Which indicator of a chemical reaction is shown in the picture?
the formation of a gas
the formation of a precipitate
a change in energy

i think it’s a. this is because if they measured the mass of something with a mass of 150g, then their final answer would have to be approximately 150g. though all of their answers are almost 150, rosa and tran have the closest answers (or the exact answer) to the accurate one.

where is the circuit diagram ?

when heated, the valance electrons increased their speed and transferred the heat from electron to electron.   i just took the test.