predict that galvanizing the nail with zinc and greasing the nail and painting the nail and electroplating the nail will inhibit rusting. I also predict that adding NaCl to the test tube with water and air will promote rusting of the iron nail. Background information: Rusting is the chemical reaction between a metal and oxygen in the presence of water. In this case‚ it is the corrosion of iron. Corrosion is defined as the loss of metallic properties of a metal due to oxidation and it results in them
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electric current/ 4. Define electrolysis. 5. What is decomposition reaction? Give an example 6. Calcium oxide react with water to form calcium oxide. What type of reaction is it? 7. What happen when ferrous sulphate is heated? 8. What happen when copper metal is dipped in silver nitrate solution/Give the balance chemical equation? 9. Write chemical formula for following. a. calcium fluoride.b.iron(II)bromide 10. Write chemical names of a. Ag2O3 b.CuS c. Na2ZnO2
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TOTAL AIM: Experimentally determine the enthalpy change of the displacement reaction between zinc and copper sulphate. Zn (s) + CuSO4 (aq) Cu (s) + ZnSO4 (aq) Materials Required: 1M of CuSO4 Zinc powder Beaker Measuring Cylinder Thermometer Electronic weighing balance Spatula Thermometer Stop watch PROCEDURE: Measure 25cm3 of 1M of CuSO4 in a beaker Using a spatula take out zinc powder from its container and weigh out 2.5g of it using an electronic weighing machine. Use the
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very reactive metal. When stored it reacts with oxygen to form a layer magnesium oxide on its surface. This layer of magnesium oxide is quite stable and prevents further reaction of magnesium with oxygen. The magnesium ribbon is cleaned by sand paper to remove this layer so that the underlying metal can be exposed into air. Question 2: Write the balanced equation for the following chemical reactions. (i) Hydrogen + Chlorine → Hydrogen chloride (ii) Barium chloride + Aluminium sulphate → Barium sulphate
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ethanonoic acid CH3COOH aqueous sulphurous acid H2SO3 aqueous carbonic acid H2CO3 aqueous sulphuric acid H2SO4 aquous nitric acid HNO3 aquous hydrochloric acid HCl aqueous potassium hydroxide KOH aqueous sodium hydroxide NAOH copper(II) sulphate solution CuSO4 Electrolysis of Molten Compounds Molten/aqueous ionic
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divided into two types – Balanced Chemical Equation and Unbalanced Chemical Equation. Balanced Chemical Equation: A balanced chemical equation has number atoms of each element equal on both sides. Example: In this equation‚ numbers of zinc‚ hydrogen and sulphate are equal on both sides‚ so it is a balanced chemical equation. According to Law of Conservation of Mass‚ mass can neither be created nor
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rust and disintegrate. Surface rust is flaky and friable‚ and provides no protection to the underlying iron‚ unlike the formation of patina on copper surfaces. Rusting is the common term for corrosion of iron and its alloys‚ such as steel. Many other metals undergo equivalent corrosion‚ but the resulting oxides are not commonly called rust. Other forms of rust exist‚ like the result of reactions between iron and chloride in an environment deprived of oxygen – rebar used in underwater concrete pillars
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SPM CHEMISTRY Page Compiled and edited by : Jong Kah Yin 1 SPM CHEMISTRY INDEX CONTENT 1 REVISION CHECK-LIST Form 4 Form 5 2 WRITING EQUATIONS 2.1 Charges of ions 2.2 Formulae of compounds 2.3 Reactions of Acid 2.4 Displacement of Metals 2.5 Double decomposition reaction 2.6 Others 3 CALCULATIONS 3.1 3.2 3.3 3.4 3.5 3.6 4 Relative Masses Mole and Number of particles Mole and Mass & Volume of Gases Empirical and Molecular Formulae Calculations involving Acids and Alkali Thermochemistry
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The temperature of the enzyme‚ the pH of the solution‚ the concentration of the enzyme‚ substrate and the product. Also‚ another affector is the number of competitive and non-competitive inhibitors. As I cannot explain them all‚ I have chosen to explain the effect of temperature and also the effect of inhibitors on enzyme activity. Temperature : As the temperature is increased the kinetic theory is applied. More energy is present and the molecules move fast. This increases the chance of collision
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electrons flow from anode to cathode? 6 Which gas is released at the cathode when the electrolyte is water? 7 Which is the more noble metal‚ steel or Aluminium? 8 Which is more electronegative‚ steel or Aluminium? 9 10 If steel and copper were in contact in an electrolyte which would corrode? 11 Name two common Hygroscopic salts. 12 Name three metals used as sacrificial anodes on a steel pipeline. 13 What is the
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