Question

explain what happens to the molecules of a substance which is heated?​

Answer 1

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.

Answer 2

When molecules of a substance are heated, it expands.

• When molecules of a substance are heated, it expands and moves faster.
• If the substance is in its solid form, it will convert into liquid form.
• When the surface of a liquid substance gets hotter and hotter and reaches its boiling point, it evaporates in the form of vapor and converts into a gaseous form.
• The process of conversion of a substance from its liquid form to a gaseous form is called evaporation.