Question

A substance ‘X’ on heating gives Y and Z. What is X - An element or a compound ? State two differences between an element and a compound

Answer 1

X is a compound because elements react to form compounds.

Two differences between elements and compounds are :

1. Element consists of one kind of atoms whereas compounds consists of one kind of molecules made up of two or more types of atoms.

2. Element cannot be broken into simpler substances but compounds can be broken into simpler substances.

Example of an element is Hydrogen and example of a compound is Water

Answer 2

1) If a substance X on heating gives two different substances Y and Z, then the substance is a compound and not an element. Both elements and compounds are pure substances. ... For example carbon is an element composed of only carbon atoms while NaHCO3, CaCO3 are compounds composed of atoms of more that one element.