It is a mixture.
The noun 'sugar' is a concrete noun, a word for a physical substance.
Hydrochloric acid is the most effective substance that dissolves concrete.
NO
The noun 'honey' is a common, uncountable, concrete noun; a word for a physical substance; a word for a thing.
The noun gold is a common, concrete, uncountable, material noun; a word for a substance, a word for a thing.
mixture
Hydrochloric acid is a chemical that can effectively dissolve concrete.
concrete is a mixture
Concrete is a mixture of different substances (compounds) not a sinle compound.
Gold
Blocks of concrete like substance.
Concrete is a mixture, not a pure substance. It is made up of various substances such as cement, water, aggregates (sand, gravel), and additives. Each of these components retains its own properties and can be physically separated from the others.