Which is an example of reversible physical change ? peeling an apple? chopping wood? cutting hair ? melting ice ? now

When 225mg of anthracene, c14h10(s), was burned in a bomb calorimeter the temperature rose by 1.75k. calculate the calorimeter constant. by how much will the temperature rise when 125mg of phenol, c6h5oh(s), is burned in the calorimeter under the same conditions? (δch< (c14h10,s)=–7061 kj mol−1.)

Define a is a tiny pavket of energy

What does the symbol (–hfus) indicate in a phase change?