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Compound

Chemistry

COMPOUND

In chemistry, a compound is a substance that results from a combination of two or more different chemical element s, in such a way that the atom s of the different elements are held together by chemical bonds that are difficult to break. These bonds form as a result of the sharing or exchange of electron s among the atoms. The smallest unbreakable unit of a compound is called a molecule Examples of compounds water (H2O) table salt (NaCl) sucrose (table sugar, C12H22O11 The relationship is simple. Atoms are what all matter are ultimately made up of.  Atoms are the smallest units of an element. Elements are substances composed of all the same type of atoms, and have specific chemical properties.  Aluminum for example contains only Aluminum atoms, and no other, and has chemical properties specific to Aluminum. Molecules are combinations of atoms that are not necessarily all the same… Read More »COMPOUND

Chemistry

COMPOUND

In chemistry, a compound is a substance that results from a combination of two or more different chemical element s, in such a way that the atom s of the different elements are held together by chemical bonds that are difficult to break. These bonds form as a result of the sharing or exchange of electron s among the atoms. The smallest unbreakable unit of a compound is called a molecule Examples of compounds: water (H2O) table salt (NaCl) sucrose (table sugar, C12H22O11 The relationship is simple. Atoms are what all matter are ultimately made up of.  Atoms are the smallest units of an element. Elements are substances composed of all the same type of atoms, and have specific chemical properties.  Aluminum for example contains only Aluminum atoms, and no other, and has chemical properties specific to Aluminum. Molecules are combinations of atoms that are not necessarily all the same… Read More »COMPOUND

Chemistry

COMPOUNDS AND FORMULA

COMPOUNDS AND FORMULA  A compound is a pure substance formed by chemically combining at least two different elements. Compounds are two or more different elements combined. Their atoms have been joined or bonded together.   Compounds can be represented by a FORMULA. There must be at least two different types of atom (elements) in a compound. Compounds have a fixed composition and therefore a fixed ratio of atoms represented by a fixed formula, however the compound is made or formed.   In a compound, the elements are not easily separated by physical means, and quite often not easily by chemical means either. A compound has properties quite different from the elements it is formed from. For example, soft silvery reactive sodium + reactive green gas chlorine colourless, not very reactive crystals of sodium chloride.   Chemical word equations For any reaction, what you start with are called the reactants, and… Read More »COMPOUNDS AND FORMULA

Chemistry

DISTINCTION BETWEEN COMPOUNDS AND MIXTURES

DISTINCTION BETWEEN COMPOUNDS AND MIXTURES   The following example of iron, sulphur and iron sulphide will make us understand the difference between mixtures and compounds.   Properties of Iron and Sulphur The following experiment shows the difference in properties between the elements iron and sulphur.   Preparation of a Mixture of Iron and Sulphur Take about 7g of freshly powdered iron, and a little more than 4 g of sulphur. Mix them well. However well it may be mixed, the iron and sulphur particles can be seen separately. Also the above said properties of both iron and sulphur will still be exhibited by this mixture.   Preparation of Iron Sulphide Take this mixture of iron and sulphur in a hard glass test tube. Heat over spirit lamp or burner. The sulphur starts melting. Then the mixture catches fire. Stop heating. The flame spreads throughout the mixture, evolving heat. When it dies… Read More »DISTINCTION BETWEEN COMPOUNDS AND MIXTURES

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