Notes, Exercises, Videos, Tests and Things to Remember on Introduction to Matter
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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.
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.
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.
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.
The smallest particle of an element is _______.
Molecule is the smallest unit of _______.
Cl2 is an example of ______.
NaCl is an example of ______.
Elements combine together to form a new substance, which is called ______.
A molecule of chlorine is made of ______ atoms of chlorine.
A substance which cannot be further broken down into other simpler substances is called ______.
Which of these are matters?
All the answers are correct