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.

Great Love Quotes That Will Evoke the Flame of Love

Great Love Quotes That Will Evoke the Flame of Love Great is what great does. Great love quotes are no exception to this rule. These love quotes have become great because they have infused and inspired the feelings of love in many a soul. A few of these great love quotes are sure to stir up love and romantic feelings in your heart too. Love is the strange bewilderment, which overtakes one person on account of another person. James Thurber and E. B. White The best and most beautiful things in this world cannot be seen or even heard, but must be felt with the heart. Helen Keller The most difficult thing to explain in life is the simplest truth called love. Ramanathan Srinivasan A dream you dream alone is only a dream. A dream you dream together is reality. John Lennon Its a very dangerous state. You are inclined to recklessness and kind of tune out the rest of your life and everything thats been important to you. Its actually not all that pleasurable. I dont know who the hell wants to get in a situation where you cant bear an hour without somebodys company. Colin Firth As we have explained, in first love the soul is taken long before the body; later the body is taken long before the soul; sometimes the soul is not taken at all. Victor Hugo As soon go kindle fire with snow, as seek to quench the fire of love with words. William Shakespeare Love cannot endure indifference. It needs to be wanted. Like a lamp, it needs to be fed out of the oil of anothers heart, or its flame burns low. Henry Ward Beecher Love is when you look into someones eyes and go all the way inside; to their soul and you both know... instantly! Angela Chase Find the person who will love you because of your differences and not in spite of them and you have found a lover for life. Leo Buscaglia With love one can live even without happiness. Fyodor Dostoyevsky Love is a better teacher than duty. Albert Einstein The prerequisite for making love is to like someone enormously. Helen Gurley Brown To love is nothing. To be loved is something. But to love and be loved, thats everything! T. Tolis True love stories never have endings. Richard Bach A woman knows the face of the man she loves as a sailor knows the open sea. Honore de Balzac In real love you want the other persons good. In romantic love you want the other person. Margaret Anderson Youll discover that real love is millions of miles past falling in love with anyone or anything. When you make that one effort to feel compassion instead of blame or self-blame, the heart opens again and continues opening. Sara Paddison Love is like war: easy to begin but very hard to stop. H. L. Mencken True love is when your heart and your minds are saying the same thing. Leanna L. Bartram I have found the paradox that if you love until it hurts, there can be no more hurt, only more love. Mother Teresa Truly loving another means letting go of all expectations. It means full acceptance, even celebration of anothers personhood. Karen Casey Love is a friendship set to music. Joseph Campbell Blessed is the season, which engages the whole world in a conspiracy of love. Hamilton Wright Mabie I think what motivates people is not great hate, but great love for other people. Huey Newton Life without love is like a tree without blossoms or fruit. Khalil Gibran Love takes off masks that we fear we cannot live without and know we cannot live within. James Baldwin Love is a gift, not an obligation, follow your heart and always trust the person you love. Anonymous Love does not begin and end the way we seem to think it does. Love is a battle, love is a war; love is a growing up. James A. Baldwin Honesty is the only way with anyone, when youll be so close as to be living inside each others skins. Lois McMaster Bujold Love is something eternal†¦ The aspect may change, but not the essence. Vincent Van Gogh Love is a smoke made with the fume of sighs. William Shakespeare Whats meant to be will always find a way. Trisha Yearwood To be able to say how much you love is to love but little. Petrarch The best proof of love is trust. Joyce Brothers Whoso loves, believes the impossible. Elizabeth Barret Browning

Communications Assignment Example | Topics and Well Written Essays - 250 words - 1

Communications - Assignment Example 228). Friend shifts are alterations, or changes that occur when one decides to change their friends. Usually, this occurs when one of the friends, changes their perception about the friendship (Ivy, 2011, p. 216). Self-disclosure is the act of telling your friend about yourself, your hidden secrets that define your personality (Ivy, 2011, p. 199). Friendship intimacy is the close relation that two friends share in a friendship (Ivy, 2011, p.220). Jocular sparring refers to unique way that men between themselves and it usually go wrong when used with women (Ivy, 2011, p. 230). Male-male friendships and female-female friendships differ in the content of their conversation. Female friends talk more often and their conversations main topics center on intimate topics, sex differences, personal and family matters. Men friends always talk less than their female counterparts where their conversations center on sports. The principal dissimilarity between the two types of friendships is based on the sex-stereotypical assumptions, which tend to favor men and not women. Female-female friendships are always intimate unlike male-male friendships. This implies that female friends disclose their intimate selves. This creates more liking and a cohesive bond between them (Ivy, 2011, p. 220). Male friends rarely disclose their intimate self and friendships are not that intimate and therefore do not develop strong bonds (Ivy, 2011, p. 220-221). Female-female friendships are characterized by voluntary relations between the friends. Another major characteristic is the emphasis on conversational and emotional expressiveness. These friendships are also characterized by talks of family and personal matters (Ivy, 2011, p.

