PROPERTIES OF MATTER
Substances identified by their properties and composition. Physical properties appear during physical changes in them are part of all the properties that can be seen or measured with an instrument (color, density, hardness, melting temperature. Temperature rise, crystalline forms, treteshmëria, thermal and electrical conductivity, etc.). The physical properties are constants characteristic under certain external conditions and certain aggregate state of the substance.
Describe the chemical properties of the substance's ability to form new substances, in most cases, reacting with other substances or being broken down (decomposed) new substances should not be related in any way with the initial substance. Eg iron rust when left in moist air, so it is not resistant to humid air.
Most often changes associated with chemical properties, resulting from the reaction of a substance with one or more other substances. However, the presence of a second substance is not domoesdoshme, because in some cases the presence of energy (usually heat or light) can cause decomposition of substances. Eg hydrogen peroxide in the presence of heat or light breaks down into water and oxygen substances and say that this is one of its chemical properties.
