Next-Gen

elements,compounds&mixtures

by Elaineshanshan
Last updated 7 years ago

Discipline:
Science
Subject:
Life Science

Test Glog

Elements and Compounds are pure substances. An element is a pure substance that cannot be decomposed into simpler substances. Elements are listed in the Periodic Table of the Elements. Each element has a 1 or 2 letter symbol. A compound is a pure substance that can be decomposed into simpler substances. Compounds are made up of two or more elements.

Elements, Compunds & mixtures.

ElementsAn element is defined as a pure substance made up of one type of atoms and cannot be further subdivided into simpler substances by any physical or chemical means. An element can be represented by using a symbol

A chemical compound is a pure chemical substance consisting of two or more different chemical elementsthat can be separated into simpler substances by chemical reactions.Chemical compounds have a unique and defined chemical structure; they consist of a fixed ratio of atoms that are held together in a defined spatial arrangement by chemical bonds. Chemical compounds can be molecular compounds held together by covalent bonds, salts held together by ionic bonds, intermetallic compounds held together by metallic bonds, or complexes held together by coordinate covalent bonds. Pure chemical elements are not considered chemical compounds, even if they consist of molecules which contain only multiple atoms of a single element.Elements form compounds to become more stable. They become stable when they have the maximum number of possible electrons in their outermost energy level, which is normally two or eight valence electrons. This is the reason that noble gases do not frequently react: they already possess eight valence electrons.

MixturesA mixture is defined as an impure substance made up of two or more types of elements or compounds or both mechanically mixed in any proportion, and it can be further subdivided into simpler substances by physical means.The constituents of a mixture retain their original properties.The constituents of a homogenous mixture are uniformly mixed thoroughout the mixture. The properties and composition of a homogenous mixture are the same throughout the mixture.The constituents of a heterogenous mixture are not uniformly mixed thoroughout the mixture. The properties and composition of a heterogenous mixture are not the same throughout the mixture.

ChemicalsA compound is defined as a pure substance made up of two or more types of elements chemically combined in a fixed proportion, and it can be further subdivided into simpler substances by chemical means only. A molecule is the smallest part of a compound, whose properties are the same as those of the compound. A compound can be represented by using a chemical formula.


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