General Knowledge
how fast molecules/atoms are moving
A vacuum is...
a space with no matter
Popcorn is made because the volume of water inside the kernel ______.
increases
Thermal energy can do 2 things...
1. change the speed of molecules/atoms
2. change bonds between atoms/molecules
Use the term "thermal energy transfer" to explain why we feel cold when we touch ice?
our TE is transferring to the ice
True or false: TE can change the bonds of molecules/atoms
true
Air pressure is...
the force cause by gravity pulling air towards the Earth
The phase change that causes popcorn to be created is...
vaporization/evaporation
True/False: during a phase change, temperature is changing.
false
Referencing the distance between molecules, why does it take less energy to turn ice into liquid than it does to turn liquid into gas?
kinetic energy
How does creating a vacuum affect the temperature of water?
It can either lower the temperature of water or not change the temperature at all - it does NOT increase the temperature of water.
How does volume play a role in making popcorn?
In order for the shell to burst, water must take up more volume than the kernel has.
false
This is weird to think about but: without a pressurized suit in space, what happens to the blood in our bodies?
it boils
Kinetic energy is...
energy in motion/use
After we created a vacuum in our little jars, was there more pressure inside the balloon or outside the balloon?
Inside.
Explain how popcorn is made using these vocabulary terms: mass, volume, vaporization, and transfer.
Results may vary.
What is the process of lava hardening into rock called?
Freezing
A marshmallow is fluffy because it has a lot of air in it (kind of like a sponge). Using that information, why did the mallow get reeeeeally small after we let air back into the jar?
As the air rushed in, it was not able to get back inside the mallow, so the air pressure squished it.
During a phase change, chemical composition _____ change.
Does not
Why can water boiling without increased thermal energy inside a vacuum?
results may vary
Corn kernels need to be AT LEAST 14% water to be turned into popcorn - why?
So there is enough water matter to break the shell
When adding thermal energy to an object, when is the temperature not changing?
during the phase change
It's winter time so you have the heat on in your car. Why does the inside of your windshield keep fogging up?
the hot air is touching the cold windshield and condensing.