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Particle Theory of Matter
grade 8 unit test
25
Science
8th Grade
04/10/2013

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Cards

Term
What are the 5 laws of particle theory?
Definition
1. All matter is made of particles (atoms and molecules)
2. Particles have empty space between them
3. Particles are constantly moving
4. Particles move faster and spread further apart when heated
5. Particles are attracted to each other
Term
What are the 3 states of matter?
Definition
Solid Liquid and Gas
Term
Particles are constantly in motion. True or False.
Definition
True
Term
Particles in a solid are not in motion. True or False.
Definition
False. While particles in solids are not free to flow they do have a vibrating motion. All particles are in motion.
Term
In solids, particles have lots of space between them. True or False.
Definition
False. Solid particles have small spaces between them, liquids have more space between them and gases have the most.
Term
Describe Gases
Definition
fill containers space
very large space between particles
weak attraction
free to flow
Term
Describe Liquids
Definition
take containers shape
large space between particles
medium attraction
free to flow
Term
Describe Solids
Definition
Defined shape and volume
small space between particles
strong attraction
vibrating motion
Term
flow rate
Definition
measures how quickly a fluid moves or the volume of fluid moving past a certain point
Term
viscosity
Definition
thickness of a liquid or resistance to flow
Term
high viscosity liquids
Definition
honey, ketchup, molasses
Term
low viscosity liquids
Definition
rubbing alcohol, oil, water
Term
List the 7 factors that affect flow and viscosity
Definition
1.type of fluid (thick or thin)
2.force pushing or pulling fluid
3.size of container flowing throw
4.surface fluid moving over
5.temperature of fluid and environment
6.cohesion - force of attraction between particles in fluid
7.adhesion - force of attraction between liquid and other substances
Term
Define Cohesion
Definition
the force of attraction between the particles in a liquid. Example - water particles act like a magnet and attract each other
Term
Define Adhesion
Definition
force of attraction between liquid and another substance. Example - milk sticks to the glass and your lips
Term
What happens to flow when the temperature is increased?
Definition
flow rate increases and viscosity is decreased
Term
Why does temperature increase flow and decrease viscosity?
Definition
1. energy is addded
2. particles move faster
3. particles spread farther apart
4. less attraction between particles
5. less resistance to flow
Term
fluid mechanics
Definition
study of how fluids behave both at rest and in motion
Term
fluid dynamics
Definition
study of fluids in motion
Term
density
Definition
the relationship between mass and volume
Term
mass
Definition
how many particles are in set amount
Term
volume
Definition
the amount of space considered
Term
equation to calculate density
Definition
mass/volume
Term
equation to calculate volume
Definition
mass/density
Term
equation to calculate mass
Definition
density X volume
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