Double-replacement
cola
combustion
An exothermic chemical reaction.
associative property
No. A times B = AB
x2+bx+ax+ab = x2+ax+bx+ab = x(x+a)+b(x+a) = (x+a)(x+b)
30 + ab + 6b + 5a = 5(a+6) + b(a+6) = (b+5)(a+6)
I suppose that you think to synthesis reaction.
This kind of chemical reaction is usually called "displacement" and sometimes "substitution".
Double replacement
AB pos or AB neg
An exothermic chemical reaction.
Synthesis reaction A+B=AB
needing sum helo here
When many were taught chemistry in the 1970s this was called a double decomposition reaction. It is now called a salt metathesis reaction and also double displacement reaction. There are examples and more information at the related link.
Single replacement
No, It is is a double replacement. AB +CD = AC + BD
This would be a synthesis reaction. General formula A + B yields AB.
This equation represents an elementary example of a synthesis type reaction. The formula for this reaction is A + B = AB, where A & B are reactants and AB is the product.