Macro-Scale Observations
Change where a liquid turns into a gas, like the Titan lake disappearing.
Evaporation
A solid's molecules are best described as moving only in this way.
Moving in place or vibrating
What measurement (in the sim) tells us the average speed of particles?
Temperature
The term for the forces that exist between molecules, which holds the substance together.
Molecular attraction
This moon of Saturn has a disappearing methane lake.
Titan
What phase change is freezing the opposite of?
Melting
What happens to particle speed when temperature increases?
They move faster
Energy must be transferred into a substance for this phase change to occur, going from liquid to gas.
Evaporation
The name of 2 forces that that are always in a game of "Tug of War" to win the phase changes
Kinetic Energy and Molecular attraction
The main substance that formed the lake on Titan.
Methane
The phase change where energy is removed from a liquid, causing it to become a solid.
Freezing
The molecules in a liquid have enough freedom of movement to do this, allowing the substance to flow.
Move around each other
When a liquid turns into a solid, this kind of energy is transferred
Transferred out
Transferring energy into a substance increases the _____ energy of its molecules.
Kinetic Energy
The phase change that would result if energy were transferred out of the liquid methane lake.
Freezing
What must be added or removed for a phase change to happen?
Energy
A gas's molecules have enough kinetic energy to this
Move away from each other
A phase change happens when kinetic energy overcomes molecular _____.
attraction
This kind of attraction overcomes Kinetic Energy being Transferred out
Strong Attraction
What likely happened to Titan's lake between 2007 and 2009?
It Evaporated
This change is where a gas turns into a liquid, often seen as dew on a cold morning
Condensation
During a phase change, this molecular movement changes, causing a macro-scale change in appearance.
freedom of movement
Scientists digging in a cave found an unknown substance. The scientists found that the substance’s molecules were moving around each other. The scientists increased the speed of the substance’s molecules and caused a phase change.How did the scientists do this, and how did this affect the substance?
The scientists transferred energy . . .
a into the substance, and the substance changed into a gas.
Substances with stronger molecular attraction need more energy for this to happen (melting or boiling).
Phase Change
Why didn't the methane lake evaporate before 2007?
enough energy was NOT transferred Into THE LAKE to overcome molecular attraction?