a puddle evaporating = physical change
adding food coloring to water = chemical change
cutting an apple = physical change
denting a piece of metal = physical change
dry ice sublimating = I think is chemical change
iron rusting = chemical change
limewater and carbon dioxide forming chalk = chemical change
water boiling = physical change
vinegar and baking soda making bubbles = chemical change
paper burning = chemical change
Your welcome. I do sincerely believe that these are correct.
When water freezes to form ice, the molecules would be vibrating in place rather than moving round. It is a result of a decrease in the kinetic energy of the molecules of water. It is said that the temperature and the kinetic energy of the molecules is directly proportional which means that when temperature is increased, the kinetic energy of the molecules would increase as well making the molecules move around. However for this case, when we day the system is cooled then it means the temperature is decreased which would result to the decrease of the kinetic energy of the molecules.
The physical state of water at the following temperatures are :
- 125° C = Gaseous state (Steam)
- -24° C = Solid state (Ice)