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5.4 Combustion provides another opportunity to examine the conditions under which chemical reactions occur.
The following are signs that a chemical reaction has taken place (and are referred to in some sources (eg. Although the syllabus writers do not want you to think so, a chemical reaction can occur in the absence of any of these indicators and these indicators can be present when the change (under normal definitions) is physical. 4.3 Solve problems and perform a first-hand investigation to measure the change in mass when a mixture such as wood is burned in an open container. 4.4 Outline the changes in molecules during chemical reactions in terms of bond-breaking and bond-making.
4.5 Explain that energy is required to break bonds and energy is released when bonds are formed.
Burning hydrogen to form water is an exothermic process, indicating that the bonds between the hydrogen and oxygen atoms are in total stronger than the new bonds formed in the water molecules.
Similarly, paper, wood petrol and other organic compounds do not burn until a flame or a spark is introduced into the reaction mixture.


A candle will not burn until the solid paraffin has been melted and the liquid paraffin turned into a gas.
As with a bunsen burner flame, there is a clear area under the flame where the gases have not yet reached a temperature high enough for them to burn. The yellow part of the flame is incandescent carbon particles (similar to the glow in an old-fashioned incandescent light bulb). 4.8 Perform first-hand investigations to observe examples of endothermic and exothermic reactions. Ignition temperature (or autoignition temperature) of a substance is the lowest temperature at which it will spontaneously ignite in a normal atmosphere without an external source of ignition (such as a flame or a spark).
4.11 Identify the sources of pollution which accompany the combustion of organic compounds and explain how these can be avoided. Combustion can cause pollution (other than carbon dioxide) if the fuel or the oxidiser is contaminated or if insufficient oxidiser is supplied to the flame. Carbon dioxide should also be regarded as a pollutant because of its contribution to the Greenhouse Effect.


4.12 Describe chemical reactions by using full balanced chemical equations to summarise examples of complete and incomplete combustion.
All organic materials supplied with sufficient oxygen and at a high enough temperature will burn. Rejuvenating oiling-herbal greasing of the full body and nine doors of the men and ten doors of the women body. Hence to gain the maximum benefit  in first detoxification is must Help your body for normal and regular bowlGet toxins out   &  attendbest detoxification colon cleaning program Advance internal cleansing 9 Am to 5 Pm.



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