Topic#33: Introduction to Thermochemistry

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Presentation transcript:

Topic#33: Introduction to Thermochemistry EQ: What is the difference between heat and temperature?

Predictions What will happen to the water temperature in each beaker on the hot plate? Why? What are three the types of heat transfer? How are they demonstrated? Assuming I leave the beakers on the hot plates long enough, what will happen? What will be the same in the two beakers? What differences will you observe between the two beakers?

Types of Heat transfer Conduction is the transfer of heat energy between substances that are in direct contact with each other. Convection occurs when areas of a liquid or gas at different temperatures rise and fall to due to density differences. Radiation does not rely upon any contact between the heat source and heated material, as is the case with conduction and convection.

Recall… What is the law of conservation of energy? List the forms of energy you know about. Give an example for each form.

Water boiling… What temperature is the water at? Are we still adding more heat? Why isn’t the temperature increasing?

Turning off the hot plates… What comparisons can you make about the water temperature and amount of heat energy in each beaker of water at boiling? Was the same thing true of the beakers of water at room temperature before I started heating them? So, what is the difference between heat and temperature? Use the words kinetic energy and water molecules. How long will the transfer of energy take place between two quantities of matter?

Conclusions… Heat and temperature are not the same. Heat, symbolized by Q, is the energy transferred as a result of a temperature difference. Temperature, T, is the measure of the average kinetic energy of particles within a material. Heat energy transfers from matter at higher temperature to matter at a lower temperature, mostly by conduction and convection.

This photo demonstrates the 3 types of heat transfer. Describe them.