Phase Descriptors
The phase where molecules are able to move around each other.
What is a liquid.
In order to change the temperature of an object the first thing that must be done is transferring in or transferring out this kind of energy.
What is thermal energy.
When adding or taking away thermal energy, these two qualities of the molecules are in a "tug-of-war" to determine whether or not a substance will change phase.
What is kinetic energy and (inter)molecular attraction.
When a substance undergoes phase change, this is what is changing about the substance's molecules.
What is their movement (freedom of movement).
The temperature at which a substance melts is called.
What is melting point.
The phase where molecules have the least freedom of movement.
What is a solid.
The transferring in or out of thermal energy affects what aspect of a substance's molecules.
What is kinetic energy.
When the intermolecular attraction is weak, does it require more or less energy to be transferred in to increase the molecules freedom of movement (to go from solid, to liquid, to gas).
It requires less energy to be transferred in.
Energy always flows in this direction (HINT: think in terms of high-energy and low-energy).
From high to low.
The word used to describe the temperature at which a substance burns
What is flash point.
This phase can be a lot of shapes. It takes the shape of the container.
What is a liquid.
The amount of molecules in a substance affect how quickly a substance's temperature can rise. Another word to describe the amount of molecules a substance is its...
What is mass.
When a substance has a strong intermolecular attraction, does it requires more or less energy transferred out to decrease the freedom of movement (to go from gas, to liquid, to solid).
It requires less energy to be transferred out.
Hmm, I just noticed liquid water droplets on the outside of my glass of ice cold lemonade. The liquid water droplets came from where?
Water vapor in the air condensing onto the cold glass.
The measurement of average amount kinetic energy of all the molecules in a substance is called this.
What is temperature
The reason why gases can not be seen (typically).
What is the molecules are too far apart to detect / be seen.
When molecules gain or lose kinetic energy, this molecular characteristic can be overcame or restored.
What is intermolecular attraction.
When a substance has a weak attraction, does it require more or less energy to be transferred out to condense or freeze the substance
It requires more energy to be transferred out.
What is burn.
The reason why everything in the room is at the same temperature but not in the same phase is because of the differences in this molecular quality.
What is attraction. (intermolecular attraction)
When a substance has the most kinetic energy that its molecules can hold before separating, the substance is in this phase
What is a gas.
As more kinetic energy is gained by the molecules, this also changes about the molecules.
What is freedom of movement.
When the intermolecular attraction is strong, would it require more or less energy to be transferred in to melt or evaporate the substance.
It would require more energy to be transferred in.
There are two substances: Substance A and Substance B. Both are liquid, have the same mass, and the same amount of thermal energy being transferred out. After 5 minutes, Substance B is now a solid; Substance A is still a liquid. Which Substance has the stronger intermolecular attraction.
Substance B.
When a substance undergoes combustion/burning, this molecular quality is broken/changing.
What is intramolecular attraction.