Attendance Daily Time Record focuses on the need to design a system that will automatically arrange the record and calculate the average attendance of each student. A well-conceived and implemented automated student record system can reduce the costs of handling the paperwork associated with record keeping. Manual attendance record system is not efficient and requires time to arrange record and to calculate the average attendance of each individual student. Automated Student Attendance Daily Time Record
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Chemistry 200 Exam 1 Review Problems 1. Calculate the number of atoms in 10.0 grams of Fe. 2. Give the mass number‚ #protons‚ #neutrons and #electrons for the isotope strontium-88. 3. Calculate the number of moles of carbon in 50.0 g of benzene C6H6 4. A substance is found to be 38.7 % C‚ 9.7 % H and 51.6 % O by mass. Its molar mass is 62.1 g/mole. What is its molecular formula? 5. Name the following: a) Ca(OH)2 b) KCN c) HClO4(aq) d) FeSO4 e) Na2O f) SF6 g)
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International Business Law Daily mail case Daily mail is a company created in 1896; it is a British newspaper for lower-middle class. It becomes the first British newspaper which sells a million copies a day. Nowadays‚ it provides content‚ information‚ analytics and events for both businesses and consumers. This British company decided in 1988 to transfer its seat to Netherlands. According to the freedom of movement in the European Union‚ they should be allowed to do it. The British court refused
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Chemistry 12 Unit 2 Notes - Equilibrium Chemistry 12 Tutorial 5 – The Equilibrium Constant (Keq) What is Keq ? The "K" in Keq stands for "Constant". The "eq" means that the reaction is at equilibrium. Very roughly‚ Keq tells you the ratio of Products/Reactants for a given reaction at equilibrium at a certain temperature. [Products] [Reactants] K eq = It’s not quite this simple when we deal with real substances. Let’s take an example. It has been found for the reaction: 2HI(g )
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personal activities. Like many U.S. Americans‚ my personal and professional activities relay heavily on the use of technology. From the alarm clock in the morning to the computer at work‚ technology plays a vital part of my everyday life. Technology enhances the ease and simplicity of activities and adds convenience to life. Although‚ when these technologies fail to operate correctly‚ they disrupt daily activities and hinder productivity. It is six in the morning and my cell phone rings. It is my alarm
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Mastering Chemistry Chapter 1 Notes: Mixtures‚ Solutions‚ Pure Chemical Substances‚ Compounds‚ and Elements Matter can be classified into several categories. All substances are either pure chemical substances or mixtures. Mixtures can be separated into their component parts through physical means‚ whereas pure chemical substances require chemical or nuclear reactions to separate them. Pure chemical substances can be further divided into elements or compounds. Mixtures can be either heterogeneous orhomogeneous
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Chemistry Revision F331 Isotopes - atoms with the same atomic number‚ but different mass numbers 131I - radioactive tracer for thyroid. 99Tc for tumours. Radioisotopes - gamma emitters & short half life - long enough to detect‚ but not long enough for damage. Beta particles emitters are more useful than alpha particle emitters because they penetrate more and so are more easily detected. Also‚ less damaging. The half life is the time taken for half the isotope to decay Mass left = initial
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CONCEPTS IN ORGANIC CHEMISTRY • Inductive Effect : Inductive effect is defined as permanent displacement of shared electron pair in a carbon chain towards more electronegative atom or group. Types of Inductive effect : 1.Negative Inductive Effect : (—I effect‚ Electron withdrawing effect) when an electronegative atom or group (more electro negative than hydrogen)is attached to the terminal of the carbon chain in a compound‚ the electrons are displaced in the direction of the attached
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1. “The energy for life comes from the sun.” Outline the role of the photosynthesis process to explain what is meant by this statement. (3 marks) chlorophyll 6CO2(g) + 6H2O(l) + energy C6 H12 O6 (aq) + 6O2(g) 2830 kJ glucose Photosynthesis is the process in which plants use the sun’s light energy to convert carbon dioxide and water into carbohydrates such as glucose‚ sucrose‚ starch and cellulose. Carbohydrates are high energy
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Recommended Daily Allowance How does the Food Guide Pyramid assist individuals wanting to plan a healthy daily menu? The food guide pyramid helps everyone plan a healthy daily menu by giving a set guideline of what types and how much of each food group to be consumed a day for a healthy diet. By following these guidelines the individual person can have a healthy diet rich in the nutrients he/she needs every day. Eating the proper amounts of the various food groups will help a person to control
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