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Libraries all through the region also have a very good selection of health-related books that can be employed as a reference correct at the library. Some are not even loaned out of the library. However, learners, professors and practising doctors can use these guides to refer to a certain ailment or make notes about some related subject areas. On the web bookstores have a routinely up to date inventory of the newest editions of textbooks that give the newest data on the breakthroughs created in the field of drugs. The Net can undoubtedly be used to buy healthcare guides from on-line shops, as they can occasionally be identified at a significantly decrease cost. On-line retailers these kinds of as Amazon.
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In the scope of its subject, chemistry occupies an intermediate position between physics and biology. The history of chemistry spans a period from very old times to the present. Since several millennia BC, civilizations were using technologies that would eventually form the basis of the various branches of chemistry. It was unsuccessful in explaining the nature of matter and its transformations, but, by performing experiments and recording the results, alchemists set the stage for modern chemistry. In origin, the term is borrowed from the Greek χημία or χημεία.
The basis of such a chemical transformation is the rearrangement of electrons in the chemical bonds between atoms. The number of atoms on the left and the right in the equation for a chemical transformation is equal. The type of chemical reactions a substance may undergo and the energy changes that may accompany it are constrained by certain basic rules, known as chemical laws. Most chemists specialize in one or more sub-disciplines. The atom is the basic unit of chemistry. In a neutral atom, the negatively charged electrons balance out the positive charge of the protons.
1,836 times that of an electron, yet the radius of an atom is about 10,000 times that of its nucleus. The properties of a compound bear little similarity to those of its elements. When a compound has more than one component, then they are divided into two classes, the electropositive and the electronegative components. Thus, molecules exist as electrically neutral units, unlike ions. However, not all substances or chemical compounds consist of discrete molecules, and indeed most of the solid substances that make up the solid crust, mantle, and core of the Earth are chemical compounds without molecules. Examples of pure chemical substances. A collection of substances is called a mixture.