1. _________ cannot be separated into two or more simpler substances by chemical methods.
Since elements are the pure substances, so that cannot be separated into two or more simpler substances by chemical methods.
A reaction in which a compound breakdown into two or,more simpler substances is
. A molecule is the pure basic substance that cannot be split into two or more simpler substances by chemical methods.
______ cannot be broken down into two or more simpler substances by chemical methods. (Compounds/Elements)
A mixture can be separated into its physical constituents by chemical methods.