How social class affect us who live in america Essay

How social class affect us who live in america - Essay Example The other classes work for the first class. This paper outlines the effects of social classes in various fields. Social class affects education. In America, the white race get favours when it comes to education. The whites are likely to pass their examinations compared to the other races, who are the minority. This is because the working classes, who are the whites, always do not expect much from their children (Leonhardt, 2005). The other minorities always have their hopes in their children, so that they help them in the future. This raises their expectations on the children’s results. The white children have everything, like financial support, and they are motivated to read more. Poverty has affected the way children study, because most of the times they will be out of school looking for fees. Social class affects the health care of society. There is a difference in health standards between classes, and this is not only because of the level of income. There is inequality in supply of health necessities depending on the social class of individuals (Scott, 2005). The high class lived long and fell sick less often, as compared to, the lower class. They have the necessary resources to acquire medication and access health-improving activities like sports and gym. The lower classes face hardships in life making them prone to diseases like hypertensions. They engage in healthy risky activities like abuse of drugs. Even if the low class gets employment, it will not improve their health because they will still live in areas of low standards. The social class affects how people relate to another. People socialize based on their level of classes. Most lower class men fear dating girls in the upper class (Lewin, 2012). The lower classes have low self-esteem because of their economic situation. They have stress, frustrations because of income inequality. The lower classes face many challenges, causing them to engage in criminal activities. They spend quality time away

Reservation Blues Essay -- essays research papers

Hartry 1 Alterations: Comparing the Changes Caused by Marriage of the two Bessie Head Short Stories, â€Å"Life† and â€Å"Snapshots of a Wedding† Marriage is the union of two people, traditionally husband and wife. Traditional also are the roles that women play when confined in a marriage. When a woman has had the opportunity to educate herself pass tradition and has been use to a fast-paced modern lifestyle, this role of the wife might prove to be quite onerous to mold to. Usually a time of joy, celebration, and adulation, marriage may also bring along emotional and physical pain as well as awkward situations, as the woman must alter herself to conform the traditional role of what a wife should be. Bessie Head depicts two modernized, educated women in her short stories of â€Å"Life† and â€Å"Snapshots of a Wedding†. These women are forced to change from the only lives they knew as single women to the new roles they must live up to as wives. Life Morapedi and Neo are both women, who compared to the people of their perspective villages, are highly educated and have transcended the traditional customs of their African villages. Even though they have acquired knowledge beyond others and are able to attain high paying jobs, in certain aspects they are seen as interruption of the normal tradition of the villages. The inhabitants of the villages see these two women as an impediment to the usual occurrences of the villages. Life Morapedi is a vivacious, cordial, fancy woman with an enchanting voice and a tall, well-built body. She brings the intelligence of a big city back to a rural city. Villagers expect her to â€Å"bring a little light† (Head 349) to the slow-moving rural life. She loves to live life, hence her name, and throws parties and spends her never-ending bank account to show this love that she has for life. Before she is married she also engages in the endeavors of sleeping with as many men as she can for business and pleasure, a habit brought back from the city. Neo is a woman who has also excelled in her studies, excelling pass many in her village as well, including her closest family members. Due to the fact that she is smarter than most, she wants everyone to know that she is smarter. Letting everyone know causes her to be labeled a snob. Unlike Life, whose amicable nature e nthralls outsiders towards her, Neo has egocentric qualities that cause the people of her... ...ng it is not something she wants to be. This stereotypic role will probably continue to occur unless the stereotype of what a wife should be takes on yet another change. Hopefully one day an educated, vivacious, well-spoken, working, woman will become the tradition of what a wife epitomizes. +Berg, Christine G. â€Å"Bemused by education: Bessie Head’s ‘Snapshots of a Wedding’.† Exploring Short Stories (1998): Web Luis Literature Resource Center Coleman library, 14 April 2004. Goldstein, Amy. â€Å"Many Wives Have Become Family Breadwinners.† Washington Post (2002) 29 February 2000 Head, Bessie. â€Å"Life.† Literature and the Writing Process. Ed. Elizabeth McMahn, et al. 6th ed. New Jersey: Prentice Hall, 2002. 349-355. Head, Bessie. â€Å"Snapshots of a Wedding.† Unwinding Threads: Writing by Women in Africa. Ed. Charlotte H. Bruner, et al. London: Heinmann Books, 1983. 157-161. Kerschen, Lois. â€Å"Critical Essay on ‘Life’.† Exploring Short Stories for Students 13 (2001): Web Luis Literature Resource Center Coleman library, 14 April 2004. March, Thomas, M. â€Å"Snapshots of a Wedding.† Short Stories for Students (1999) Web Luis Literature Resource Center Coleman library, 12 April 2004.

