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Transcript of Specific Heat
Specific Heat (Cp)
The ability of a substance to absorb heat (Heat Capacity)
The specific heat of a substance is the number of calories needed to raise the temperature of one gram of the substance one degree Celsius.
The units of Specific Heat are - calories per gram Celsius degree
cal/g°C or J/g°C
The unit of heat.
The amount of heat needed to raise the temperature of one gram of water one degree Celsius.
A "Food Calorie" is 1000 calories (Cal), or a Kilocalorie
Heat gained or lost = (mass) (change in Temp) (specific heat)
S.I. unit of energy = joule (J)
Heat and work ( energy in transit) is measured in joules
Q = (-) releases heat
Q = (+) absorbs heat
Table of Contents
Date Lecture/Activity Pg#
83 04/22/15 Specific Heat 140
I will record notes on how to use thermochemical equations to calculate energy changes that occur in chemical reactions and classify them as exothermic or endothermic
Several people are stranded on a cold, remote, deserted island with only the clothes on their backs. They must stay warm and purify some water to drink. One of the first task they all agree on is to try to build a fire.
1. How could the surviviors go about starting a fire?
2. What is fire? Describe it.
3. What makes fire hot?
Calculate the energy required to heat a beaker of water at 18 °C to boiling. The mass of the water is 70.0 g. (Cpwater = 4.184J/g°C)
A silver ring has a mass of 138.45 g. How many calories of heat are required to increase the temperature from 11.8 °C to 162.5 °C? (Cpsilver = 0.24J/g°C)
A 15.75-g piece of iron absorbs 1086.75 joules of heat energy, and its temperature changes from 25°C to 175°C. Calculate the specific heat capacity of iron.
How many grams of aluminum will absorb 297 joules of heat when there is a temperature change from 22°C to 55°C, the specific heat of aluminum is 0.90 J/g°C?
Specific Heat Observations
1. Obtain the specific heat wand.
2. Add a small piece of wax to each end of the wand.
3. Set up your bunsen burners. (Be careful with open flames)
4. Place wand above the flame.
5. Observe the order in which the wax melts and record in your notebooks.
6. Write a statement regarding the specific heats of the metals on the wand.