Definitions
What is the name of a system that does not have boundaries?
Open system
What were the components of our mini lake system?
container, sand, rocks/gravel, water, air, top, salt
Is air matter? How do you know?
Yes, it takes up space and has weight.
How do particles of a solid behave?
Particles are packed closely together in a pattern.
What is the definition of property?
The attribute of a substance like state of matter, mass, density, color.
Give an example of a closed system from our experiments
Mini lakes (with lid on)
The plunger system
Why weren't there any water droplets on the bottle directly under the heat lamp?
Heat causes evaporation so directly under the lamp would be too warm for water vapor to condense.
What experiment proves air takes up space?
Blowing up a balloon or the coupled syringes.
How do particles of a liquid behave?
Particles are moving but closer together.
What is the definition of evaporation?
When particles of a liquid get heated and get too small and too spread out to be seen in the air.
When solid particles, like salt, become too spread out and too small to be seen in a liquid.
Dissolve
Two Bottle System: the water droplets in the second bottle
The water droplets on the outside of the frozen water bottle.
How are water and ice similar?
How do particles of a gas behave?
Particles are moving quickly and spread out
True or False: When water evaporates, it goes into the air and sometimes the clouds.
True
What is the definition of matter?
Anything that takes up space and has weight.
Give one example from an experiment that proves that even small solid particles have weight.
Salt dissolving in our mini lakes proves that even tiny bits of salt that we can't see have weight because the weight of our mini lakes increased after we added salt.
Is water compressible? How do you know?
It is not. The plunger could not move when pressed in the closed syringe. The particles of water are closer together and moving and cannot move closer.
How do particles of a gas behave when cooled down?
Particles slow down and come closer together.
The volume increases but the weight stays the same.
What is the definition of condensation?
When water vapor particles cool down and come back closer together and clump into bigger particles to form water droplets.
What experiment proved that air was compressible? Why is air compressible?
The syringe with a cap proved air is compressible because it was a closed system but the plunger could be moved to make the boundaries change and air took up less space. Air is compressible because the particles are more spread out and have room to move closer together.
What happens when air is heated? Think about the bubble experiment
Air expands.
Why did the Aral Sea dry up?