Write 5 important points of the lesson "balancing equations".
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hi my dear friend, I am going to answer your question right now.....
* a chemical equation is a symbolic representation of a chemical change.
-(+)-(+)-(+)-(+)-(+)-(+)-(+)-
* a balanced chemical equation explains about reactants, products and their physical states during the reaction
-(+)-(+)-(+)-(+)-(+)-(+)-(+)-
* a chemical equation should always be balanced according to the law of conservation of mass.
-(+)-(+)-(+)-(+)-(+)-(+)-(+)-
* the chemical reaction in which heat is observed are called endothermic reactions and in which heat is evolved or exothermic reactions
-(+)-(+)-(+)-(+)-(+)-(+)-(+)-
* a chemical equation containing simply symbols of elements and molecular formula of the substances without balancing is known as a primary or skeleton equation.
-(+)-(+)-(+)-(+)-(+)-(+)-(+)-(+)
*he symbols of elements and formulae of the compounds should not be changed but only their Coefficient should be altered while balancing the chemical equation.
* Coefficient should be least possible whole numbers.
==> hope this answer is clear and useful to you....
* a chemical equation is a symbolic representation of a chemical change.
-(+)-(+)-(+)-(+)-(+)-(+)-(+)-
* a balanced chemical equation explains about reactants, products and their physical states during the reaction
-(+)-(+)-(+)-(+)-(+)-(+)-(+)-
* a chemical equation should always be balanced according to the law of conservation of mass.
-(+)-(+)-(+)-(+)-(+)-(+)-(+)-
* the chemical reaction in which heat is observed are called endothermic reactions and in which heat is evolved or exothermic reactions
-(+)-(+)-(+)-(+)-(+)-(+)-(+)-
* a chemical equation containing simply symbols of elements and molecular formula of the substances without balancing is known as a primary or skeleton equation.
-(+)-(+)-(+)-(+)-(+)-(+)-(+)-(+)
*he symbols of elements and formulae of the compounds should not be changed but only their Coefficient should be altered while balancing the chemical equation.
* Coefficient should be least possible whole numbers.
==> hope this answer is clear and useful to you....
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Atoms of pure elements, that is, atoms not combined with any other element, have an oxidation number of zero. For example, sodium in metallic sodium, Na; oxygen in molecular oxygen, O2; and chlorine in molecular chlorine, Cl2, each have an oxidation number of 0.Monatomic ions have an oxidation number equal to the charge of the ion. Thus, a sodium ion, Na+, has an oxidation number of +1; that of chlorine in a chloride ion, Cl−, is −1.Generally, hydrogen atoms in compounds have an oxidation number of +1; oxygen atoms in compounds are typically −2.The sum of oxidation numbers in a neutral compound is zero. Water, H2O, is an example. Hydrogen: 2 H × (+1/H) = +2; oxygen: 1 O × (−2/O) = −2; (+2) + (−2) = 0The sum of oxidation numbers of the atoms in a polyatomic ion equals the charge on the ion. For example, the sulfate ion, SO4−2, a polyatomic ion, has a net charge of −2. Each oxygen in a sulfate ion has an oxidation number of −2, and four oxygens add up to −8. For the sulfate ion to have a net −2 charge, sulfur must have a +6 oxidation number: −2 = 4(−2) +6.
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