Specific Heat Pre – Lab. “Flying Freddie Spooner” 2013 Tri-Valley Cannonball Champion.

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Presentation transcript:

Specific Heat Pre – Lab

“Flying Freddie Spooner” 2013 Tri-Valley Cannonball Champion

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?

Importance of Water’s High Specific Heat Maintenance of Body Temperature

Importance of Water’s High Specific Heat Temperature fluctuations that permit life.

Importance of Water’s High Specific Heat Heat Storage on a Larger Scale.

Today you will determine the specific heat of a metal.

How can we determine experimentally the specific heat of this metal? Lead

Look to the units. They will lead you to the answer.

J/g °C We must determine three things to find the specific heat? Joules (Energy) Grams (mass) °C (temperature change)

What measurements of this metal are needed to find it’s specific heat? Lead

Hidden Slide Heat cannot be measured. Heat must be calculated

H = mΔTC p

Today you will use the high specific heat capacity of water to help us determine the specific heat of a metal. How will we do this?

°C

.

How Do We Use the Measurements Below to Determine the Specific Heat of the Metal? 100.0°C

H = mΔTC p 100.0°C p H Metal’s

H water = mΔTC p = (50.00g)(6.8°C)(4.184 J/g  C) = J = 1400J 100.0°C What does this answer represent?

H water = H metal = 1400J We can now find the Cp of the metal 100.0°C

Calculate the “Percent Error” of our specific heat measurement.

Percentage Error

You will experimentally determine the specific heat of Aluminum 0.90