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If a substance undergoes a decomposition reaction, it is a compound. Pure elements cannot decompose because there is nothing for them to decompose into.

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Q: How can a decomposition reaction help you determine whether a pure substance is an element or a compound?
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Related questions

What Type of chemical reaction in which a compound is broken into smaller substance?

Its a decomposition reaction


What type of reaction occur when complex compound are broken down into simpler substance?

This kind of reaction is called "decomposition".


What is it when a compound breaks apart into separate substance?

It's called Decomposition. For example, 2KClO3 --> 2KCl + 3O2


What is the difference between a combination reaction and a decomposition reaction?

Combination reaction, sometimes called synthesis, in composition elements get together to form a compound. eg 2Mg+O2--> 2MgO Decomposition, in decomposition, the compound comes apart.eg CaCO3-->CaO+CO2


what do we call the chemical reaction that uses an electrical current to decompose a compound?

electrolytic decomposition reaction.


The opposite of a decomposition reaction is called?

A formation reaction :) Decomposition implies the breakdown of a compound, formation implies the production of a compound.


How is a decomposition reaction done?

A method is the thermal decomposition of a compound.


What does a substance break down into during a decomposition reaction?

A substance breaks down into two or more simpler substances during a decomposition reaction.


Is 2HgO a decomposition reaction?

Mercuric oxide is a compound not a reaction.


What reaction occurs when a substance is broken down into two or more simpler substances in a chemical reaction?

Breaking a substance down into two or more simpler substances is called as decomposition reaction.


Is decomposition a type of reaction?

Yes, decomposition is a type of chemical reaction. This chemical reaction breaks down a compound into its individual elements.


What is combination and decomposition?

when different indivisual element combine to form a compound, this reaction is called combination A reaction in which a Compound is decomposed into its constituent elements is called decomposition