11. Cast-iron skillets take longer to heat up than copper ones, but they hold their heat longer. Why? Copper and iron have the same specific heat. Copper has a higher specific heat than iron. Iron has a higher specific heat than copper.21. What particles exist within plasma that do not exist in all elements in other states? free electrons molecules atoms free neutrons
11. Specific heat of copper = 385 J/(kg K) Specific heat of cast iron (just iron) = 450 J/(kg K) Iron has a higher specific heat than copper. It takes more energy to heat up the iron than it does the copper. So, if you have an electric stove and it puts out the same amount of power for the burners, then it will take longer to heat up the cast iron skillet. Same idea with the cool down too. The environment has to pull more energy from the cast iron skillet than it does the copper one to cool it down. If the rate of energy absorbtion (heat transfer) is the same for both, then it will take more time for the iron. 21) Free electrons. This comes from the basic definition of plasma... ionized particles. Ions do not have the protron/electron balance.
This is a matter of heat capacity. The ability to retain heat is ultimately related to the molecular structure of the material. Cast iron has a structure of iron crystals and amorphous carbon atoms, copper has a very regular crystal structure. Because cast iron has a less organized structure it takes more energy to to vibrate the individual atoms and once set in motion they retain their energy for longer because the atomic structure doesn't conduct heat very well.
