Which direct measurement would provide evidence that the energy of a substance had changed?
A. temperature
B. heat
C. mass
D. volume
I think the answer is a or b
I think the answer is A. I would choose heat, also, but T measures heat. And choosing heat means ONLY heat would be evidence but CHANGE in T is what counts; i.e., it could get colder or hotter and be evidence that a change in energy had occurred. So temperature I think is the right answer.
You are correct, the answer is indeed A. temperature or B. heat. Both temperature and heat are direct measurements that can provide evidence of a change in the energy of a substance. Temperature is a measure of the average kinetic energy of the particles in a substance, while heat is the transfer of energy between two objects due to a temperature difference. Therefore, changes in temperature or the amount of heat can indicate a change in the energy of a substance.
To determine which direct measurement would provide evidence that the energy of a substance had changed, we need to consider the definitions and properties of each measurement option.
A. Temperature: Temperature is a measure of the average kinetic energy of the particles in a substance. A change in energy can result in a change in temperature. Therefore, changes in temperature can provide evidence of a change in energy.
B. Heat: Heat is the transfer of energy between substances due to a temperature difference. It is not a direct measurement of energy itself, but rather a process by which energy is transferred. While changes in heat can be associated with changes in energy, it is not a direct measurement of energy change.
C. Mass: Mass is a measurement of the quantity of matter in a substance and is unrelated to the energy of the substance. It does not provide evidence of an energy change.
D. Volume: Volume is the amount of space occupied by a substance. Similar to mass, it is unrelated to the energy of the substance and does not provide evidence of an energy change.
Based on the explanations above, the correct answer is A. temperature. The change in temperature can directly indicate a change in energy.