Chapter 1 The Problem-And It’s Background Potato as an alternative battery for scientific calculator is the chosen topic of the researchers. The researchers thought of many topics but the topic about the scientific calculator get their attention. They thought that scientific calculator is very useful to students especially to 4th year students. A scientific calculator is a type of electronic calculator‚ designed to calculate problems in science‚ engineering‚ and mathematics. They have
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Discussion The reactivity series is a list of metals arranged in order of their reactivity based on displacement reactions‚ reduction of their oxides by hydrogen or carbon‚ the relative ease of decomposition of their compounds and reactions with oxygen‚ dilute acids and water. The higher up a metal is in the reactivity series‚ the more reactive it is. In the experiment conducted‚ the three metals‚ magnesium‚ zinc and copper each had to undergo displacement reactions and reactions with water‚ oxygen
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the solvent via hydrogen bonding‚ electrostatic forces‚ ion dipole forces‚ dipole-dipole forces and London forces. All of these can help a polar solute dissolve in an aqueous solvent. Polar molecules can be involved in these interactions because they have a partial charge. This partial charge is brought upon by the differences in electronegativity between the atoms in the molecule. The difference in electronegativity created a dipole in the molecule. The partially positive hydrogen atoms in H2O molecules
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an isomer‚ differs from (1^H) in that: 3^H has 2 more neutrons than 1^H Nitrogen has 7 electrons and thus can form a maximum of ___ covalent bonds with other elements 3 Carbon has 6 electrons while hydrogen has 1 electron. How many covalent bonds can form between a carbon atom and hydrogen atoms 4 In the lab you are culturing human cells in order for the cells to survive they must be cultured in a solution containing 25 mM glucose. You must make 500 ml of this solution. First‚ calculate
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A salt with this anion is sometimes called an acid oxalate‚ monobasic oxalate‚ or hydrogen oxalate. The equilibrium constant (Ka) for loss of the first proton is 5.37×10−2 (pKa = 1.27). The loss of the second proton‚ which yields the oxalate ion has an equilibrium constant of 5.25×10−5 (pKa = 4.28). These values imply that‚ in solutions with neutral pH‚ there is no oxalic acid‚ and only trace amounts of hydrogen oxalate.[1] The literature is often unclear on the distinction between H2C2O4‚ HC2O4-
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▪ Carbon- carbon multiple bonds ▪ Single bonds between a carbon atom and a more electronegative atom. ▪ Carbon atom double bonded to an oxygen atom Hydrocarbons • Hydrocarbons are organic compounds that contain only carbon and hydrogen atoms. • There are 3 types of aliphatic hydrocarbons: o Alkanes ▪ A hydrocarbon with only single bonds between carbon atoms. ▪ General formula is Cn H2n+2 ▪ All alkanes have the ending –“ane” ▪ Any alkyl branches in
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into the ground‚ it meets with the limestone. Limestone is mostly made up of the mineral calcium carbonate (CaCO3)‚ which is not very soluble‚ so the rocks don’t dissolve very quickly. But‚ if you add an acid‚ you add hydrogen ions (H+)‚ which will react with the carbonate to form hydrogen carbonate (HCO3- ions)‚ which are extremely soluble in water‚ therefore the limestone will start to dissolve. In the USA‚ sinkholes tend to occur in Florida‚ Texas‚ Alabama‚ Missouri‚ Kentucky‚ Tennessee‚ and Pennsylvania
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of water is its high heat capacity. Heat capacity is the degree which a substance changes temperature in response to a gain or loss of heat. This means that water is able to take in a lot of heat before changing its temperature. This is caused by hydrogen
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Writing Complete Equations Practice For each of the following problems‚ write complete chemical equations to describe the chemical process taking place. Important note: There are a few physical processes on this sheet – You can’t write an equation for a physical process! 1) When lithium hydroxide pellets are added to a solution of sulfuric acid (dihydrogen sulfate)‚ lithium sulfate and water are formed. 2) When dirty water is boiled for purification purposes‚ the temperature is brought up to
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Mark Scheme (Results) Summer 2012 International GCSE Chemistry (4CH0) Paper 1C Science Double Award (4SC0) Paper 1C Edexcel Level 1/Level 2 Certificate Chemistry (KCH0) Paper 1C Science (Double Award) (KSC0) Paper 1C Edexcel and BTEC Qualifications Edexcel and BTEC qualifications come from Pearson‚ the world’s leading learning company. We provide a wide range of qualifications including academic‚ vocational‚ occupational and specific programmes for employers. For further information‚
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