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CDA- Exam Chapter 9
Thermo retake questions
35
Science
8th Grade
02/20/2010

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Term
Heat is defined as the transfer of`
Definition
thermal energy
Term
T/F - Convection occurs when 2 objects at different temperatures touch each other, and heat flows from the hotter object to the cooler object.
Definition
FALSE
Term
32 degrees F is ______ Kelvin or _____ degrees C.
Definition
273, 0
Term
_______ measures the average kinetic energy of an object's particles.
Definition
temperature
Term
______ measures the total energy of the particles in an object.
Definition
Thermal energy
Term
List the 3 factors that determine the amount of thermal energy in an object
Definition
temperature, mass, specific heat
Term
Heat flow in gases is largely mediated by___.
Definition
radiation
Term
T/F - Air is an excellent conductor of thermal energy.
Definition
FALSE
Term
T/F - The higher the R-value the more effective is the insulating material.
Definition
TRUE
Term
_________ is the branch of physics that deals specifically with the transformation of thermal energy into other forms of energy and into work.
Definition
Thermodynamics
Term
The ________ law of thermodynamics specifies that heat cannot travel from a cold object to a hot object.
Definition
Second
Term
The ______ law of thermodynamics predicts the impossibility of attaining 0 Kelvin.
Definition
Third
Term
The _____ law of thermodynamics restates the Law of Conservation of Energy.
Definition
First
Term
The _________ law of thermodynamics states that 2 systems in thermal equilibrium with a third system are in equilibrium with each other.
Definition
Zeroth
Term
Define specific heat
Definition
The amount of thermal energy in calories needed to raise the temperature of 1 g of a substance 1 °C. (cal/g °C or kcal/kg °C).
Term
Define a (small) calorie
Definition
The amount of thermal energy required to increase the temperature of 1 g of water 1 degree C.
Term
What is a "large" calorie?
Definition
1000 calories; a kilocalorie (kcal).
Term
How many small calories are needed to heat a kg of water from 4 degrees C to 5 degrees C?
Definition
1,000
Term
How many small calories are needed to heat 0.5 liters of water from 4 degrees C to 5 degrees C?
Definition
500
Term
Solids which readily transfer heat energy are called _______.
Definition
thermal conductors
Term
Substances that tend to prevent the transfer of heat energy are called _________.
Definition
thermal insulators
Term
T/F - Ironically, good thermal conductors are generally poor electrical conductors.
Definition
FALSE
Term
_______ is the SI unit for (thermal) energy.
Definition
Joule
Term
Of the Three mechanisms by which heat travels from one object to another, which requires physical contact?
Definition
conduction
Term
The _____ law of thermodynamics is often referred to as the law of entropy.
Definition
Second
Term
T/F - A kcal is the amount of thermal energy needed to raise the temperature of iron, gold and air by 1 degree C.
Definition
FALSE
Term
T/F - A kg of water at 25 degrees C contains more thermal energy than a kg of gold at 25 degrees C.
Definition
TRUE
Term
T/F - Latent ("invisible") heat is the energy released or absorbed during a change of state.
Definition
TRUE
Term
T/F - When water boils more calories are released then when water freezes.
Definition
TRUE
Term
Define entropy.
Definition
The amount of disorder and randomness in a system; unusable energy.
Term
T/F - Thermal equilibrium is reached between two objects when they attain the same specific heat.
Definition
FALSE
Term
Railroad tracks have been known to buckle on unusually hot and sunny days. Explain what causes the tracks to buckle.
Definition
Term
A hypothetical fluid was once believed, albeit wrongly, to be responsible for the production, possession, and transfer of heat was called _________.
Definition
Term
Describe why direct exposure to steam heat causes worse burns then direct exposure to boiling water.
Definition
Because the fusion of heat from the steam on a surface (like a hand) releases more energy than it does as a boiling liquid.
Term
Describe how heat can raise the temperature of a volume of gas.
Definition
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