DELHI PUBLIC SCHOOL‚RANIPUR‚HARIDWAR LESSON 6:COMBUSTION AND FLAME DATED:24.07.14 1 COMBUSTION: When a substance combines readily with oxygen to give heat and (light) it is called combustion. 2 COMBUSTILE SUBSTANCE: A substance which burns easily to give heat it is said to be combustible. For ex. Wood ‚paper 3 FUEL: A substance that is burnt for obtaining heat and light is called a fuel. Carbon based fuel: wood ‚coal‚wax ‚petrol etc. Non carbon based fuel: hydrogen 4 CHARACTERISTICS OF AN
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Professor Department of Aerospace Engineering IIT Kanpur 13th July‚ 2012 ABSTRACT Numerical Studies of Microcombustion in a Micro-channel There are a lot of methods that converts chemical energy to thermal energy like fuel cells. But combustion is the most important one to obtain thermal energy from various fuels including hydrogen‚ natural gas‚ fuel oils because of its more energy output. Microcombustion is a potential energy source for small devices like unmanned vehicles and micro
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Heat of Combustion Questions 1. When bonds are broken‚ energy is required. When bond are formed‚ energy is released. All combustion reactions are exothermic. Suggest a reason for this in terms of the bonds broken and bonds formed. The energy required to break the bonds is greater than the energy required to form. 2. Explain why the heat of combustion of alkanols increases as the length of the carbon chain increases. The heat of combustion of alkanol increases as the length of carbon chain
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Heats of Combustion of Alkanols Aim: To perform a first-hand investigation to determine the heats of combustion of selected alkanols. Hypothesis: It was predicted that methanol would have the highest molar heat of combustion‚ decreasing as the chains become longer. Equipment: • Three spirit burners containing methanol‚ ethanol and propan-1-ol respectively • Electronic scales • Water • 100ml measuring cylinder • Retort stand and boss-head clamp • Copper beaker • Thermometer Method:
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In this lab‚ I calculated the heat of combustion of paraffin (candle wax) by burning a candle and holding a calorimeter (a soda can) filled with 98.7 mL of water above the flame. The heat released by the candle was absorbed by the water in the can. It was important to place the metal chimney around the candle so that minimal amounts of heat would escape; having too much heat lost to the atmosphere would cause extra error in the calculations. The assumption made was that all heat released from the
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Unit 1 Assignment: Critical Terms Study Guide FS101: Fire Behavior and Combustion Unit 1 Unit 1 Assignment: Critical Terms Study Guide Auto-ignition temperature The minimum temperature to which a material must be raised before combustion will occur. Also called “ignition temperature.” Backdraft A sudden‚ violent reignition of the contents of a closed container fire that has consumed the oxygen within the space when a new source of oxygen is introduced. The introduction of
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COMBUSTION OF MAGNESIUM OXIDE DESIGN Aim/Purpose: To calculate the number of moles and the empirical formula of magnesium oxide. Safety precautions: 1) Wear lab coat 2) Wear gogles. 3)Make sure the bunsen burner is working properly and their is no leakage. 4) Wear gloves. Hypothesis: The weight of the magnesium ribbon increases after burning‚ so this indicated that their was a change in mass. This change happened because of the magnesium ribbon inside the crucible which reacted with Oxygen
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(limewater) 50 mL beaker (for indicator) Procedure My lab partner and I performed a series of experiments to investigate the chemistry of the burning of a candle. The teacher provided the following chemical equation to describe the burning‚ or combustion‚ in the candle: Hydrocarbon fuel + O2 CO2 + H2O The candle we used was a small‚ white emergency candle about 3.5 cm tall. The candle had already been used by someone else because I could see from the black wick that it had been lit before.
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COMBUSTION Name : Natashane McCook Assignment #1 Course : Power Plant Engineering Lecture : Mr: E Thorpe Title : Combustion The term complete combustion generally is used in connection with the burning of hydrocarbons. Combustion is the process of burning that occurs when fuel‚ oxygen‚ and heat are simultaneously present. The result of complete combustion is the release of energy‚ carbon dioxide‚ and water vapor. If the hydrocarbon contains sulfur‚ sulfur dioxide also will be present. On the
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Chemistry – Heats of combustion. To determine the heats of combustion of selected alkanols and to use this information to determine the heat of combustion for a longer chain alkanols. Formula ΔH=-mCΔT Heat of combustion ΔH/n = molar heat of combustion. Materials -100 degrees thermometer -glass stirring rod -aluminium beaker -electronic balance -bosshead and clamp -retort stand Method 1) Set up the apparatus as shown above. 2) Measure the weight of aluminium can 3) Use the
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