Smoking Effects essays

Smoking Effects essays There are multiple repercussions from choosing to smoke a tobacco substance. One major repercussion is the formation of lung cancer, an uncontrollable spread of irregular cells throughout the body. This disease is now the most common form of cancer diagnosed in the United States and a major cause of death as it accounts for 14% of all cancers and 28% of all cancer death (American Lung Association of Hudson Valley, www.alahv.org/bookfiles4/lung_cancer.html). Out of these deaths, cigarette smoking is responsible for an estimated 87% of lung cancer deaths (American Lung Association of Hudson Valley, www.alahv.org/bookfiles4/lung_cancer.html). Lung cancer produces a large quantity of pain, coughing, difficulty breathing, and many more symptoms that slow down the body. There is no good whatsoever involved with smoking of any kind, which is evident in the side affects and ending results. In addition to lung cancer, cardiovascular diseases, emphysema, and many other internal organ corruptions, smoking will simply cause real life to stop. Smokers generally do not go out much or do cardiovascular activities because their system cannot handle it. Their body becomes tired quickly and the individual must slow down. It becomes harder for the smoker to breathe when he or she participates in vigorous activities because the lungs are so corrupt and warn out. Smoking also causes tar to stick to the inside of the lungs making it harder to breathe. Appearance is affected by teeth and finger nails turning yellow. A typical smoker will also suffer from bad breath and will have a smoke smell on their clothing and belongings as well. Later stages of smoking include symptoms such as coughing, illness, due to a weaker immune system, and possible asthma. ...

Difference Between Atomic Weight and Atomic Mass

Difference Between Atomic Weight and Atomic Mass Atomic weight and atomic mass are two important concepts in chemistry and physics. Many people use the terms interchangeably, but they dont actually mean the same thing. Take a look at the difference between atomic weight and atomic mass and understand why most people are confused or dont care about the distinction. (If youre taking a chemistry class, it could show up on a test, so pay attention!) Atomic Mass Versus Atomic Weight Uranium has two primordial isotopes (uranium-238 and uranium-235). Uranium-238 has 92 protons plus 146 neutrons and uranium-235 92 protons and 143 neutrons. Â  Pallava Bagla/Getty Images Atomic mass (ma) is the mass of an atom. A single atom has a set number of protons and neutrons, so the mass is unequivocal (wont change) and is the sum of the number of protons and neutrons in the atom. Electrons contribute so little mass that they arent counted. Atomic weight is a weighted average of the mass of all the atoms of an element, based on the abundance of isotopes. The atomic weight can change because it depends on our understanding of how much of each isotope of an element exists. Both atomic mass and atomic weight rely on the atomic mass unit (amu), which is 1/12th the mass of an atom of carbon-12 in its ​ground state. Can Atomic Mass and Atomic Weight Ever Be the Same? If you find an element that exists as only one isotope, then the atomic mass and the atomic weight will be the same. Atomic mass and atomic weight may equal each other whenever you are working with a single isotope of an element, too. In this case, you use the atomic mass in calculations rather than the atomic weight of the element from the periodic table. Weight Versus Mass: Atoms and More Mass is a measure of the quantity of a substance, while weight is a measure of how a mass acts in a gravitational field. On Earth, where we are exposed to a fairly constant acceleration due to gravity, we dont pay much attention to the difference between the terms. After all, our definitions of mass were pretty much made with Earth gravity in mind, so if you say a weight has a mass of 1 kilogram and a 1 weight of 1 kilogram, youre right. Now, if you take that 1 kg mass to the Moon, its weight will be less. So, when the term atomic weight was coined back in 1808, isotopes were unknown and Earth gravity was the norm. The difference between atomic weight and atomic mass became known when F.W. Aston, the inventor of the mass spectrometer (1927) used his new device to study neon. At that time, the atomic weight of neon was believed to be 20.2 amu, yet Aston observed two peaks in the mass spectrum of neon, at relative masses 20.0 amu and 22.0 amu. Aston suggested there two actually two types of neon atoms in his sample: 90% of the atoms having a mass of 20 amu and 10% with a mass of 22 amu. This ratio gave a weighted average mass of 20.2 amu. He called the different forms of the neon atoms isotopes. Frederick Soddy had proposed the term isotopes in 1911 to describe atoms that occupy the same position in the periodic table, yet are different. Even though atomic weight is not a good description, the phrase has stuck around for historical reasons. The correct term today is relative atomic mass - the only weight part of the atomic weight is that it is based on a weighted average of isotope abundance.