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Hindi good nice fantastic ab
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State three usefulness of plants and animals to humans
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Combustion is the process in which a substance reacts with oxygen to give off heat.
Example: a magnesium ribbon starts burning when heated in a flame.
Given a combustible substance and oxygen, if the substance reaches its ignition temperature, it will start burning. Spontaneous combustion is a special case of combustion where a material burns without heat being supplied from an external source. Example: a piece of phosphorus suddenly starts burning when kept in a dish on a table.
What could be the LIKELY reason for spontaneous combustion to happen?
A . Non-metals absorb heat from the atmosphere more quickly than metals and are likely to combust spontaneously because of this.
B. Materials that combust spontaneously have a special property - they need not reach the ignition temperature to combust.
C. Spontaneous combustion is a process that requires only the presence of the combustible
substance; heat and oxygen are not required.
D. In the case of substances that combust spontaneously, a chemical reaction takes place which
generates the heat required for combustion.
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