Fresh Food and Canned Food Essay

Eating is most important activity in our life. Some people eat 2 times, 4 times, or some people in poor countries eat only 1 time a day. We live in a world where the variety of food is immense, and we are responsible for what we eat. We decide what we are about to eat and how it will affect our bodies. The three main differences between fresh food and canned food are flavor, health benefits, and cost. The most notable difference between these two kinds of foods is their flavor. Fresh food have great flavor and taste because they keep all their natural conditions. Canned food however, lack a lot of its flavor characteristics because there are some other chemical products added to the natural foods. Fresh food will have a greater taste and flavor when consumed just because of the time in which they have been prepared. Comparing both types of foods there is another difference. There is a health factor that affects both of them. Canned foods lose some of the original fresh food nutrients and vitamins when stored, and also it has to be tinned with many conservatives and chemical factors that prolong the shelf life and apparent freshness of the food but could also become toxic if consumed too often. Yet another difference between these two types of foods is the cost. Canned food are much more expensive than fresh foods. The benefit of buying tinned foods is that they are easier to find, for example, in a supermarket instead of the market like the fresh foods. When you look at the picture of the canned food it is so beautiful and it makes you buy it, but when you open it later you will see that they do not match and the taste is not good. Canned food requires less work than fresh food, even sometimes no work at all. If you decide to make food instead buying it ready you would have to spend at least 2 or 3 hours, but you will get delicious food that everyone will enjoy it. Fresh foods are always good for your health, but if you do not have enough time it is fine to get canned food. Eating canned food is not recommended, because it can make you sick and you might get diseases from that.

Essay about The Growing Problem of Child Homelessness in...

It is something that a lot of us are used to seeing on a regular basis standing at the end of an off ramp holding a sign say â€Å"homeless and hungry.† You will see them wondering the streets digging through trash in search for something to eat. We see them everywhere and our initial reaction when we see them is to ignore them and not look at them. You especially avoid making eye contact with them and automatically label them as someone who is too lazy to go get a job or is a drug or alcohol addict and that they would much rather live on the streets. Homelessness is a continuing growing problem, with more and more not just adults but children forced to live on the streets. Homeless people are humans just like us. Being homeless, you†¦show more content†¦In 2008 the U.S. Census Bureau showed that 13.2 % where living below that poverty level (Bureau, 2010). January 2009 The Annual Homeless Assessment Report did a count in more than 1,000 cities, and found that there were 643,000 American that where in fact homeless (Sullivan, 2010). Being homeless can be the least or one of the least desirable circumstances one could imagine, causing great difficulties to one more than one could imagine. People usually become homeless as results from a combined of different effects from of extreme poverty, the lack, and limited affordable housing and the decline of government supports, lack of employment opportunities, poor healthcare, and limited health services for mental illness, domestic violence, foreclosures, and evictions (Wikipedia, 2009, p. 6). These are just some of the major reasons that cause people to become homeless. But not all homeless are without jobs. There is a small percent of them do work, but the minimum wage is simply not enough to cover their rent since they are already struggling living paycheck to paycheck or the work is not steady. Forcing more and more not only single people but also entire families. The result of being homeless can result in loss of your possessions, privacy along with your security just to name a few. You have to reestablish your entire life and adjust to the vulnerability of trauma such as physical and sexual assault,Show MoreRelatedEssay about Homeless Children In America1111 Words   |  5 PagesHomeless Children in America   Ã‚  Ã‚  Ã‚  Ã‚  To be homeless is to not have a home or a permanent place of residence. Nationwide, there is estimated to be 3.5 million people that are homeless, and roughly 1.35 million of them are children. It is shown that homeless rates, which are the number of sheltered beds in a city divided by the cities population, have tripled since the 1980’s (National Coalition for Homeless, 2014). Worldwide, it is estimated that 100 million children live and work on the streets.Read MoreChild Hunger in the USA Essay1445 Words   |  6 Pagesparticularly devastating for children even short-term episodes of hunger can cause lasting damage.(â€Å"Child Nutrition Programs) Child hunger in the United States is caused by poverty, unemployment, food insecurity, and food shortage; however there are many solutions to this problem like FRAC strategies, food banks, summer feeding programs, and backpack feeding programs. Poverty is one of the main causes of child hunger. Most people that live in poverty cant afford to buy food. All the money they haveRead MoreEssay on Homelessness1569 Words   |  7 PagesHomelessness is a serious problem in our society. 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