Chemistry Atom and High Melting Essay

Chemistry Atom and High Melting Essay Chemistry: Atom and High Melting Essay Gladen T Maswera Chemistry Unit 1: Introduction to Chemistry Section A 1.1a) Gases don’t have fixed shapes because gas particles have little or no attraction to each other, hence they spread everywhere. The particles in a gas are very far apart and the forces between such widely spread particles are extremely weak. This means that gas particles will readily move away from each other. Their particles are not densely compacted. Whereas solids have a fixed shape because the atoms in them are bonded tightly together and there is little space between them. 1.1b) Solids, liquids and gases would not exist at such extreme temperatures because at a very high temperature higher than the maximum boiling point or melting point of either gas solid or liquid will cause a definite change of state, and thus they would not exist in their original form. The solid would melt, the liquid evaporate and the gas turns into plasma. 1.1c An atom is the basic unit of an element. An atom is a form of matter which may not be further broken down using any chemical means. A typical atom consists of protons neutrons and elements. A compound is the result of two or more elements becoming chemically combined together. The elements react chemically causing bonds to be formed between the atoms involved. An element is the simplest form of matter and cannot be decomposed into simpler substances. They are composed of one kind of atom each atom has the same properties and the same atomic number. Molecules are a result of two or more atoms being joined together chemically by a bond. 1.2(i) R would be suitable for filling a thermometer that records temperatures in Britain. (ii) P would be a liquid at room temperature because water boils at 100ââ€" ¦c and freeze at 0ââ€" ¦c and substance P is the one who’s temperatures are within this range. (iii) S and Q are most likely to be strong metals because of the very high melting and boiling points. (iv) Both Q and S would most likely to be ionically bonded because of the extremely high boiling and melting point. Ionic bonds have very high melting and boiling points because they are tighly bonded together. (v) Q and S would be solids at room temperature because of the high boiling and melting points. Solids have high melting and boiling points because the particles in them are highly compacted and are tightly bonded together. 1.3 Aim: To separate and compare a mixture of dyes in three differently coloured inks. Apparatus: Beaker, lid, chromatography paper, solvent, different colour dyes. Method: Pour a small amount of solvent such as ethanol into the beaker. Spot the chromatography paper with the three different colour dyes, about 1.0cm from the base of the paper. Suspend the paper into the beaker, making sure the level of the solvent is lower than that of the dye spots. Also make sure the paper doesn’t slide into the dye. Note the movement of the dye and separation of colours. Conclusion: Separated dyes. 2.1 Chlorine 35 Chlorine 37 2.2 The element Krypton is the one that cannot form a compound, because it has a full outer shell, therefore it does not need to give, take or share electrons. 2.3(a) Isotopes are atoms of the same element that have the same number of protons but different number of neutrons. 2.3(b) The average atomic mass = (64+65+68)à ·3=65.6 3.1(a) Nitrogen (N2) (b) We draw the electrons as dots and crosses to easily represent and differentiate between two valences of two or more elements. Substance under test Effects of gentle heat Soluble in water Solubility in Cyclohexane Conduction on solids Zinc Chloride Melts Yes No No Potassium Iodine Melts Dissolved No No Carbon Graphite Changed colour to red Mixed No Yes Glucose (C6 H12O6) Melted Dissolved No No Copper (Cu) Turned red No No Yes Lead (Pb) Melted & turned red No No Yes Silicon Dioxide (Si02) No change No No No We concluded that ionic bonds conduct electricity and have high melting and

