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Ammonia, oxygen, and sulphur can be broken down into simpler substances by chemical reactions, such as decomposition or combustion. Iron filings, being an element, cannot be further broken down into simpler substances through chemical means.
Ammonia (NH3) is a pure substance. It is a compound made up of nitrogen and hydrogen in a fixed ratio, and it cannot be separated into simpler substances by physical means.
Sodium can be separated into simpler substances only by chemical means. Water, salt, and gold are pure substances that cannot be separated into simpler substances by chemical means.
A decomposition reaction results in the breakdown of a chemical into simpler substances. In this type of reaction, a single compound breaks down into two or more simpler substances.
A chemical reaction, though often it is not a simpler substance.
The process that releases energy to convert substances to simpler products is called catabolism. During catabolism, complex molecules are broken down into simpler molecules, releasing energy in the process which can be used by the cell for various metabolic functions.