chemical

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Chemical substance
A chemical substance is a material with a definite chemical composition. It is a concept that became firmly established in the late eighteenth century after work by the chemist Joseph Proust on the composition of some pure chemical compounds such as basic copper carbonate. He deduced that: "All samples of a compound have the same composition; that is, all samples have the same proportions, by mass, of the elements present in the compound". This became known as the law of constant composition. Later with the advancement of methods for chemical synthesis particularly in the realm of organic chemistry; the discovery of many more chemical elements and new techniques in the realm of  analytical chemistry used for isolation and purification of elements and compounds from chemicals that led to the establishment of modern chemistry, the concept was defined as is found in most chemistry textbooks. However, there are some controversies regarding this definition mainly because the large number of chemical substances reported in chemistry literature need to be indexed.
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Composé chimique
Un composé chimique est une substance issue de l'assemblage de plusieurs types d'atomes issus d'éléments chimiques différents dans des proportions définies. Cette loi a été énoncée en 1794 par le chimiste français Joseph Proust. Les atomes sont liés entre eux par des liens énergétiques qui peuvent être de natures différentes et qui sont classés en trois catégories.
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Chemischer Stoff
Ein chemischer Stoff ist Materie regelmäßiger Beschaffenheit, die sich durch die Elementareinheiten, aus denen sie zusammengesetzt ist, definiert. Diese Elementareinheiten können AtomeMoleküle oder Formeleinheiten (etwa bei Salzen) sein. Chemische Stoffe werden durch ihre physikalischen Eigenschaften, wie DichteSchmelzpunktelektrische Leitfähigkeit etc., charakterisiert.
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Kemikalie
En kemikalie karakteriseras av sin reaktivitet och sina fyskalkemiska egenskaper. Det gör att ämnen som bara skiljer sig i isotopsammansättning är olika kemikalier, jämför vatten mot deuteriumberikat vatten. Alla kemikalier har ett eget CAS-nummer som gör att man kan skilja på dem. Begreppet kemikalie används ofta fel, i synnerhet av icke-kemister. Det är viktigt att skilja på kemikalier, kemiska produkter, kemikalieklasser och varor.
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chemical
kemikalija  
 
kemijskim  
 
kemijski proizvod  
 
kemijski preparat  
 
kemijski  
 
kemijske  
 
kemijska  

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