why is the combustion of methane exothermic

In this reaction, the temperature goes down so it is endothermic. 4 years ago . The equation for this reaction is: Some bond dissociation energies are given in the table. White phosphorous dissolved in a solvent is dripped onto a piece of paper. %PDF-1.5 %���� Methane burns in oxygen to make carbon dioxide and water vapor. The combustion of methane is an example of an exothermic reaction. (iv)€€€€Explain why, in terms of the energy involved in bond breaking and bond making, the combustion of methane is exothermic..... (3) (d) €€€€Methane reacts with chlorine in the presence of sunlight. Combustion reaction produce products which have a lower energy state than the reactants which were present before the reaction. .. in the sum of bond breaking of CH4 [endothermic] and forming new bonds as CO2 and H2O are made[ exothermic], the overall change shows more heat given out than required for the bond breaking bit. An exothermic reaction is exothermic because the products are at a lower energy than the reactants. x�+T0T0 B�����f����� N� endstream endobj 3 0 obj<> endobj 4 0 obj<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI]>>>> endobj 5 0 obj<>/Font<>/XObject<>/ProcSet[/PDF/Text/ImageC]/ExtGState<>>>/Subtype/Form/FormType 1/Matrix[1.0 0.0 0.0 1.0 0.0 0.0]/PTEX.InfoDict 21 0 R/PTEX.PageNumber 1/PTEX.FileName(/tmp/pdflab/tempfile22.pdf)>>stream Join Yahoo Answers and get 100 points today. When the sugar burns by reacting with oxygen, it produces mostly water and carbon dioxide. In an endothermic reaction, more energy goes into breaking the bonds of the reactants than is released when the bonds in the products are formed. In an exothermic reaction, more energy is released when bonds in the products are formed than is used to break the bonds in the reactants. xڍ�K Do radioactive elements cause water to heat up? This is shown by larger energy arrows coming out of the products and smaller energy arrows going into the reactants. Below is a hydrocarbon combustion animation showing the net reaction that occurs when methane combines with oxygen. No idea what to write lol x. All rights reserved. A fuel (sugar for example) has a great deal of chemical potential energy. Anonymous. Why is the periodic table organized the way it is? The combustion of methane CH4 is an exothermic process. The demonstration shown in this video is very dangerous. Get answers by asking now. Energy is used to break the bonds of the reactants. ��a�E��ʺR��RY�� *}��C��=��S��]�۴ߖ�c!UE�U���I�q�v�4�:�%t5$���VO�. �0E�]E6�x�T[�ġkp�H��O���$��s?B��`�|�6�8;Z���qPz������ս@��V�[����%��cC��9@�h2��-���Y�}Q}��)~.� �4� endstream endobj 2 0 obj<>stream

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