Can we imagine a world without oxygen, nitrogen, water, or carbon dioxide? Without any of these, there would be no life at all. All the below-mentioned compounds are covalent compounds formed by sharing of electrons. Non-metal atoms share the valence electrons and form molecules. These shared pairs of electrons contributed by each of the atoms …
Intermolecular forces are responsible for most of the physical and chemical properties of matter. Although the exact nature of these forces are very complicated, there are no conceptual difficulties. The basic building block in molecular compounds is the molecule, which is formed by relatively strong covalent bonds. Molecules are then held together in the solid …
Atoms are composed of three fundamental particles, electrons, protons and neutrons. Protons and neutrons are placed at the center of the atom that is called as a nucleus. Electrons are placed around the nucleus in the shell which is further divided in sub-shells and orbitals. The outermost shell of an atom is called as valence …
Changes in energy are always accompanied by some kind of change (chemically or physically). During the reaction, the old bonds in the reactants break and the new bonds in the products are formed. During this breaking and making of bonds, there is a difference in energy. If the energy required to break the bonds is greater …
[Solved]- Is burning wood a Chemical Change or Physical Change? Read More »
The idea of the matter was first given by Greek philosophers Leucippus and Democritus. The idea was that matter was made of building blocks or particles. They suggested that matter is composed of atoms that are separated by empty spaces. They also proposed that the apparent changes in matter are caused by changes in the way these atoms are grouped …
Doppler Effect Equation: The Austrian Physicist Christian Doppler formulated the Doppler effect in 1842. According to him, Doppler effect is nothing but the change in wave frequency when an observer is moving with respect to the source. Let us consider an example, if a stationary observer on a platform listen to the sound of the …
The main constituents of air are nitrogen and oxygen. It also contains carbon dioxide and water vapour in small amounts. Inert gases and ozone are also present in trace amounts in air. Apart from these gases, air also contains some impurities, like sulphur dioxide, hydrogen sulphide, nitrogen dioxide, dust particles, etc. Carbon dioxide gas is …
Condensation takes place when the gaseous particles change themselves into a liquid state. It is an exothermic process. The gaseous particles have more heat than liquid. On losing heat, the temperature becomes lower than the boiling point. Hence, they change their state into liquid. To a particular situation, gas particles have a sufficient temperature. When …
[Solved] – Is Condensation Exothermic or Endothermic Read More »
Whenever energy is supplied to or taken out of matter, It always brings about one or the other kind of change. Taking examples from our daily life- The heat energy of the sun causes the evaporation of water. The water vapors on losing heat energy at higher altitudes change to cloud snow. When an electric …
[Solved]- Is Evaporation Endothermic or Exothermic Read More »
Combustion is an exothermic process in which heat/energy is given out. The combustion process takes place with the help of oxygen a substance that reacts with the oxygen and gives off energy. The substance which takes part in the combustion reaction is called fuel. This fuel maybe is in the form of solid, liquid, or …
[Solved]- Is Combustion Endothermic or Exothermic Read More »
