Mixed Questions
Name the phases where the molecules are moving from FASTEST to SLOWEST
Gas - liquid - solid (C)
Which of the following describes the process of a substance changing from a gas to a liquid?
Condensation (D)
What is kinetic energy?
Energy in movement
The lake on Titan did what: (phase change)
Evaporate
What is a molecule?
A group of any atoms
Which phase has no shape at all and fills a container?
Gas (C)
What is freedom of movement?
How the molecules in a substance are able to move (A)
Which substance has the highest amount of kinetic energy?
Gas (C)
Moon, Saturn
Changingthe kinetic energy of the substance changes what the molecules are (True/false)
False (MOLECULES DO NOT CHANGE INTO OTHER MOLECULES DURING PHASE CHANGE, THIS IS MAGIC-- NOT SCIENCE)
Which phase takes the shape of its container and is able to flow/pour?
Liquid (B)
Mr. Nguyen accidentally left his G-Fuel (a drink) in his classroom. He came back the next day to find that half of his G-Fuel (not sponsored) was gone. What caused this?
The missing G-Fuel evaporated and became a gas (B)
Which of the following phase changes requires energy to be transferred into the substance?
melting, evaporation
How long are the summers on Titan?
7 years!!
Temperature is a measure of the molecules:
Speed (kinetic energy)
How do we know (at the molecular scale) if a phase change has occurred?
The molecules move in a different way (A)
Mr. Nguyen’s cold drink begins to “sweat” and water droplets form on the outside. He wonders: “What could have caused this?”
Evaporation (A)
A molecule with more kinetic energy will be: (describe speed)
Moving faster
What was the solution to the lake’s disappearance? (provide answer, AND evidence)
The lake evaporated, this is because 2007-2009 was all summer. In summer, there is more energy transferred in
Which of the following phases describes when the molecules are farthest apart?
Gas
You wake up one morning and find liquid water on the grass. It did not rain or snow last night. This is an example of what phase change?
Condensation (D)
When evaporation occurs in a dish of water, the molecules left behind in the water (compared to the molecules that have been evaporated)
a) less energetic
b) less speed
c) lower temperature
d) closer together
e) all of the above
All of the above (e)
The statement: “A change in kinetic energy always results in a phase change” is- (True/false and then provide an explanation as well)
False, a phase change only occurs when the molecules are able to move differently.
What is the temperature of Titan? (in *C or *F)
-179 *C or -290 F
When energy is removed from a substance, what happens to the molecules?
The molecules get closer together