1.) temperature change, 2.) color change, 3.) gas formation
Answer
correct answer is C
Head-to-tail method
Here head-to-tail method is employed to determine resultant of vectors.
Let horizontal component be 1 and let vertical component be 2
To add these two vectors. Move vector 2 until its tail touches the head of 1. The tail of resultant of these two vectors touch the tail of vector 1 and head of resultant vector will touch the head of vector 2.
The net force is (40 Newtons) (down the road).
But 40 Newtons is not going to move a piano very enthusiastically.
4.98 kJ/mol would be the answer I believe :) hope this helped
