Energy and Specific Heat
Which statements are true concerning a substance with a high specific heat?
-The substance cools down slowly after heating. -An example substance is water.
Suppose you heat a metal object with a mass of 32.1 g to 96.1 oC and transfer it to a calorimeter containing 100.0 g of water at 18.5 oC. The water and metal reach a final temperature of 23.2 oC. What is the specific heat of the metal in J/g-oC?
0.841
What is the value of 104 calories in joules (J)?
435.1
Suppose you mix 100.0 g of water at 21.3 oC with 75.0 g of water at 76.4 oC. What will be the final temperature of the mixed water, in oC?
44.9
In the Energy and Specific Heat lab, you measure the temperature change of water to study the specific heat of a metal. What statement explains the relationship between the water and the metal you are studying?
The heat lost by the metal is equal to the heat gained by the water.
Specific heat is the heat required to raise the temperature of 1 g of a substance by 1 oC. Based on this definition, what is the equation to calculate specific heat?
specific heat = heat / (mass x change in temperature)
What action is NOT necessary before lighting a Bunsen burner?
Leave the gas cock open for a few minutes before lighting to clear the line.
Identify the term that matches each description. Energy that is transferred from one object to another_____________ A measure of the amount of thermal energy in an object _______________ The energy needed to raise the temperature of 1 gram of a substance by 1°C __________________________
heat temperature specific heat
Identify the necessary parts to build a calorimeter.
thermometer interior Styrofoam cup cover exterior Styrofoam cup
The Law of Conservation of Energy states that ___________________. An example of the law in this laboratory is __________________
no energy can be created or destroyed, only transferred or transformed. the water in a calorimeter absorbing heat given off by a reaction or hot object.
In the Energy and Specific Heat lab, what temperature should be recorded as the final temperature of the water when measuring the food sample?
The highest temperature the water reaches as the sample burns