Question

based on relative bond strengths, classify these reactions as endothermic (energy absorbed) or exothermic (energy released)
endothermic
B2+C2-->2BC
A+BC-->AB+C

exothermic
AB+C-->AC+B
A2+C2-->2AC
A2+B2-->2AB

Answer 1

i had this question before

Answer 2

can you send me your link?

Answer 3

okay hold on one second

Answer 4

based on relative bond strengths, classify these reactions as endothermic (energy absorbed) or exothermic (energy released)
endothermic
B2+C2-->2BC
A+BC-->AB+C

exothermic
AB+C-->AC+B
A2+C2-->2AC
A2+B2-->2AB

Answer 5

Not quite sure if the following is correct.

For exothermic reaction, the bond of the product(s) is stronger than that of the reactant(s). For endothermic reaction, it is the opposite. Since you are given a table of bond strength, you can compare them using the table and deduce if it is an exothermic reaction or an endothermic reaction.

Take the first equation as an example.
B2+C2-->2BC
For the reactant side, we have B2 and C2, for the product side, we have BC. Note that the bonds of B2 and C2 are both stronger than that of BC, i.e. we have B2 + C2 > BC in terms of bond strength. So, it is an endothermic reaction.

If the above example is correct, you can work out the rest using similar logic. Good luck!