(a)6CO2 + 6H2O C6H12O6 + 6O2 (b) C6H12O6 + 6O2 6CO2 + 6H2O (c)CaCO3 CaO +CO2 (d)2H2O 2H2 +O2 Q.15 What type of reaction is represented by CaO +CO2 → CaCO3 (a)Combination (b) Decomposition (c) Displacement (d) Double displacement Q.16 Which of the following Cannot be decomposed by sunlight? (a)NaCl (b) CuCl2 (c)CaCl2 (d) none of these Q.17 Which of the following type of energy is used by living organisms to perform
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Name____________________________ Pd. _______ Purpose: The purpose of this lab is to look at some properties of three common compounds‚ CO2‚ H2‚ O2. Materials: Zinc Hydrochloric acid Hydrogen peroxide Manganese dioxide Calcium Carbonate (marble chips) Safety:The Hydrochloric acid used in this experiment could cause blindness upon contact with the eyes. Wear your goggles and handle it with care. Procedure: I. Place approximately 0.5 g of Zn metal in a test
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compounds; • explain the general characteristics of the alkaline earth metals and their compounds; • describe the manufacture‚ properties and uses of industrially important sodium and calcium compounds including Portland cement; the biological significance of sodium‚ potassium‚ magnesium and calcium. • appreciate The s-block elements of the Periodic Table are those in which the last electron enters the outermost s-orbital. As the s-orbital can accommodate only two electrons‚ two groups
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We have no way of knowing what the two products are. 19. The formula for europium carbonate is Eu2(CO3)3. On the basis of this information‚ the formula for the chlorate of europium would be expected to be? a. EuCl2. b. EuCl3. c. Eu2(ClO3)3. d. Eu(ClO4)2. e. Eu(ClO3)3. CO3 has a 2- charge‚ therefore the Eu must have a 3+ charge.
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UNIVERSITY OF CAMBRIDGE INTERNATIONAL EXAMINATIONS International General Certificate of Secondary Education *4308315385* CHEMISTRY Paper 2 Candidates answer on the Question Paper. No Additional Materials are required. READ THESE INSTRUCTIONS FIRST Write your Centre number‚ candidate number and name in the spaces at the top of this page. Write in dark blue or black pen. You may need to use a pencil for any diagrams‚ graphs or rough working. Do not use staples‚ paper clips‚ highlighters‚ glue or correction
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Thermal decomposition of gold oxide * 2. Light decomposition (photolysis) of silver bromide * 3. Electrolytic decomposition of molten lead (II) bromide * Synthesis reaction is the formation of a compound from its elements or a more complex compound from simpler compounds. * Application of decomposition reaction in the real world: * Rust is an oxide of iron that forms when iron
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9.5 – Industrial Chemistry (Option): Δ. Construct word and balanced formulae equations of all chemical reactions as they are encountered in this module: The EQUILIBRIUM Constant: For the basic reversible reaction‚ depicted as: aA + bB cC + dD; Uses of SULFURIC ACID: Fertiliser Production: Creating ammonium sulfate: sulfuric acid + ammonia ammonium sulfate H2SO4 (aq) + 2NH3 (aq) (NH4)2SO4 (aq) Dehydrating Agent: Dehydration of ethanol: ethanol ethylene + water C2H5OH (l) C2H4 (g) + H2O (l) Dehydration
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1. Introduction The word ‘Karst’ comes from the Krs Plateau in Slovenia‚ where karst environments were first studied closely. The Slav people use ‘Krs’ to refere to ‘bare stony ground’. More specifically geomorphology refers to karst as a type of terrain characterised mainly by caves‚ sinkholes and complex drainage networks. The majority of karst formations occur in soluble rocks such as limestone and dolomite (although recent discoveries have revealed karst formations in more resistant rocks such
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Weathering- is a process where rocks are physically broken down or chemically modified by climatic or biological elements. Works through 3 processes: physical weathering‚ chemical weathering and biological weathering. Physical weathering- is the breaking down of rocks into smaller fragments brought about by physical (mechanical) forces. Works through 4 processes: alternate expansion and contraction‚ frost action‚ pressure release and salt crystal growth. Alternate expansion and contraction- this
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CHEMICAL REACTIONS AIM: To perform and observe the following reactions and classify them into: (i) Combination reaction (action of water on quick lime) (ii) Decomposition reaction (action of heat on ferrous sulphate crystals) (iii) Displacement reaction (iron nails kept in copper sulphate solution) (vi)Double decomposition reaction (reaction between sodium sulphate and barium chloride) APPARATUS REQUIRED: 1. A rack of at least six clean test tubes and a boiling tube (hard glass
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