Chemistry revision Atoms elements and compounds Atom-the smallest part of an element that can still be recognized as an element Element-a substance made up of only one type of atom. An element cannot be broken down chemically into any simpler substance Nucleus-middle of the atom‚ which contains protons and neutrons Electron-tiny particle‚ which surrounds the nucleus with a negative charge Compound-when two elements react and combine together which contain more than one element. There
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Exam-style Questions For Studies Exam 1. (a) Express f (x) = x2 – 6x + 14 in the form f (x) = (x – h)2 + k‚ where h and k are to be determined. (b) Hence‚ or otherwise‚ write down the coordinates of the vertex of the parabola with equation y – x2 – 6x + 14. (Total 4 marks) 2. The diagram shows the graph of the function y = ax2 + bx + c. Complete the table below to show whether each expression is positive‚ negative or zero. Expression|positive|negative|zero| a|||| c|||| b2 – 4ac|||| b||||
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Lab Report Electrical Conductivity Introduction There are some substances that are capable of conducting electricity‚ and the reason they conduct electricity is because of the type of compound the substance is. Electrolytes or any ionic compound conduct electricity and nonelectrolytes do not conduct electricity. An Ionic compound is formed from the electrical attraction between anions and cations‚ typically a metal with a non-metal‚ except hydrogen. When an ionic compound forms‚ the anion
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Data Table: Qualitative Cation Tests Name Test Tube 1: HClNH3 Test Tube 2: NaOHExcess Aluminum 3+ No precipitate Slightly milky Dissolves Ammonium + No Precipitate No precipitate Calcium 2+ No Precipitate Milky white precipitate Precipitate does not dissolve Copper 2+ No precipitate Became much darker blue and milky Iron 3+ Brighter yellow Orange precipitate that then dissolves Lead 2+ Milky white precipitate Precipitate gets more milky Silver + Milky white precipitate Precipitate gets
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The notion of the atom all stared about 450 BC when a Greek scholar starting think when can something break on more‚ when are the pieces at their smallest‚ this mans name was Leucippus. Leucippus also had pupil who also thought the same way as Leucippus‚ his name was Democritus. They developed there ideas and when Democritus died his theory summed up briefly was that everything in the world was made of tiny pieced that could not be broken up any more. That how the word atom was derived from the Greek
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In the past benzene was obtained from the distillation of coal in the absence of air. Today most benzene is made syntheticallyfrom petroleum products. The benzene is a closed ring of six atoms connected by bonds that resonatebetween single and double bonds; each carbon is also bound to a single atom. Benzene isinsoluble in water but mixes in all proportions with organic . Benzene is itself an excellentsolvent for certain and for most simple organic chemicals. It is one of the most commonly
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A college education has lost its value. When students attend college‚ they are left in severe debt after they graduate. This can sometimes be discouraging to students. This also makes you wonder‚ “What is the value of going to college or attending a postsecondary institution?” Has going to college become more expensive than what it’s worth? In my role as a financial aid counselor‚ I have gained much insight regarding tuition costs as well as financial aid amounts and options. In my years of being
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Graffiti has been an issue that generates concern to the modern society throughout the world and originating a controversy of it being classified as a legitimate art form or vandalism. For the purpose of discussing this issue‚ it is essential to understand the terms of graffiti‚ art and vandalism. Graffiti can be described as the act of marking by the use of spray-paints‚ markers or other tools on a surface‚ usually a visible spot‚ with the intention to attract attention from the general community
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segregation upon each other. Religion should be a positive action throughout all cultures‚ perceived as uniting‚ motivating and compassionate‚ yet it can’t be as religion is divided into two sides‚ the negative side overpowering the positive side‚ through discrimination‚ inequality and generalisation. Religion has mostly a negative influence towards our society due to the fact that something majorly negative needs to occur for something positive to happen. This is evident in the way in which African
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Atoms make up everything around us‚ including ourselves. They consist of protons which give off a positive charge‚ electrons which give off a negative charge and neutrons which have no charge. In an atom there are the same amount of protons as there are electrons. If there weren’t it would cause the atom to behave differently. Atoms have layers around them called shells which contain electrons. Each shell can only hold a certain amount of electrons. Molecules can be multiple atoms of the same element
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