CHEMISTRY [2 Mark Question Answer]

(a) In chemistry, when two or more substances mix with each other without participating in a chemical change, the resulting substance is called a Mixture.
(b) Characteristics of a mixture :-
• The mixture has no fixed composition.
• To form mixture energy is neither produced nor evolved.
• The mixture has no fixed melting points and boiling points.
• Mixture retains the properties of its components.
• Components of mixtures can be separated by simple physical methods.

(a) Compounds are chemical substances made up of two or more elements that are chemically bound together in a fixed ratio.
(b) Characteristics of a compound :-
• Each Component of the compound are present in a fixed ratio.
• It has a homogeneous composition.
• The compounds have fixed melting points and boiling points.

(a) An element is a pure substance consisting of only one type of atom which all have the same numbers of protons in their nuclei.
(b) Characteristics of an Element :-
• Atomic number. The atomic number is one of the fundamental characteristics of an element....
• Atomic mass. This is the mass of an atom....
• Density. The formula for density is the number of units of mass/unit volume of the substance. ...
• Boiling point.
• Ionic radius.
• Melting point.

(a) Pure substances are substances that are made up of only one kind of particle and have a fixed or constant structure.
(b) Characteristics of pure substances :-
• Pure substances are homogeneous in nature.
• They have fixed melting and boiling points.
• They are made up of the same kind of particles.