What is a chemical change?

The substance is subject to a chemical change when its molecular structure changes either by adding energy to the substance or by mixing two substances together. In both cases, chemical bonds are broken inside the atomic structure and re -establish a different substance. The new substance usually has different physical and chemical properties than the original.

There are two types of changes in chemistry. A physical change is when the form of a substance, such as normal phase changes in water due to temperature. As the temperature rises from the freezing point, it changes from a solid form of water, ice; into liquid form, water; The gaseous form with steam. The synthesis reaction occurs when two or more simple materials are connected to make the third, more complications material. The reaction of decomposition is to break more complex substances into its simple parts. In responses to one limitation, one element replaced another element in a more complex material and created a new substance. Reactions with double replacement are similar to one replacement reactions, only two elements in one materialreplacing two elements in another compound to form the final material.

The laws on the savings of matter and energy state that neither mass nor energy is created or destroyed, has not changed only to another state. Chemical changes are also classified according to what happens to energy due to the reaction. Endothermic reactions absorb energy, usually heat or electricity. Exotermic reactions produce energy, causing the substance to feel hot due to energy from the chemical bonds of substances.

There are several ways to find out if there has been a chemical change. Changing the color of the substance may mean that there has been a chemical change. Changing leaf colors in autumn, reddish -brown rust and browning apple meat are examples of chemical changes that are depicted by changes in the fabric.

The change in the fragrance of the substance may also be a sign that there has been a chemical change. Sulfur scent of rottenThe eggs and the smell of spoiled milk are signs that eggs and milk have gone through chemical reactions. Although the smell is perhaps more evident, there may be other, visible indications of such changes.

Unlike physical changes, chemical changes are irreversible. Broken aluminum with a foot is a physical change. Theoretically, it is possible to remove the dents and wrinkles inserted into the aluminum and bring them back to its original state. Burning a piece of paper is a chemical change. Once it is burned, it cannot be incredible.