Unformatted text preview: icates that the particles of the liquid are in constant motion
and through collisions push the dye throughout the liquid in the beaker. The particles of a liquid are not
held together as tightly as the particles of a solid. To change the temperature of a liquid, heat energy must
be added. The amount of heat energy that changes the temperature of 1.0 g of a liquid by 1.0°C is called its
specific heat (c). Each liquid has its own specific heat. The specific heat of water(l) is
4.2 Joules/g°C. In other words we must supply 1.0 gram of water with 4.2 Joules of heat energy to raise
its temperature by 1.0 °C.
The general equation for calculating heat energy to change the temperature of a liquid is:
Heat = Mass x Specific Heat (liquid) x Temperature Change
Q = m c DT
H2O(s) at -20°C B-C H2O(l) at 0°C H2O(s) at 0 °C 10 g C-D
10 g D-E
H2O(l) at 100°C 10 g E-F
H2O(g) at 100°C H2O(g) at 140°C 10 g 10g 10 g Calculate the heat necessary to change 10 g of H2O(l) at 0 °C to 10 g of H2O(l) at 100°C. (C-D). Q = mc∆T...
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This document was uploaded on 01/20/2014.
- Winter '14