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HMB203H1 (4)
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Chapter 4

Chemistry Chapter Four.doc

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Human Biology

Chemistry Chapter FourChemical Reactions and Chemical EquationsA chemical reaction is a process in which one set of substances reactants is converted to a new set of substances products The main evidences that prove that a chemical reaction has occurred areaColour changebFormation of a solid precipitate within a clear solutioncEvolution of a gasdEvolution or absorption of heatTo write the shorthand representation of a chemical equation certain steps must be followed Consider the chemical reaction nitrogen monoxideoxygennitrogen dioxide1Write the reaction using chemical symbolsNOONO222Balance the chemical equation2NO1O22 NO2 Balancing equationsRemember these rules when balancing an equation1An equation can be balanced only by adjusting the coefficients of formulas2Never introduce extraneous atoms to balanceNOONOO223Never change a formula for the purpose of balancing an equationNOONO23When balancing equations using these strategies will result in efficient balancing of chemical equationsBalance elements that occur in only one compound of each side firstBalance free elements lastBalance unchanged polyatomics or other groups of atoms as groupsFractional coefficients are acceptable and can be cleared at the end by multiplication
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