Archive | Science

The thermal efficiency of a heat engine is given by the formula heat converted into work by total heat in….

The differences between mixtures and compounds are mixtures are made up of two or more pure substances mixed in any proportion whereas compound is a pure substance made up of atoms of two or more elements…

The difference between elements and compounds are an element is a substance which cannot be split up into two or more different substances whereas a compound can be split up into two or more different substances…

The discovery of radioactivity was quite accidental. In 1895, Henri Becquerel kept a photographic plate wrapped in thick black paper in the same drawer in which some uranium salts were kept….

An element is a substance which cannot be split up into two or more simpler substances by any physical or chemical means. It is the simplest form of matter. For example, copper, iron, gold, oxygen…

A compound is a pure substance formed from two or more elements combined together in definite proportion by weight. Alternatively, a compound is a pure substance that can be decomposed by…

Differences between Chemical Reactions and Nuclear Reactions are only the outermost electrons of the atoms take part in chemical reactions. The nuclei of atoms remain unaffected….

The discrepancies in Mendeleev’s periodic table are in position of hydrogen, position of lanthanides and actinides, separation of elements in same group, presence of some anomalous pairs of elements…

The difference between a petrol engine and a diesel engine are in the intake stroke of a petrol engine, a mixture of petrol vapour and air enters into the cylinder…..

A mixture is a material containing two or more elements or compounds in any proportion and the components of which can be separated by simple mechanical means…

The different forms of atomic models are Thomson’s Model of Atom and Rutherford’s Model of Atom that are discussed in detail below…

Complete information on Dalton’s atomic theory, assumptions, merits and demerits are discussed in detail as follows…

Condensation is process by which water vapour is changed into tiny droplets of water while Evaporation is a process by which water changes into water vapour. It is opposite to the process of condensation….

The structural features of the long form the of periodic table are in this periodic table the elements are arranged in order of their increasing atomic numbers. There are seven periods…

The advantages of Modern periodic table over Mendeleev’s periodic table are like Modern periodic table is based on the most fundamental property, the atomic number of elements, while Mendeleev’s periodic table is based upon the atomic masses of elements….

The periodic table helps us to predict some properties of an atom of an element. The position of an element in the periodic table gives the atomic number of the element. From the atomic number we…