Typical types of change include the processes involved in photosynthesis, a process in which carbon dioxide and water are changed into sugars and oxygen by plants, digestion in which energy rich materials are used by organisms to grow and move, the Krebs cycle which liberates energy from stored reserves, protein synthesis which enables organisms to grow using processes controlled by RNA, etc. Decomposition of organic material is also within the scope of biochemistry although in this case it is the growth and activity of fungi, bacteria and other micro-organisms that is involved. The chemistry is always highly complex and is still not fully understood. It is a chemistry where most reactions are controlled by complex proteins called enzymes and are moderated and limited by hormones. Other reactions include, methylation, condensation reactions, polymerisation, halogenation etc.īiochemistry deals with the chemistry of the growth and activity of living organisms. Typical examples of organic chemical changes include cracking heavy hydrocarbons at an oil refinery to create more gasoline from crude oil, as gasoline is in higher demand than the heavier hydrocarbons, such as residual fuel oils. These compounds include mineral oil and all of its products and much of the output of industries manufacturing pharmaceuticals, paints, detergents, cosmetics, fuels etc. Organic chemistry is concerned with the chemistry of carbon and the elements and compound with which it reacts. Typical types of change include neutralization (mixing an acid with a base, resulting in water and salt), oxidization including combustion, redox reactions etc. The changes typically take place in laboratories, or on a larger scale in heavy industries. Inorganic chemistry describes the reactions of elements and compounds that, in general, do not involve carbon. This is an example of a chemical change because the end products are chemically different from the substances before the chemical reaction.Ĭhemists categorize chemical changes into three main classes: inorganic chemical changes, organic chemical changes and biochemical changes. So much energy is released that the hydrogen gas released spontaneously burns in the air. An example of a chemical change is the reaction between sodium and water to produce sodium hydroxide and hydrogen. When chemical reactions occur, the atoms are rearranged and the reaction is accompanied by an energy change as new products are generated. Understanding chemical changes is a major part of the science of chemistry. Some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. These processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. ( Learn how and when to remove this template message)Ĭhemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. JSTOR ( January 2010) ( Learn how and when to remove this template message).Unsourced material may be challenged and removed. Please help improve this article by adding citations to reliable sources. This article needs additional citations for verification.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |