The first classification of elements was as metals and non-metals. After the
The basic cause of chemical bonding is to attain noble gas configuration
Acids are the substances which taste sour, change blue litmus red, are
A continuous change in the position of the object with respect to time is called
Inertia: The property of a body which tends to keep the body in its state of
The gravitational force due to earth is called
Work: The product of displacement and force in the direction of displacement
Thermal energy, also called heat, is a form of energy which gives us sensation
Light is the form of energy which makes the objects visible to us. When light reaches from
There are two types of charges: positive charge, i.e., the charge that a glass
Magnet is a naturally occurring or artificially designed material which has a
Sound is the form of energy which gives the sensation of hearing. It travels
The earth came into existence 4-5 billion years ago and life originated around 3.4 billion
Earth is the only planet in our solar system which sustains life. But earth
Cell is the structural and functional unit of life. A typical cell includes a
Life Processes such as Nutrition, Respiration, Circulation and Excretion are
Blood vessels carry oxygen from alveoli to tissues. Cells of tissues take up the oxygen. In the
Blood transports food and oxygen to all the cells of the body. It is made of fluid plasma and
Excretion is the removal of harmful wastes like urea by kidneys, sweat from
Nervous system (NS) and endocrine system together ensure that all the parts of
Features passed down from one generation to the other is Heredity or
Air is a mixture of different gases. It contains oxygen, Nitrogen, Argon,
Water is the abundant natural resource available. Although sea water is the largest natural
Elements are broadly classified as metals nonmetals. Metals can be distinguished from non-metal
Diamond has a three-dimensional network of covalently bonded carbon atom. It
In an ecosystem, living organisms interact among themselves and also with the
Environmental problems may arise due to natural disasters or due to human
According to Dalton’s atomic theory, the atom is considered to be the smallest
A chemical equation is a shorthand description of a reaction. It symbolically
According to law of constant proportions, a sample of a pure substance always
Anything that has mass and occupies space is matter. There are three different
Measurement is a process of comparing a physical quantity with a standard
