7.1 Woodstoves - Observations about Woodstoves Key Concepts...

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1 Key Concepts: 1. Heat & Temperature 2. Heat Transfer Conduction Convection Radiation 3. Specific Heat Observations about Woodstoves They burn wood inside closed fireboxes They often have long chimney pipes They are usually black You get burned if you touch them Heat rises off their surfaces It feels hot to stand near them Clicker Question 1 Which is more effective at heating a room: a) a black woodstove b) a shiny chrome-plated woodstove Question 1 What are thermal energy and heat? Having Thermal Energy Thermal energy is disordered energy within an object kinetic and potential energies of atoms is responsible for temperature Thermal energy doesn t include order energies kinetic energy of an object moving or rotating potential energy of outside interactions Temperature Hot gas Cold gas
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2 Transferring Heat Heat is energy that flows between objects because of their difference in temperature thermal energy on the move Technically, objects don t contain heat Temperature Really only tells you which way heat will flow. heat Question 2 How does a woodstove produce thermal energy? Burning Wood Fire releases chemical potential energy Wood and air consist of molecules Molecules are bound by chemical bonds When bonds rearrange, they can release energy Burning rearranges bonds and releases energy! Chemical Forces and Bonds Atoms interact via electromagnetic forces The chemical forces between two atoms are attractive at long distances repulsive at short distances zero at a specific equilibrium separation Atoms at the equilibrium separation are in a stable equilibrium and are bound together by an energy deficit A Few Names Molecule: atoms joined by chemical bonds Chemical bond: a chemical-force linkage Bond strength: the work needed to break bond Reactants: starting molecules Reaction products: ending molecules
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