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.Sam.
 2 years ago
Best ResponseYou've already chosen the best response.0Double replacement reaction gives, \[\begin{array}{c} \text{Pb}\left(\text{N}\text{O}_3\right)_2 \\ \end{array} \text{ + } \begin{array}{c} \text{K}_2\text{Cr}\text{O}_4 \\ \end{array} \text{ $\longrightarrow $ } \begin{array}{c} \text{Pb}\text{Cr}\text{O}_4 \\ \end{array} \text{ + } \begin{array}{cc} 2 & \text{K}\text{N}\text{O}_3 \\ \end{array}\] Using ΔH = energy used in bond breaking reactions − energy released in bond making products To find whether the reaction is exothermic or endothermic. ΔH gives exothermic reaction, heat is released from the system. +ΔH gives endothermic reaction beacause heat is being added to break the bonds.
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