Specific Heat Capacity

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Heat Capacity and Specific Heat Capacity

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Presentation transcript:

Specific Heat Capacity Comparing different types of matter!

Specific Heat Capacity Compares how easily the kinetic energy of particles is changed for different materials Symbol is c Definition: Amount of heat needed to raise the temperature of 1 kg of a material 1oC or 1K

Specific Heat Measured with calorimeter

Change in Thermal Energy Thermal energy changes if heat flows into or out of a material Change in thermal energy = mass x change in temperature x specific heat Q = m c ΔT

Math Skills Activity p 162 The temperature of a 32 g silver spoon increases from 20oC to 60oC. If silver has a specific heat of 235 J/kgK, what is the change in thermal energy? What we know: Mass=32g = ? Kg Starting temperature: 20oC Ending temperature: 60oC Specific heat (c ) = 235 J/kgK Change in temperature: Ending temperature – starting temperature ΔT = 60oC – 20oC = 40oC = ? K

Math Skills Activity continued Equation: Q= m c ΔT Put values in: Q = (0.032 kg) ( 235 J/kgK) (40 K) Solve! Q = 300.8 J

Practice! Do the practice problem on page 162.

Another problem: What is the amount of heat energy that must be removed to lower the temperature of 200 g of water from 24oC to 20oC?