Properties of Matter Specific Heat. Couple of Terms: Heat may be defined as energy in transit from a high temperature object to a lower temperature object.

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Presentation transcript:

Properties of Matter Specific Heat

Couple of Terms: Heat may be defined as energy in transit from a high temperature object to a lower temperature object.

Specific Heat Couple of Terms Temperature is a measure of the average kinetic energy associated with the disordered microscopic motion of atoms and molecules.

Specific Heat Couple of Terms: A calorie is a unit of measurement for energy.

Specific Heat The specific heat is the amount of heat per unit mass required to raise the temperature by one degree Celsius.

Specific Heat The relationship between heat and temperature change is usually expressed as: Q = cm  T where c is the specific heat m is the mass  T is the change in temperature and Q is the heat added

Specific Heat This relationship does not apply if a phase change is encountered, because the heat added or removed during a phase change does not change the temperature.

Specific Heat The specific heat of water is 1 calorie/g °C

Specific Heat Now a Lab!

Heat of Fusion The energy required to change a gram of a substance from the solid to the liquid state without changing its temperature. For Ice to water it’s 80 cal/g

Heat of Vaporization The energy required to change a gram of a liquid into the gaseous state at the boiling point. For water to steam it’s 540cal/g

Specific Heat Calculations…… The specific heat of water is 1 c/g The specific heat of Steam is 0.48 c/g The specific heat of Ice is 0.50 c/g

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