Online Chemistry Notes for Students
Molecules Definition A molecule is a group of two or more atoms of the same or different atoms that represent the smallest identifiable unit of a substance that has the composition and chemical properties of the substance. Molecules are individual units of a pure substance or a compound that interact … Read more
Molar Mass Definition Molar mass is the mass of one mole of a substance obtained by the mass of a compound divided by the amount of the substance present in the compound. Molar mass is considered an average mass of the molecules as the molecular mass might be varied due … Read more
Metals Definition Metals are a group of elements that are characterized by definite physical and chemical properties like malleability, ductility, and electrical as well as thermal conductivity. Metals are primarily present beneath the Earth’s surface and occur in different rocks and structures called ores. Some metals might exist in free … Read more
Ideal Gas Definition An ideal gas is a theoretical gas that obeys the ideal gas law as the gas particles are not subject to interparticle interactions. The gas particles in an ideal gas are considered ideal particles as their interactions are perfectly elastic. The particles do not have definite volume … Read more
Homogenous Mixture Definition A homogenous mixture is the type of mixture in which the composition of the solute is uniform throughout the mixture. The homogenous mixture can be defined by the fact that the division of the mixture into two equal halves results in the distribution of the same amount … Read more
Ester Definition An ester is a group of organic compounds that are derived from organic acids where at least one –OH group is replaced by an -O- group. The functional group in ester is the ester group (COOR) which is usually formed as a result of a substitution reaction between … Read more
Fats Definition Fat is a type of nutrient composed of the ester of fatty acids and their mixtures which occur in living beings and are taken up through different food sources. Fats are a category of lipids and are also the most abundant of all lipids found in nature. These … Read more
Ethanol Definition Ethanol or ethyl alcohol is the primary alcohol that is formed by the substitution of a hydrogen atom in the alkane, ethane by a hydroxyl group. It is an organic compound composed of carbon, hydrogen, and oxygen with the molecular formula C2H5OH. The formula can be written as … Read more
Enzymes Definition Enzymes are biological molecules that act as biological catalysts and accelerate the rate of chemical reactions in living systems. Enzymes are proteins that act on molecules, known as substrates, in order to produce different molecules called products. Most metabolic processes in biological systems require enzymes so that the … Read more
Elements Definition Elements are pure substances that consist of a single type of atoms and cannot be broken down into smaller units by chemical means. Elements are basic chemical species that combine with other elements to form complex species like compounds and molecules. Elements are defined by the number of … Read more