Note on Introduction to Matter

  • Note
  • Things to remember
  • Videos
  • Exercise
  • Quiz

Introduction

Various types of substances can be found in our surrounding. Some substances are very simple whereas some are very complex. Some substances can be broken into other simpler substances while some substances cannot be broken. A substance which cannot be further broken down into other simpler substances is called an element. Hydrogen, oxygen, nitrogen, chlorine, mercury, lead, etc. are the examples of the element. There are altogether 109 elements known so far. Out of them, 92 elements are naturally found and remaining 26 elements are artificially prepared by scientists. Elements combine together to form a new substance, which is called a compound. Salt, water, chalk, carbon dioxide, etc. are the examples of a compound.

Source; thescienceclassroom.org Fig: Classification of Matter
Source; thescienceclassroom.org
Fig: Classification of Matter


Atom

An atom is the smallest particle of an element which can take part in a chemical reaction. They are different in size, masses, and chemical properties. For example atoms of hydrogen are similar in all respects whereas the atoms of oxygen elements are different. 118 elements have 118 different types of atoms. So, different elements have different atoms.

Source: www.enotes.com Fig: Atom
Source: www.enotes.com
Fig: Atom

Molecule

The smallest particles of an element or compound are called molecule. For example, a molecule of chlorine is made of two atoms of chlorine, it is denoted by Cl. The molecule of a compound contains two or more atoms of different elements. For example, a molecule of water (H2O) contains two atoms of hydrogen and one atom of oxygen. It is represented by H2O.

Source: www.enotes.com Fig: Water molecule
Source: www.enotes.com
Fig: Water molecule

  • A substance which cannot be further broken down into other simpler substances is called an element. Hydrogen, oxygen, nitrogen, chlorine, mercury, lead, etc. are the examples of element.
  • There are altogether 109 elements known so far.
  • An atom is the smallest particle of an element which can take part in a chemical reaction.
  • Elements combine together to form a new substance, which is called compound.
.

Very Short Questions

An element is simplest pure substances that can neither be divided into simpler ones nor can it be made from two or more substances by any method e.g: hydrogen, helium and etc.

A compound is a substance formed by the combination of two or more than two elements.

An atom is the smallest particle of an element which can take part in the chemical reaction.

The smallest particles of an element or a compound is called molecule.

Any two examples of compounds are sodium chloride and sodium oxide.

0%
  • The smallest particle of an element is _______.

    none of the answers are right
    an atom
    a compound
    a molecule
  • Molecule is the smallest unit of _______.

    a compound


    an element


    Mass


    Matter


  • Cl2 is an example of ______.

    an atom


    a compound


    a molecule


    an element


  • NaCl is an example of ______.

    an atom


    an element


    a molecule


    a compound


  • Elements combine together to form a new substance, which is called ______.

    compound


    element


    molecule


    mixture


  •   A molecule of chlorine is made of ______ atoms of chlorine.

    3


    4


    1


    2


  • A substance which cannot be further broken down into other simpler substances is called ______.

    element


    compound


    atom


    molecule


  • Which of these are matters?

    All the answers are correct


    Barium


    Sand


    Chlorine


  • What is matter?

  • You scored /9


    Take test again

DISCUSSIONS ABOUT THIS NOTE

No discussion on this note yet. Be first to comment on this note