IPS Quest 1/31/12
Terms in this set (85)
TRUE OR FALSE: The faster that particles of matter move, the more kinetic energy they have
A measure of the average kinetic energy of the individual particles in matter
Which particles move faster? The particles in a mug of hot cocoa or the particles in a glass of cold chocolate milk?
High-temperature particles have high average kinetic energy-the particles in the hot cocoa move faster. (The hotter, the faster the particles move.)
3 common scales for measuring temperature?
Farenheit, Celsius, Kelvin
Most common temperature sclae in the U.S.
Temperature scale used in most of the world
Temperature scale used in physical science
Intervals on the Fahrenheit scale
Which scale is divided into 100 equal parts between the freezing and boiling of water?
Temperature called at which no more energy can be removed from matter/pt at which particles stop moving
Fahrenheit absolute zero
Fahrenheit pt where water freezes
Fahrenheit pt where water boils
Celsius absolute zero
Celsius pt where water freezes
Celsius point where water boils
Kelvin absolute zero
Kelvin point where water freezes
Kelvin point where water boils
Total energy of the particles in a substance
Thermal energy depends on 3 things. Name them....
1) the temperature of a substance 2) how the particles of a substance are arranged 3) the number of particles of a substance
What is a substance's specific heat?
The amt of energy required to raise the temperature of 1 kg of a material by 1 Kelvin
The unit of measure for specific heat
Joules per kg-Kelvin or J (kg x K)
Materials with a high specific heat can absorb a great deal of thermal energy without a great change in _________.
Energy gained or lost by an object is related to 3 things. Name them.
mass, specific heat, change in temperature
Formula used to calculate thermal energy changes
change in energy-mass x specific heat x change in temperature
Think of a metal spoon in a pot of hot water. How do the particles of the water affect the particles of the spoon?
The fast-moving particles in the hot electric coil collide with the slow-moving particles in the cool pot. the transfer of heat causes the pot's particles to move faster. Then the pot's particles collide w/the water's particles which collide with the spoon's particles.
how is heat transferred in convection?
By movements of currents within a fluid (air or liquid)
The circular motion of fluid caused by rising and sinking of heated and cooler fluid known as ____________________.
Why does hot water rise?
Bc it's dense
When hot water cools does it rise or go back to the bottom?
back to the bottom
FALSE OR TRUE: Radiation transfers energy only thru matter.
FALSE-Radiation can travel thru empty space too!
Process of conduction
particles don't move places, they collide w/each other
Ex of conduction
metal spoon in hot water
Process of convection
particles moving and changing places; movements of currents within a fluid
ex of convection
water at bottom of pot, lava lamp
process of radiation
ex of radiation
sun's energy, fire from fireplace
When heat flows from one substance to another, what happens to the temp of the substance giving off the heat & to the temp of the substance receiving the heat?
The substance receiving the heat's thermal energy increases, the substance giving the heat's thermal energy decreases
Why can't ice transfer coldness into another substance?
Coldness means no thermal energy. Ice cannot transfer coldness. it is the substance that is losing thermal energy-that is why the substance is getting colder.
What happens when we lay down in the snow?
The snow is not making us colder; we are losing thermal energy.
A material that conducts heat well:
A material that does not conduct heat well:
examples of insulators
air, wood, wool, fiberglass
examples of conductors
An entire lake is heated by water from a hot spring at the bottom of the lake. What is the method of heat transfer?
Sunlight melts a wax crayon left outside. What is the method of heat transfer?
A burner on a stove heats the bottom of the pot. Name the method of heat transfer.
The inside frame of your front door feels cold during winter. What is the method of heat transfer?
A kite rises high above a hot, sandy beach. Name the method of heat transfer.
You feel the warm glow of a bonfire. Name the method of heat transfer.
Heat is transferred directly from one particle of matter to another.
Definition of conduction.
Material that transfer heat well.
Definition of conductor
A circular flow of warmer fluid and cooler fluid.
Definition of convection current
A material that does not conduct heat well.
Definition of insulator.
The transfer of energy by electromagnetic waves.
Definition of radiation.
Heat is transferred by the movement of currents within a fluid.
Definition of convection
TRUE OR FALSE: Most matter on Earth can exist in 3 states
The particles that make up a ________ are packed together in a relatively fixed position.
Have definite volume
Particles can move around: liquid, solid, or gas?
state of matter where particles only vibrate back and forth:
state of matter where particles expand to fill all the space available:
Matter can change from one state to another when __________ is _____________ or _____________.
thermal energy, absorbed, released
A glass of ice at 0 degrees C changes to a glass of water at 0 degrees C. What caused the ice to change to water?
Thermal energy was absorbed.
Why didn't the temp of the water change in the previous question?
Thermal energy that is added to ice melts ice before it changes temp. The ice melts into water which stays at 0 degrees until more thermal energy is added. All the thermal energy is going into the melting
Lengths of railway tracks have small gaps between them. Why are the tracks built this way and what would happen if there were no gaps?
As the tracks get hot in the summer, they expand. If there aren't spaces between the tracks, the tracks will buckle up.
When a substance changes from a solid to a liquid, what is happening?
A solid, liquid, and gas are all examples of _______ of matter.
Change of state from gas to liquid called....
When vaporization takes place on the surface of a liquid, it is called....
Vaporization takes place on and below the surface of a liquid at higher temperature
process by which matter changes from a liquid to a solid
expansion of matter when it is heated
Physical change from one state of matter to another
change of state
Which has more thermal energy? liquids or solids?
When we eat snow what happens?
We are using and giving away our thermal energy-why our body is getting colder. We are lowering our body temperature and giving TE to the ice.
What happens to the particles of a solid as it becomes a liquid?
Particles of a solid are absorbing thermal energy and transforming into a liquid.
change from liquid to gas. takes place when particles in liquid gain enough energy to form gas.
opposite of vaporization
process that occurs as pcs of ice gradually get smaller
condensation. occurs when particles in gas lose enough thermal energy to form liquid.
Thermal energy that is transferred from matter at a higher temp to matter at a lower temp.
process that occurs when vaporization takes place only on the surface of a liquid
change in state from solid to gas without passing liquid state
the process that occurs when vaporization takes place inside a liquid as well as on the surface
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