Question

list the characteristics of physical and chemical changes​

Answer 1

Answer:

Explanation:Physical properties are properties that can be measured or observed without changing the chemical nature of the substance. Some examples of physical properties are:

1. color (intensive)
2. density (intensive)
3. volume (extensive)
4. mass (extensive)
5. boiling point (intensive): the temperature at which a substance boils
6. melting point (intensive): the temperature at which a substance melts

the definition of a chemical property is that measuring that property must lead to a change in the substance’s chemical structure. Here are several examples of chemical properties:

1.Heat of combustion is the energy released when a compound undergoes complete combustion (burning) with oxygen. The symbol for the heat of combustion is ΔHc.

2.Chemical stability refers to whether a compound will react with water or air (chemically stable substances will not react). Hydrolysis and oxidation are two such reactions and are both chemical changes.

3.Flammability refers to whether a compound will burn when exposed to flame. Again, burning is a chemical reaction—commonly a high-temperature reaction in the presence of oxygen.

4.The preferred oxidation state is the lowest-energy oxidation state that a metal will undergo reactions in order to achieve (if another element is present to accept or donate electrons).

Answer 2

In a chemical reaction , there is a change in the composition of the substance in question , in a physical chamge there is a difference in the appearance , smell or sample display of matter without a change in composition . Although we call them physical reaction .