Question

which among the following substances cannot be broken down into simpler substances by chemical reaction? 1oxygen 2.Methane 3. sugar 4. water​

Answer 1

Answer:

water

Explanation:

this is my answer

Answer 2

Oxygen cannot be ‘broken down’ into ‘simpler substances’ by chemical reaction.

Explanation:

• An element is made up of the same kind of atoms of the ‘same component’. An element cannot be ‘broken down’ into ‘simpler substances’ by chemical reaction.  

• From the given options ‘oxygen’ is the only element and it cannot be ‘broken down’ into the smaller substances by any ‘chemical reaction’.  

• Methane on the other hand is a gas made up of one atom of carbon and four atoms of hydrogen.

• It is a compound and can be broken down into ‘carbon and hydrogen’.

• Sugar is a complex compound of hydrogen, carbon and oxygen.  

• Water is a compound of two atoms of hydrogen and one atom of oxygen. All these compounds can be ‘broken down’ into ‘simpler substances’ except oxygen.