Specific Heat Pre – Lab. Specific Heat Different substances require different amounts of heat to change their temperature. In general the specific heat.

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Presentation transcript:

Specific Heat Pre – Lab

Specific Heat Different substances require different amounts of heat to change their temperature. In general the specific heat of a substance indicates how hard something is to heat up or cool down. Scientifically speaking the specific heat is the amount of heat required to change the temperature of 1 gram of a substance by 1ºC.

Which substance is the hardest to heat up or cool down?

Sample Problem 1 A 70.00g sample of metal is heated to 80.0  C and placed in g of water at 22.0  C in a styrofoam cup. The temperature of the water in the cup rises to 26.4  C as the metal cools. Determine the specific heat of the metal.

Sample Problem 1 A 70.00g sample of metal is heated to 80.0  C and placed in g of water at 22.0  C in a styrofoam cup. The temperature of the water in the cup rises to 26.4  C as the metal cools. Determine the specific heat of the metal. What three things must we determine to find the specific heat? Look at the units for specific heat

Sample Problem 1 A 70.00g sample of metal is heated to 80.0  C and placed in g of water at 22.0  C in a styrofoam cup. The temperature of the water in the cup rises to 26.4  C as the metal cools. Determine the specific heat of the metal. What three things must we determine to find the specific heat? Look at the units for specific heat J/g °C Joules (Energy) Grams (mass) °C (temperature change)

Sample Problem 1 A 70.00g sample of metal is heated to 80.0  C and placed in g of water at 22.0  C in a styrofoam cup. The temperature of the water in the cup rises to 26.4  C as the metal cools. Determine the specific heat of the metal. Mass of metal = 70.00g∆T of metal = 53.6°C Heat gained by water = (mass of water)(  T of water)(Cp of water) Heat = (100.00g)(4.4°C)(4.184 J/g  C) = J = 1800J Heat gained by the water = Heat lost by the metal To find specific heat remember the units: C p = J/g ·°C

Sample Problem 2 Calculate the percent error, of this measurement if the true value for the specific heat of the metal is 0.50 J/g  C.

Sample Problem 2 Calculate the percent error, of this measurement if the true value for the specific heat of the metal is 0.50 J/g  C.

Sample Problem 2 Calculate the percent error, of this measurement if the true value for the specific heat of the metal is 0.50 J/g  C.

Sample Problem 3a A 45.00g sample of metal is heated to 98.0  C and placed in g of water at 21.0  C in a styrofoam cup. The temperature of the water in the cup rises to 24.0  C as the metal cools. (a) Determine the specific heat of the metal.

Sample Problem 3a A 45.00g sample of metal is heated to 98.0  C and placed in g of water at 21.0  C in a styrofoam cup. The temperature of the water in the cup rises to 24.0  C as the metal cools. (a) Determine the specific heat of the metal. Heat gained by water = (mass of water)(  T of water)(Cp of water) Heat gained by the water = Heat lost by the metal Heat = (100.00g)(3.0°C)(4.184 J/g  C) = J = 1300J C o p g J 39.0 Cg J = C)74.0( (45.00g 1300J T xm H = metal of C  )    

Sample Problem 3b Calculate the percent error, of this measurement if the true value for the specific heat of the metal is 0.34 J/g  C.

Homework Lab Summary for Specific Heat of a Metal