10. When wood, natural gas, oil, or any other fuel burns, ..... with oxygen in the air to produce heat. Combining substances in the fuel Substances in the fuel that combine Substances in the fuel combine A combination of substances in the fuel

Context: Fossil fuels are nonrenewable resources because they took millions of years to attain their present form.We use fossil fuels such as coal, oil, and gas to heat our houses, run industry, and transport. They are usually hydrocarbons (compounds of carbon and hydrogen). When they are burnt, they combine with oxygen from the air. The carbon becomes carbon dioxide; hydrogen becomes hydrogen oxide called water; while energy is released as heat. In the case of coal:Carbon + Oxygen      →→  carbon dioxide + heat energyHydrocarbon + Oxygen    →→   carbon dioxide + water + heat energy

Which gas is produced when a fuel burns in sufficient supply of air

Why do substances burn with or without a flame?Have you ever observed either a coal or a wood fire? If not, the next time you get achance, take close note of what happens when the wood or coal starts to burn. Youhave seen above that a candle or the LPG in the gas stove burns with a flame. However,you will observe the coal or charcoal in an ‘angithi’ sometimes just glows red andgives out heat without a flame. This is because a flame is only produced when gaseoussubstances burn. When wood or charcoal is ignited, the volatile substances presentvapourise and burn with a flame in the beginning.A luminous flame is seen when the atoms of the gaseous substance are heated andstart to glow. The colour produced by each element is a characteristic property ofthat element. Try and heat a copper wire in the flame of a gas stove and observe itscolour. You have seen that incomplete combustion gives soot which is carbon. Onthis basis, what will you attribute the yellow colour of a candle flame to?

If methane is burnt in sufficient oxygen the products formed are :A.

escribe how carbon monoxide, soot (carbon particles), sulfurdioxide and oxides of nitrogen are produced by burning fuels