). The United States Mint source confirmed our experimental conclusion that the pennies composition changed around 1982 to 1983, when we measured the light and heavy pennies, the pennies after 1984 weighed an average of 2.5089 grams. But the pennies

In 1909, on the 100th anniversary of Abraham Lincoln’s birth, the one cent coin (penny) was introduced. Between 1864 and 1982, the penny was made of 95% copper and 5% zinc and tin. In the 1980s the cost of producing the penny grew to be higher than its face value so, in 1982 the composition of the penny was altered to have a core of zinc metal with a thin copper shell. The percentage of copper now allowed in the penny by Congress is 2.5% by mass.

Aristotle says that friendship is a virtue that is the “most necessary with a view to living … for without friends no one would choose to live, though he had all other goods.” (Aristotle, 127). Through his writing in The Periodic Table, Primo Levi shows that friendship gives people hope and the will to survive. Enrico first appears in the chapter “Hydrogen”, when him and Levi manage to find their way into a lab which belongs to Enrico’s brother. Enrico is an embodiment of Levis hope to become a chemist. Levi says that him and Enrico “[will] be chemists” (Levi, 23). Levi believes that him and Enrico will “dredge the bowels of the mystery with [their] strength, [their] talent,” and that they would “grab Proteus by the throat, cut short his inconclusive

The penny, also known simply as the one-cent coin, was first made about 230 years ago in 1787. The first penny ever made was 100% copper and it was heavier and larger than the usual penny today. The design itself was suggested by the famous Benjamin Franklin ("A Brief History of the U.S. Cent”). Lately, people have talked about the idea of abolishing the penny, but others disagree. The penny should not be abolished.

Plautus once said “You have to spend money to make money,” a quote made painfully true by the penny, a coin worth 1/100th of a dollar. The penny’s story starts in 1792 with the first U.S. Mint which produced the dime, quarter, nickel, penny and half penny which we will get back to later. Pennies were originally made of 100% copper, however, as prices of copper rose they soon started to make pennies out of 95% zinc and 3% copper, which is how they are made today. Soon after this, the raw material of pennies began to cost more than the penny itself was worth, therefore people began to melt them down and sell the material for profit. When this occurred, instead of the government getting rid of the pennies all together and being happy citizens where removing them from circulation they made melting the currency down illegal and continued producing 4 billion pennies a year! You can find these tiny useless coins anywhere from in your couch cushion to on the sidewalk. The reason we should stop minting pennies is that they cost money, waste time, are bad for the environment, and they are useless.

In this lab, we will determine the percent composition of a modern (post-1982) penny by using a strong acid to react and dissolve the zinc core, leaving only the copper coating. Once only copper remains, we will compare its mass to the entire mass of the penny to determine how much of a penny is copper and how much is zinc.

A second reason this should happen is that it is bad for the environment. Creating the penny releases C02 into the air. For example the article Should we get rid of the Penny 8 Reasons to Keep it vs Eliminate it says,”Design Life-Cycle.org a sight created by students at the University of California, calculates that just transporting pennies to banks-not even counting any other stage of production-puts about 1.5 million metric tons of carbon dioxide (C02) into the atmosphere each year. The penny also contains toxic metals. For example the article Should we get rid of the Penny 8 Reasons to Keep it vs Eliminate it says,”Along with the Zinc the ores usually contain other metals, including toxic metals like Cadmium and Lead. Along with toxic metals the penny uses a surprising amount of metal. The surface metal is only 2.5% of the penny’s entire metal composition. The penny should go away, because of how environmentally unfriendly it

A penny is 97.5% zinc and 2.5% copper, at last estimates costing 1.7 cents to produce. This means that the U.S. Mint in 2014 lost over $50 million minting pennies! This difference in what it costs to produce a coin and

After the process of weighing and finding volumes of both sets of pennies, the density of both sets were resolved. The density of the pennies minted before 1982 was found to be 9.9 g/cm³. The density of the pennies minted after 1983 was 6.5 g/cm³. This displays that the pennies minted before 1982 were overall more dense than the pennies minted after 1983. Conveying that the metals made in the pennies are different. It is known that the density of copper is 8.92 g/cm³. The percent error between the density of copper and the density of the pennies minted pre 1982 was found to be 11%. From this, it is safe to reason that the pennies minted before 1982 were mostly made of copper (Headley, The Spruce). The percent error between the density of copper and the density of the pennies minted after 1983 was found to be 27%. From this percentage it is depicted that this

What is the atomic structure you may ask? Well, it’s the law stating the structure of an atom. It is composed of a positively charged nucleus containing a certain amount of protons (positive), neutrons (neutral charge), and electrons (negative). The amount of each subatomic particle (proton, neutron, and electron) all depend on what the element is. Now although this statement may seem fairly simple it was most definitely not. People have been studying the atomic structure for more than 300+ years and are still studying it. So after reading this you may wonder who even made this atomic structure up. After hundreds of years of research there is not any one individual who made the structure up but roughly

The book “The Periodic Table” by Primo Levi is undoubtedly a masterpiece. It showcases the enthusiasm, the level of dedication, and passion successful chemists such as Primo Levi himself had for the field of their expertise. The way Primo Levi has related the troublesome times and events he had to face in prospect with the elements of the periodic table is laudable. Primo Levi is surely an inspiration and a perfect example of prodigy and passion. Despite the challenges and the hardships inflicted on him by the bigoted group of Germens, he still managed to emerge as an exceptional chemist and an author who made great contributions to the modern chemistry as we now know it.

find a variety of items in one store, and often at a lower price. However, the key

Zinc is not just used for batteries, pennies and brass shell casings. It is also used for medicine. Interestingly it is known as an “essential trace element” for the small amounts of it necessary for human health. It was discovered by Andreas Marggraf in 1746 in Germany, after two other men (William Champion and Anton von Swab) a couple years earlier. Andreas Marggraf though, was credited for the isolation of Zinc after establishing a detailed theory for it. A reason I chose the picture of the pennies is because they are thought to be made of copper, but these days it is about 97.5% zinc inside. The brass shell casings are interesting for the reason that the brass is an alloy of copper and zinc, showing another variety of objects made of zinc.

When comparing the 1970s penny and the 2010s penny, one discovers that the 1970s penny has more copper in it because the 1970s penny is denser than the 2010s penny. Although the measurements of the pennies were very close, there were several factors that may have caused them to be incorrect such as the caliper not clamping completely, the engravings on both sides of the pennies,

An Atom is the the basic building block of all matter. Atoms are made up of Particles, called: Protons, neutrons and Electrons. Protons carry a positive charge, the neutron carry 's a neutral charge and the electron carry’s a negative charge. The Atom has two main parts the Nucleus and the Electron Shell. The Nucleus contains the Protons and Neutrons. The electron Shell Contains the The electrons.