Question

which word best describes a substance where its atoms and molecules are moving very fast?
porous
frozen
hot
cold
question 3
1 pts
what is heat energy indirectly measured by?
kinetics
recording the motion of molecules
temperature

Explanation:

• For the first question: In a hot substance, the atoms and molecules have high kinetic energy and move very fast. In a frozen (solid - low temperature) substance, molecules have limited movement. A cold substance also has slower - moving molecules compared to a hot one. Porous refers to the presence of pores (spaces) in a material, not related to molecular motion speed.
• For the second question: Temperature is a measure that is related to the average kinetic energy of the molecules in a substance. Heat energy is related to the total kinetic energy of the molecules. We cannot directly measure the total kinetic energy of all molecules (recording the motion of all molecules is not practical), but we can measure temperature which gives an indication of the average kinetic energy and thus indirectly relates to heat energy. Kinetics is a general term related to motion and change, not a direct measurement of heat energy.

Answer:

• First question: hot
• Second question: temperature