Show:
Temperature
Heat
Heat pt 2
Conservation of Energy
Misc
100
Temperature is the measure of the _______
the average kinetic energy of the particles in a substance
100
Heat is the measure of _______
the energy transferred between substances based upon how hot or cold they are
100
Conduction can be defined as _______
the transfer of energy through the collision of neighboring particles
100
When a hammer is used to drive a nail into a block of wood, a portion of the kinetic energy from the hammer is transferred into the _________ energy of the hammer and nail
INTERNAL energy (U)
100
True or False: Every substance has the same specific heat capactiy
FALSE: every substance has a different heat capacity because it is dependent on the particles that a substance is composed of and how they interact
200
When are two substances at thermal equilibrium
When they have the same temperature
200
The SI unit for heat is the ___
Joule
200
How does conduction allow the handle of a hot pan to become hot when the pan is left on a hot stove for a period of time?
The molecules in the bottom of the pan begin to vibrate due to the heat transferred into the pan from the stove. This vibration travels throughout the pan as the neighboring particles in the pan collide with on another. Eventually, the vibration will reach the handle of the pan, thereby increasing its temperature.
200
Why is it important to wear multiple layers on a cold day?
The air between the layers of clothing acts as an insulator to trap your heat.
200
Consider equal masses of water and air. If we add 100 J of heat energy to the water and air, the air's temperature will increase MORE than the water's temperature. Therefore, which will have a greater specific heat capacity? EXPLAIN
Water will have a greater specific heat capacity. This is because the water has a smaller change in temperature, meaning it has a higher CAPACITY to withstand a certain amount of energy without its temperature changing by a large amount.
300
Convert the following into Celsius and Kelvin: 125 degrees F
What is 51.67 degrees C; 324.82 kelvin
300
Heat is always transferred from ____ to ____
HOT; COLD
300
Why does a cement floor feel cold whereas a carpet feels warmer to your bare feet?
The cement is a better conductor of heat, whereas the carpet is a poor conductor (it is a good insulator). Therefore, the heat from your body will be more readily transferred to the cement, causing the cement to feel cold.
300
Explain why fluffing up a down sleeping bag can keep you warm at night
By fluffing up a down sleeping bag, more air will be put into the sleeping bag. Since air acts as an insulator, having more air in the sleeping bag will decrease the amount of heat from your body that could be lost.
300
If a small candle and a large heater have the same temperature, which has more internal energy (more heat energy)? EXPLAIN
The heater because it has more mass.
400
A substance increases its temperature, therefore the volume of that substance will (increase/decrease). What concept does this refer to?
Increases; Thermal Expansion
400
For the following scenarios, which will undergo a larger heat transfer? EXPLAIN a. a bottle of fruit juice at room temperature is placed in a freezer b. a partially frozen bag of carrots is placed in the same freezer
A there is a larger temperature difference
400
Why does a cup of hot coffee cool down FASTER when you blow on it?
By blowing onto the coffee, you increase the rate at which heat is transferred from the coffee to the cold air.
400
The boiling point for aluminum is 2467 degrees C. The melting point is 3251.9 degrees F below the boiling point. Find the melting point and boiling point in degrees F.
MP = 1220.74 degrees F BP = 4472.6 degrees F
400
Why does the temperature of melting ice not change even though energy is being transferred as heat to the ice?
Energy is used to break bonds between molecules in ice. There is a change in PE not KE.