Chemical Classification of matter Grade 6 ICSE

All matter is made up of (a)   .

An element is a pure substance

• Yes

• No

An element is made up of __________

• Only one kind of atom

• more than one kind of atoms

• atoms and molecules

• compounds

Atoms of an element do not have the same properties as the element.

• True

• False

Atoms of all elements can exist independently

• True - since atom is the smallest part of an element.

• False- in some elements, 2 or more atoms combine to form a molecule.

• False- in some elements, atoms combine with other elements to form a molecule.

• True- since all elements are made up of the same atoms.

How is the molecule of an element represented?

• By a chemical formula consisting of the symbol of the element followed by the number of atoms in each molecule of the element.

• By a chemical formula consisting of the symbol of the element

• By a chemical formula consisting of the symbols of different elements

• By a chemical formula consisting of the symbol of the element followed by the number of atoms in a compound.

Example of elements in solid, liquid and gaseous state.

• Copper , water and Hydrogen

• Gold, Calcium and Mercury

• Salt( Sodium Chloride) , Mercury and Oxygen.

• Iron , Mercury, Nitrogen.

In a compound

• Atoms of different elements are mixed together.

• Different elements are chemically combined.

• Many atoms of an element are chemically combined.

• Molecules of an element are chemically combined.

The smallest unit of a compound is a or an (a)  

A compound is made of :

• 2 or more atoms of the same element

• 2 or more molecules of the same element

• 2 or more atoms of different elements