Reaction Types In this lab we were give 9 different elements and had to determine if they were Single Displacement‚ Double Displacement‚ Synthesis‚ Decomposition and Combustion. A.) Aluminum and Copper (II) Chloride‚ my hypothesis is a Single Displacement. B.) Calcium Carbide and Water‚ my hypothesis is a Double Displacement. C.) Zinc and Hydrochloric Acid‚ my hypothesis is a Single Displacement. D.) Alcohol and Oxygen‚ my hypothesis is a Combustion. E.) Lead (II) Nitrate and Potassium Iodide
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these external processes shape the slope landscape in Hong Kong. Chemical weathering involves the decomposition of rock due to the alteration of rock minerals by chemical reactions between the rocks and the water with which they come into contact. Chemical reaction causes certain minerals to change into more vulnerable ones. This weakens the internal structure of the rocks‚ and leads to decomposition. Moisture are particularly crucial to the rate of chemical weathering. High rainfall dissolves rock
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Thermochemistry Heat of precipitation - precipitate is unsoluble salt - precipitate must be prepared through double bond decomposition or precipitation method Do you still remember what is meant by double bond decomposition? [please refer to salts notes] General equation double bond decomposition/precipitation; Ionic equation for precipitation reaction. Salt Solubility in water Li+‚ Na+‚ K+‚ NH4+ All salt dissolve in water Nitrate‚ NO3- All nitrate salt
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Local Studies Chalk is a source of quicklime by thermal decomposition‚ or slaked lime following quenching with water. In southeast England‚ Deneholes are a notable example of ancient chalk pits. Such bell pits may also mark the sites of ancient flint mines‚ where the prime object was to remove flint nodules for stone tool manufacture. The surface remains at Cissbury are one such example‚ but perhaps the most famous is the extensive complex at Grimes Graves in Norfolk. Woodworking joints
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70 14 73 15 40 16 79 17 80 18 84 12 45 48 51 52 55 56 59 59 64 65 75 K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr Potassium Calcium Scandium Titanium Vanadium Chromium Manganese Iron Cobalt Nickel Copper Zinc Gallium Germanium Arsenic Selenium Bromine Krypton 24 96 25 31 115 32 119 33 122 34 128 35 127
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sulphur oxygen sulphur trioxide 2 Fe + O2 ---------> 2 FeO iron oxygen iron (II) oxide Decomposition
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Metals Physical Properties of Metals versus Non-metals Properties | Electrical conductivity | Heat conductivity | Melting and Boiling points | Malleability & ductility | Lustre | Metals | Good | Good | High | High | Shiny | Non-metals | Poor | Poor | Low | Low (Brittle) | Dull | Chemical Properties of Metals versus Non-Metals Properties | Metals | Non- metals | Reaction with oxygen | Form basic or amphoteric oxides | Form acidic or neutral oxides | Ionisation | Lose electrons
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Exothermic vs Endothermic Worksheet 1. Change 1. When calcium carbonate forms calcium oxide and carbon dioxide heat is absorbed. Change 2. Calcium oxide releases heat when shaken with carbon dioxide. Which line BEST describes these changes? 1. change 1 is exothermic; change 2 is endothermic 2. change 1 is endothermic; change 2 is endothermic 3. change 1 is exothermic; change 2 is exothermic 4. change 1 is endothermic; change 2 is exothermic 2. Which of the following involves a chemical
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supervision of a teacher Safety goggles must be worn when working with acids. Factors Affecting Reaction Rate EQUIPMENT AND MATERIALS Part 1. Effect of Particle Size solid zinc‚ approx. 0.5 cm × 2 cm‚ or solid marble chips zinc powder or calcium carbonate powder balance 2 test tubes 1M HCl (approx 10 mL per group) Part 2. Effect of Temperature 3 Alka Seltzer tablets 3 250-mL beakers water at three temperatures – with ice‚ room temperature‚ warm (around 70°C) Part 3. Effect of Concentration
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Chemistry : 1. Aluminium hydroxide on thermal decomposition gives aluminium oxide and water 2. Iron (iii) oxide reacts with carbon forming iron and carbonmonoxide 3. Hydrogen peroxide reacts with lead sulphide forming lead sulphate and water 4. Lithium reacts with nitrogen forming lithium nitride 5. Nickel sulphate reacts with sodium phosphate to form nickel phosphate and sodium sulphate 6. Silver oxide reacts with hydrogen peroxide to form silver ‚ water and oxygen 7
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