Question

If a substance is hot, its particles will move :

• A. more faster than the cooler object
• B. more slower than the cooling object
• C. at the same rate as the cooler object
• D. none of the above

Answer 1

The correct option is A more faster than the cooler object

When heat is added to a substance, the molecules and atoms vibrate faster. As atoms vibrate faster, the space between atoms increases. The motion and spacing of the particles determines the state of matter of the substance. The end result of increased molecular motion is that the object expands and takes up more space.

Mass of the object remains the same, however. Solids, liquids and gases all expand when heat is added. When heat leaves all substances, the molecules vibrate slower. The atoms can get closer which results in the matter contracting. Again, the mass is not changed.