when rain falls, when there is a bush-fire, i know you may think "what a bush-fire?" but sometimes government or people do bush-fires on purpose to make fertilization (some plants have to be burnt to fertilize
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Some common man-made chemical reactions include combustion (burning of fuels), fermentation (conversion of sugars into alcohol), polymerization (formation of plastics), and neutralization (mixing an acid and a base to form a salt and water).
Chemical Energy
An element is a substance that cannot be broken down into simpler substances by chemical reactions. Each element is made up of only one type of atom. Examples of elements include oxygen, gold, and carbon.
No, physical changes do not involve the formation of new substances and do not involve chemical reactions. Physical changes only alter the appearance or state of a substance without changing its chemical composition. Examples of physical changes include changes in shape, size, color, or state of matter.
in chemical reactions, energy is absorbed or released when chemical bonds are broken and new ones are formed.
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