Give example with equation. 14What are oxidation and reduction reaction? 15. Why do gold and platinum not corrode in moist air? Short Answers 1. Write balanced chemical equation for. a. Zinc metal reacts with aqueous solution of hydrochloric acid to form zinc chloride solution and hydrogen gas. b. Solid mercury (II) oxide is heated‚ liquid mercury and oxygen gas is produced. c. Aqueous solution of sulphuric acid and sodium hydroxide react to form aqueous sodium
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Scandium is the 21st element on the periodic table. This element can be located in the 4th period 3rd . The symbol for Scandium is Sc on the periodic table. Scandium is used for and is in many things. For example it is used to help grow crops such as corn‚ peas‚ and other seed grown plants. There are many protons and neutrons in Scandium. There are 21 protons‚ 24 neutrons‚ and 21 electrons. Scandium is also used in tracking devices. Scandium was discovered in Sweden 1879‚ by Lars Fredrick Nilson
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Equations: 1) Cu + 4H+(aq) + 2NO3-(aq) Cu2+ + 2NO2 + 2H2O 2) Cu2+(aq) + 2-OH(aq) Cu(OH)2 3) Cu(OH)2 + heat CuO + H2O 4) CuO + H2SO4 Cu2+(aq) + SO42-(aq) + H2O 5) Cu2+(aq) + Zn Cu + Zn2+(aq) Stage 1- Dissolution of Copper Mass of vial & copper = 3.537g Mass of vial = 2.505g Mass of Copper = 1.032g Moles of copper = mass (g) ÷ (63.5g/mol) = 0.0162 mol (3s.f) Copper description: Initially‚ the copper was a solid that was
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Presentation Pressure Die Casting Sam Mande Deepak Ch Veera Pratap Vamsi raj J (BUB0912011) (BUB0912016) (BUB0912013) (BUB0912010) M. Sc. (Engg.) in Engineering Manufacturing and Management Module Leader : Dr N S Mahesh M. S. Ramaiah School of Advanced Studies 1 History Casting since about 4000 BC… Ancient Greece; bronze statue casting 450BC Iron works in early Europe‚ e.g. cast iron cannons from England 1543 2 M. S. Ramaiah School of Advanced Studies Introduction
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Cements Acid-base rxn cements Resin-based cements Phosphoric acid Organometallic chelate Polyalkenoic compound acid Zinc phosphate ZOE Polycarboxylate Glass ionomer compomer Silicate conventional composite Zinc silicophosphate resin-modified Cement | Composition | Setting rxn | Properties | Uses | Adv | Disadv | Zinc phosphate(ZP) | Powder: ZnOLiq: Phosphoric acid | 3Zn + 2H3PO4 Zn3(PO4)2 + H2O-s/f of ZnO dissolved by acid to give insoluble phosphate-set
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nitrate‚ KNO3 nitric acid‚ HNO3 trisodium phosphate‚ Na3PO4 sodium thiocyanate‚ NaSCN sulfuric acid‚ H2SO4 distilled water‚ dH2O B. Apparatus test tubes iron ring 250-mL beaker iron stand bunsen burner C. Others iron nails copper strip sand paper zinc strip pliers 2 III. Procedure A. Reactions of Iron with various Aqueous Solutions In determining the reactions of iron immersed in various aqueous solutions‚ three set-ups were made‚ each consists of four test tubes with iron nails
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of the experiment * Aim: To observe the reactions of sulfuric acid as an oxidising agent and as a dehydrating agent. Equipment: * 20mL of concentrated sulfuric acid * 20mL of 2mol/L sulfuric acid * 2 small pieces of each of copper‚ zinc and iron * Sandpaper * 10 test tubes * Test tube rack * 2g of sugar crystals (sucrose) * 2 wooden ice-cream sticks * 10mL measuring cylinders Steps: A: Sulfuric acid as an oxidising agent 1. Clean pieces of metal with
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Copper Hydroxide(s)—Cu(OH)2. For the third reaction‚ 90 drops of H2SO4 from the pipet was introduced to the Copper Hydroxide(s) to create an acid/base neutral reaction to form Copper Sulfate(aq)—CuSO4(aq). Fourthly‚ lab group 6 slowly added granules of Zinc (Zn) to the Copper Sulfate until the reduction method took place and therefore produced metallic copper(s) within the beaker. The excess
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reaction of the permanganate (MnO4-) ion in different media. Group 2‚ those on Part B‚ were set-ups that were done in order to study the reaction of Fe(SCN)2+ ion with that of elemental zinc. While the last‚ Group 3‚ those on Part C were set-ups that investigated the reaction of Fe4[Fe(CN)6]3 with that of elemental zinc. Group 1‚ test tubes A to C‚ vary greatly from each other. This is probably because they differ in the medium used for the reaction to took place. In test tube A‚ brown precipitate
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For an object pulled or pushed horizontally‚ the normal force - N - is simply the weight: N = m g (2) where m = mass of the object (kg‚ slugs) g = acceleration of gravity (9.81 m/s2‚ 32 ft/s2) Frictional Coefficients for some Common Materials and Materials Combinations Materials and Material Combinations Static Frictional Coefficient - μs Clean and Dry Surfaces Lubricated and Greasy Surfaces Aluminum Aluminum 1.05 - 1.35 0.3 Aluminum- bronze Steel 0.45 Aluminum Mild Steel 0.61 Brake material
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