Activity 3 Directions From the given activities below, identify which shows physical change or chemical change by writing your answers using the table below as a guide Fringe Boiling water Burning paper Grilling chicken Melting chocolate Drying of wet clothes Heating of white sugar Melting of cone ice cream Drying fishes under the sun Drying wet palay under the sun Physical change through the application of heat Chemical change through the application of heat 5

The heater element of a 120 v toaster is a 5.4 m length of nichrome wire, whose diameter is 0.48 mm. the resistivity of nichrome at the operating temperature of the toaster is 1.3 × 10-6 ω·m. the toaster is operated at a voltage of 120 v. (a) what is the power drawn by the toaster? (b) if the cost of electricity is 12 ¢ per kilowatt-hour, and it takes 2 minutes to toast bread, how much does it cost for toasted bread? (c) when the heater element is at room temperature, is the resistivity in the nichrome wire greater than, less than, or equal to it’s resistivity when at operating temperature? explain.