# Shared Flashcard Set

## Details

Particles in Motion
Pressure; Energy Transfer; Temperature
34
Science
8th Grade
12/01/2009

## Cards Return to Set Details

Term
 How heat effects particles in solids, liquid's and gas substances
Definition
 heat determines their state of matter
Term
 What happens to particles when heat is added to a substance
Definition
 the particles move faster
Term
 How does adding heat to a substance cause expansion
Definition
 the particles move faster, and this can cause the substance to change it's state of matter, or for example in a botle in baloon system the particles have more engery and cause bigger collisions which take up more room.
Term
 What happens to the density of a substance when heat is added
Definition
 it becomes less compact, and less dense
Term
 What happens to particles when heat is taken away from a substance?
Definition
 the particles slow down.
Term
 How does taking away heat from a substance cause contraction
Definition
 the particles slow down, and compact which takes up less space.
Term
 What happens to the density of a substance when heat is taken away
Definition
 the density becomes more compact and is more dense
Term
 Do particles ever stop moving
Definition
 no - except for 0 on the kelvin scale
Term
 Is energy created or destroyed
Definition
 niether, it can only be stored and transferred
Term
 How does energy transfer from particle to partcile
Definition
 partccles transfer engery by coliding with one another.
Term
 in what direction does energy transfer? High to Low? Low to High?
Definition
 High to Low. The highest speed particle in the collision cannot gain more energy it can only transfer energy away.
Term
 What is the difference between particles with high kinetic energy and low kinetic energy
Definition
 particles with low kinetic energy are slower moving then high kinetic energy particles.
Term
 Energy transfers through the universe in what three ways?
Definition
 Conduction, Convection, Radiation
Term
 What phase of matter does convection, conduction, and radiation take place in?
Definition
 convection - liquids and gasesconduction - solidsradiation - in space
Term
 What do we call solids that are good conductors?
Definition
 Conductors
Term
 What do we call solids that are bad conductors?
Definition
 Insulators
Term
 How is density involved in convection?
Definition
 particles closest to the heat become less dense and rise away from the heat, while the particles further away from the heat become more dense and fall closer to the heat which than starts this cycle over which continues continues while the heat source is avialable
Term
 What is the motion and position of the particles in solids, liquids, and gas substances
Definition
 Solids - close togeher and vibrationliquids - are further aparts and bumping into one anothergases - are moving really fast and bumping into on another all the time.
Term
 How do substances change phases or states of matter (think of particle theater from class)
Definition
 when the particles increase speed or decrease.
Term
 Pressure vs Temperature; What happens to the pressure when you increase or decrease the temperature.
Definition
 When the temperature increases so does the pressure, and when the temperature decreases so does the pressure.
Term
 Pressure vs Volume: what happens to the pressure when you increase or decrease the volume.
Definition
 When you descrease the volume of space available the pressure increase, and when you increase the volume avilable the pressure decreases.
Term
 Pressure vs Mass : what happens to the pressure when you increase or decrease mass?
Definition
 The pressure stays the same
Term
 What is temperature a measure of?
Definition
 the average kinetic energy of the particles in a substance.
Term
 What causes temperature to increase and decrease
Definition
 the amount of kinetic energy in the substances particles, which can be increased by heat, or decreased by cooling.
Term
 Thermal Energy
Definition
 energy from heat.
Term
 Kinetic Energy
Definition
 the energy of motion
Term
 Heat
Definition
 the total energy given off by the vibrating particles in a substance
Term
 Pressure
Definition
 the force pushing on a surface, divided by the area of the surface.
Term
 Expand
Definition
 when a substance gets larger
Term
 Contract
Definition
 when a substance gets smaller
Term
 Transfer (Energy Transfer)
Definition
 how energy is moved from one place, or particle to another.
Term
 Conduction
Definition
 how energy transfers through solids.
Term
 Convection
Definition
 how energy transfers in liquids and gasses
Term
 Radiation
Definition
 how energy moves through space.
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