A galvanic cell, also known as a voltaic cell, is an electrochemical cell that produces electricity from a chemical reaction. The reaction involves the transfer of electrons from a metal electrode to an electrolyte, which is usually an aqueous solution of an acid or a base. The electricity produced is used to power electrical devices, …
Reactivity series: The reactivity series is a list of metals, organized from most reactive to least reactive. The most reactive metals are at the top of the list and include potassium, sodium, calcium, magnesium, aluminium, zinc, iron, and lead. Displacement reactions: A displacement reaction is a type of chemical reaction where one element is displaced …
Metals generally react with acids to produce hydrogen gas and a salt. The general equation for this reaction is: Metal + Acid → Salt + Hydrogen For example, when zinc reacts with hydrochloric acid, the reaction produces zinc chloride and hydrogen gas: Zn + 2HCl → ZnCl2 + H2
Metals usually react with oxygen in the air to form metal oxides. This process is known as oxidation. Depending on the type of metal and oxygen, the reaction can be either exothermic (releasing heat) or endothermic (absorbing heat). For example, when iron is exposed to air, it forms iron oxide (rust). Other metals such as …
Reaction of metals with air – വായുവുമായുള്ള ലോഹങ്ങളുടെ പ്രതിപ്രവർത്തനം Read More »
When a metal reacts with water, a metal hydroxide and hydrogen gas are formed. The reaction is usually exothermic, meaning that it releases heat. The ease with which a metal reacts with water depends on its reactivity. The more reactive the metal, the more vigorously it will react with water. Metals such as sodium and …
Reaction of metals with water – ജലവുമായുള്ള ലോഹങ്ങളുടെ പ്രതിപ്രവർത്തനം Read More »
The volume of a gas is directly proportional to the number of moles present. This means that if the number of moles of a gas is increased, the volume of the gas will increase as well. The relationship can be expressed mathematically as: Volume = n × R × T/P, where n is the number …
The number of molecules in a sample depends on the type of molecule and the amount of sample. For example, a teaspoon of water contains about 2.7 x 10^22 molecules of water.
The gram atomic mass is the mass in grams of one mole of atoms of a particular element. It is equal to the atomic weight in atomic mass units multiplied by Avogadro’s number (6.02 x 10^23). Gram atomic mass = (Number of moles of atoms) × (Atomic mass of element) 12.
The relative atomic mass (abbreviated as Ar) is the ratio of the average mass of atoms of an element to 1/12 of the mass of a carbon-12 atom. It is an average atomic mass of an element, calculated from the weighted average of all isotopes of an element, taking into account the abundance of each …
Avogadro’s law states that the number of molecules in a given volume of a gas is directly proportional to the number of moles of the gas, when the temperature and pressure are held constant. This means that if the number of moles of a gas doubles, the number of molecules doubles as well.