You heat two substances, A and B. Both substances change color. When cooled, substance A returns to its original color, but subs
tance B does not. What most likely happened in this situation? A chemical change occurred in both substances. A physical change occurred in substance A, and a chemical change occurred in substance B. A physical change occurred in both substances. A chemical change occurred in substance A, and a physical change occurred in substance B.
The reason why A returned to its original color but B did not is because; A chemical change occurred in substance A, and a physical change occurred in substance B.
A chemical change results in a change in the "composition" of a substance. When the composition of the substance changes, the change is often irreversible.
A physical change does not alter the composition of a substance hence a physical change is easily reversible.
Since A did not return to its former color, it underwent a chemical change while B underwent a physical change since it returned to its former color.
Specific heat is the amount of heat per unit mass required to rise the temperature of a substance by one degree celsius.It is expressed in units of thermal energy per degree temperature.A calorimeter is used when measuring the heat capacity of a reaction.Molar heat capacity is amount of heat required to raise the temperature of a substance by one degree Celsius.
