Heat Transfers
What heat transfer occurs when you accidentally burn your hand on a curling iron? (conduction, convection, or radiation)
If the kinetic energy of molecules increases, what would happen to the temperature of the object?
The temperature will increase too
How does heat travel?
From hot to cold
What is the definition of Conduction?
The heat transfer through direct contact.
When comparing two cups of water, one cup is sitting outside on a hot day and the other cup is sitting in a shaded area outside. The cup that is sitting outside without shade will have __________(more or less) kinetic energy than the cup sitting in the shade
More
What heat transfer occurs when you get a sunburn on a hot day? (conduction, convection, or radiation)
Radiation
Which two phase changes have kinetic energy increasing the most?
Solid to liquid, Liquid to solid, Gas to liquid, & Solid to gas
solid to liquid and solid to gas
What does it mean to say a system has reached thermal equilibrium?
All objects have the same temperature.
What is the definition of convection?
The heat transfer that occurs when the warm fluid rises and the cooler fluid sinks.
If a hot plate of food has been sitting out overnight, what will ultimately happen to the food's temperature and kinetic energy?
The food's temperature will be equal to the room temperature and the kinetic energy of the moles in the food will decrease as time moves on.
The tectonic plates in the mantle move, because of the rising of the hot magma rocks and falling of the cool rocks making a current. What heat transfer is occuring?
The tectonic plates in the mantle move, because of the rising of the hot magma rocks and falling of the cool rocks making a current. What heat transfer is occuring?
A cup of hot water is sitting on a table. Over time, the water's temperature is decreasing. What is happening with the kinetic energy of the molecules in the water?
The kinetic energy is decreasing as well.
A hot cube's temperature is 100 C and a cold cube's temperature is 0 C. The cubes are touching, what would the temperature be once it reaches thermal equilibrium?
50 C, because the hot travels to the cold cube until thermal equilibrium is reached internally.
Warming your hands up by a campfire is an example of what kind of heat transfer?
Radiation
The rising of hot molecules and sinking of cold molecules are represented by ______________ currents.
Convection
Explain how a person touching the hot handle of a pot of water hovering over a campfire heats up using conduction, convection, and radiation.
A student has a beaker of room temperature water. They pour boiling water into the room temperature water. What will happen to the kinetic energy of the water?
The kinetic energy of the molecules will increase, because the temperature will increase since they added boiling water to room temperature water.
Two objects at 40°C and 20°C are touching. What temperature would the blocks be at equilibrium?
30 C
Why is the second story of a home warmer than the first story? What heat transfer is this an example of?
Heat rises and cold sinks, and this is because of convection.
Fill in the blanks with the most appropriate words: Marta wants to investigate how energy is transferred in the oceans. She has a tub filled with cold water and adds thermal energy to the bottom on one side. In order to determine how energy is transferred, she should measure the ______________of the water at different locations in the tub because thermal energy is transferred through ________________.
Temperature and convection
Explain why the inside of a car gets very hot on a sunny day, and what types of heat transfer are at work.
Radiation from the sun heats the car's interior, and the trapped heat warms the air through convection.
Two containers hold the same gas at different temperatures. In which container do the gas particles have greater average kinetic energy, and why?
The container with the gas that has the higher temperature.
A cup of warm coffee at 100 ℃ was sitting out on a table for an entire day. The temperature of the house is 24℃. What would the temperature of the cup of coffee be at the end of the day? How do you know?
24 c, because it will reach the same temperature of the room if it's been sitting out for a long period of time.
If you put your hand in a pot of boiling water and your hand gets burnt, what type of heat transfer occurred? What happens to the kinetic energy of the molecules in this case?
Conduction. The boiling water transfers heat to your hand, which increases the kinetic energy of the molecules in your skin.
Fill in the blanks with the correct heat transfer.
A lightbulb causing a lampshade to get hot is an example of ____________. The ocean transferring thermal energy from place to place is an example of _____________ Getting out of bed and leaving the spot you were laying warm is an example of ___________.
Radiation, Convection, and Conduction.