The general form for a double-displacement reaction is AB + CD -> AD + CB, where two compounds swap anions or cations to form two new compounds.
The general equation for an endothermic double replacement reaction is: AB + CD → AD + CB + heat absorbed. In this reaction, the reactants AB and CD exchange ions to form the products AD and CB, with the absorption of heat from the surroundings.
Ad < dbad < cbad + dc = cbDC + CB = DBAD < CB
If bd ≠ 0, then a/b + c/d (the common denominator is bd) = (a x d)/(b x d) + (c x b)/(d x b) = ad/bd + cb/db = ad/bd + cb/bd = (ad + cb)/ bd
AB + CD ==> AD + CB
The general equation is:AB + CD = AD + CB
Double replacement
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The difference of two rational numbers is rational. Let the two rational numbers be a/b and c/d, where a, b, c, and d are integers. Any rational number can be represented this way. Their difference is a/b-c/d = ad/bd-cb/bd = (ad-cb)/bd. Products and differences of integers are always integers. This means that ad-cb is an integer, and so is bd. Thus, (ad-cb)/bd is a rational number (since it is the ratio of two integers). This is equivalent to the difference of the original two rational numbers.
General format= AC + CD -> AD + CB
Ab+cd > ad+cb. A and c are the metals or the positive ion
If both fractions are made up of positive integers then the easiest method is to cross-multiply.If you want to compare A/B and C/Dlook at AD and CBIf AD > CB then the fraction with A in it ie A/B is bigger.If CB > AD then the fraction with C in it ie C/D is bigger.If AD = BC, the two fractions are equal.