Heat & Particles
What happens to the average kinetic energy of molecules when an object's temperature increases?
Average
If a hot object touches a cooler one, which direction does thermal energy transfer?
faster
A can of soda has been in a hot car all day. The temperature of the soda has increased, so what has happened to the energy of the molecules of the soda?
the energy/speed has increased
The hotter something is, the slower its molecules move.
False. (they move faster)
When 2 objects reach the same temperature this is called what?
Equilibrium?
In the diagrams from the assessment, molecules are shown with numbers inside circles. What do those numbers represent?
Kinetic Energy?
Temperature is a measure of the average ______________ of the molecules of a thing?
speed
When room temperature water is placed in a refrigerator, it gets colder. Explain what happens.
The energy from the water transferred to the colder air and the temperature of the water decreased
The average for the following set of numbers is 6.
2, 5, 2, 1, 5
False (average is 3)
The following 3 molecules are moving at speeds 1, 2, and 3. What is their temperature?
2
This is otherwise known as the average kinetic energy of a thing...
temperature
When a thing gets ______________, its molecules are moving slower.
colder
If a cup of hot water were placed in an enclosed box at room temperature, where would the energy transfer from and to?
From the cup of hot water to air in the enclosed box
The colder something is, the less kinetic energy it has.
True
What substance takes the least amount of energy to heat up and what substance takes the most amount of energy to heat up when cooking dumplings
sand and water
Describe what the molecules of a hot object do compared to those of a cold object.
infer
When a thing gets hotter, its ______________ are moving faster and have more kinetic energy.
molecules
A hot glass of water (Container A) and a cold glass of water (Container B) were placed together. This is what happened to the temperature of each container to reach equilibrium.
the energy flows from Container A to Container B until they reach equilibrium
If object A has 500 Kj of energy and object B has 300 Kj of energy then when they touch energy will transfer from object A to object B.
True
The following 5 molecules are moving at speeds 1, 4, 2, 1, and 2. What is their thermal energy?
2
Using the assessment idea of "molecules with numbers", explain why two identical-size objects at different average molecular energies will exchange energy until they reach the same temperature.
molecule
Temperature is a measure of the average ______________ of the molecules of a thing.
kinetic energy
When you calculate the average speed of the molecules of a substance, you get the temperature of the substance. How do you find the temperature of a substance?
Get the sum of a set of number by adding them together and dividing by the number of sets
In order for substances to reach equilibrium, both of the objects have to transfer temperatures back and forth.
false (Hot substances transfer to colder)
The amount of thermal energy an object has depends on?
The kinetic energy and amount of molecules an object has