explain any two properties of chemical reaction with example
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1)Reactants are not retained a1md give out a new compound/element
2Mg+O2-->2MgO
2)The rate and products of chemical reaction can be altered by catalysts
NaCl +H2SO4-->NahSO4 + HCl
where temperature is below 200℃
whereas they produce Na2SO4 when temperature is above 200℃
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