Chemistry Internal Assessment 2011 Candy Au Introduction The reaction between zinc and copper (II) sulphate is endothermic. If an excess of zinc powder is added to a measured amount of aqueous copper (II) sulphate in a calorimeter and the temperature change is recorded over a period of time‚ the enthalpy change of the reaction can be experimentally determined. Assumption 1. Mass of H2O in 100cm3 of CuSO4 solution is 100g 2. Specific heat of solution is 4.18 kJ kg-1 K-1 which is the
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Chemistry Internal Assessment: Determining the Enthalpy Change of a Displacement Reaction AIM: To determine the enthalpy change for the reaction between copper(II) sulfate and zinc. BACKGROUND THEORY: Bond breaking is endothermic while bond forming is exothermic. The reaction between copper(ll) sulfate and zinc is exothermic as the energy required to form the bonds of the products is greater than the energy required to break the bonds of the reactants. In an exothermic reaction‚ heat is
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the most amount of copper after it is subjected to a sequence of reactions. The copper is originally in solid form‚ but the reactions will turn it into free Cu+2 ions floating in solution. The ions will then be regrouped to form solid copper once again. During this process‚ however‚ some of the Cu+2 ions may be lost. The copper will subjected to changes in pH and heat. These steps were responsible for the breakdown and reconstruction of the copper. The percent of copper retrieved will reflect
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solutions. The aqueous nitrates are copper (II) nitrate‚ lead (II) nitrate‚ zinc nitrate‚ magnesium nitrate‚ and silver nitrate. You can not manufacture the containers from glass due to possible breakage. Nor will plastic containers do because plastic tends to harden over time and also may shatter. This leaves metal. Unfortunately‚ many metals get eaten away (corrode)‚ when they come in contact with aqueous nitrates. Company documents indicate that copper‚ lead‚ zinc‚ and magnesium metals may work
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uses of brass‚ steel and solder and 2 other alloys of your choice‚ and explain how these uses relate to their properties. Brass: The two major metals in brass are copper and zinc. The proportion of the copper to zinc affects the colour of the alloy‚ ranging from a rose coloured alloy to a yellow alloy. The higher the proportion of zinc‚ the greater the hardness and tensile strength of the alloy. Brass can be highly polished and is lustrous which makes it useful for ornamental materials and musical
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95) + x(.5) = 10.7 g/ml x(.975) + 8.94(.025) = 7.0 .5x = 2.207 g/ml .975x = 6.77 x = 4.414 g/ml x = 6.95 g/ml Based off of the density calculation for the years 1995-1999 it is clear that the unknown metal that replaced most of the copper is zinc with a density of 7.14 g/ml. Human error is mostly to blame for the years 75-79 calculation. Summary The main goal of this experiment was to obtain the density of pennies throughout multiple decades and determine when the composition was changed
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experimental % of copper (Cu) in a post 1982 cent? In this lab‚ we will determine the % composition of a modern (post-1982) penny by using a strong acid called nitric acid (HNO3)‚ to react and dissolve the zinc core‚ leaving only the copper coating. Once only copper remains‚ we will then compare its’ absorbency to the other five post-1982 penny Cu concentrations made in this lab. INTRODUCTION: Before 1982 the US penny was made of pure copper. Because of the high cost of copper‚ the US government
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Barrier Protection ; In the method ‚ a barrier film is introduced between iron surface and atmospheric air. The film is obtained by painting‚varnishing etc. 2) Galvanization ; The metallic iron is covered by a layer of more reactive metal such as zinc. The active metal losses electrons in preference of iron. Thus‚ protecting from rusting and corrosion. Galvanized Metals Aim of the project; In this project the aim is to investigate effect of the metals coupling on the rusting of iron. Metal coupling
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section ii) Nickel section iii) Silver section Seven color section: Parts that are made with mild steel are taken in this shop. At first zinc coating is provided to the parts and then these parts are seven colored. There is a single room provided for this section. Parts are taken to the room after cleaning and then stored in the table. There are three zinc tanks inside the room although there is a tank for seven color it remains unused. It is done outside the room. Acid cleaning is also done outside
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This experiment aims to observe the different chemical changes copper undergoes in different conditions. II. METHODOLOGY 1. Precipitation of Copper (II) Hydroxide Materials used: 0.100 M Cu(NO3)2 solution‚ 250-mL beaker‚ 6.00
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