Free Essays on Sex Pre-Selection

Danae Williams Sociology Mondays and Wednesdays Research Paper I approached this paper in a much different way then any other paper I have ever written. The topic that I have chosen is sex selection and since this topic is so new I felt that every resource was very unique and had a lot to offer. That is why I have chosen to write this paper in order of the resources I have found. I hope that you do not mind. Technology nowadays is phenomenal. There is so much that technology is now able to do, and there is also a lot of competition out there concerning technology. With the technology today there truly is no limit to what someone can do. Technology has become so advanced that couples can now even decide what sex they want their child to be. Sex selection is an unbelievably expensive and quite silly process. I would think that as long as a couple has a healthy baby that they would be happy, but not any more. Couples want it all and now they are capable of doing just that. Sex selection has always been around but not the way it is today. Accurately selecting the sex of ones child has been a goal of many cultures since man has been on earth. Some superstition has created many outrageous practices for the reproduction of a child of a desired sex at the time of conception. Recommendations for having males include, having sex in dry weather when the moon is full, the nut harvest is plentiful, and there is a north wind. Many parents throughout history have resorted to selective abortion and infanticide, to guarantee them the sex of their children. With more recent advances in technology couple have more assistance with an accurate method of selecting the sex of their child before conception. At this time there are two methods that provide the best results for sex selection, they are pre-implantation genetic diagnosis (PGD) of embryos and sperm-sorting through flow cytometry. The ethical ... Free Essays on Sex Pre-Selection Free Essays on Sex Pre-Selection Danae Williams Sociology Mondays and Wednesdays Research Paper I approached this paper in a much different way then any other paper I have ever written. The topic that I have chosen is sex selection and since this topic is so new I felt that every resource was very unique and had a lot to offer. That is why I have chosen to write this paper in order of the resources I have found. I hope that you do not mind. Technology nowadays is phenomenal. There is so much that technology is now able to do, and there is also a lot of competition out there concerning technology. With the technology today there truly is no limit to what someone can do. Technology has become so advanced that couples can now even decide what sex they want their child to be. Sex selection is an unbelievably expensive and quite silly process. I would think that as long as a couple has a healthy baby that they would be happy, but not any more. Couples want it all and now they are capable of doing just that. Sex selection has always been around but not the way it is today. Accurately selecting the sex of ones child has been a goal of many cultures since man has been on earth. Some superstition has created many outrageous practices for the reproduction of a child of a desired sex at the time of conception. Recommendations for having males include, having sex in dry weather when the moon is full, the nut harvest is plentiful, and there is a north wind. Many parents throughout history have resorted to selective abortion and infanticide, to guarantee them the sex of their children. With more recent advances in technology couple have more assistance with an accurate method of selecting the sex of their child before conception. At this time there are two methods that provide the best results for sex selection, they are pre-implantation genetic diagnosis (PGD) of embryos and sperm-sorting through flow cytometry. The ethical ...

Making an Interpretation Essay Example | Topics and Well Written Essays - 1000 words

Making an Interpretation - Essay Example In short, his will dominated his deeds. So he concluded that it was not as easy as he thought, and only the will was not enough to become fully virtuous, and the bad habits must be overcome and the good ones should be adapted to become what he called a Perfect man. Thus, he started reading different books, to become a complete perfectionist, and after thorough reading of such books, he was confused once again, for every author had different suggestions and ideas for the same virtues. If one deed was good for one author, the same was thought not to be a good one for another. For example about sincerity, one of the authors wrote that no one should be hurt, and you must be kind and sincere to everyone, on another hand another author writing about the same deed said that being more sincere can make other people selfish for you. You can remain quite far behind in the race of life by being extra sincere to everybody, which was also true according to my thought. So he decided that instead o f sticking his head in so many things all together, he is going to take a start by making a list of only a few virtues, which were vital to become perfect. So he made a list of thirteen virtues, which were going to help him achieve his goal. The virtues included ‘Temperance’ for not eating or drinking too much, for eating or drinking more than the appetite inclines us towards laziness and dullness. ‘Silence’ for speaking only when it is needed and avoiding frivolous conversation. ‘Ordering your things’ and managing yourself and your time is one of the most important virtues of life. Each thing should be given its time and everything should be placed where it is supposed to be. ‘Resolve’ your problems instead of making them more complicated. ‘Frugality’ is to spend only on good things and not to waste your money. By ‘industry’ he means not to waste time. Always keep yourself indulged in doing something good and creative. Be ‘sincere’ to everyone. You need to be patient, innocent and just. ‘Justice’ is to be just to everyone and not using your authorities for wrong. ’Moderation’ have to be followed everywhere. You have to be moderate while taking decisions. Don’t think at extreme levels. ‘Cleanliness’, must never be tolerated in your clothes, body and living place. You must always practice hygiene. ‘Tranquility’ should be there in your heart. You need not to go hyper and panic at some accidental situations. ‘Chastity’ should be used rarely, only for health purposes or for reproduction. It should not be used to an extent of disturbing your own peace or of someone else’s. ‘Humility’ should also be observed very carefully, which gives us spiritual peace. Now after listing down all these things, he decided that he is not going to make the same mistake again by adapting all of them at o nce instead he decided to adapt them one by one. For when he gets swayed to one, he will add another. This will be easier to adapt them all and the adaption of one might also help to adapt another one. Now he started adapting them one by one according to his self-prescribed sequence,