Heat, Temperature, Waves, Electricity, & Light Flashcards
True or false: Molecules are the smallest units of matter with the characteristic properties of a substance.
true
True or False: Water beads up on wax paper because its cohesive forces are greater than the adhesive forces.
true
The attractive forces between unlike molecules is called what?
adhesion
Describe molecules in a solid
nearly fixed positions by strong attractive forces
Anytime a temperature difference occurs, you can expect what?
heat movement from high temperature regions to lower temperature regions
True or false: The molecules of a gas are much closer together than molecules in a solid or liquid.
false
True or false: Liquid water at 0ºC has to give up energy in order to become ice at 0ºC
true
When water vapor condenses to a liquid, does it transfer heat to surroundings or absorb heat from surroundings?
It transfers heat to the surroundings
When the evaporation rate equals the condensation rate, what happens in the space above the liquid?
cooling
True or false, temperature always increases when heat is added
False: If matter is going through a phase change, temperature remains the same
The great cooling effect produced by water evaporating comes from what?
high latent heat
What is latent heat?
Heat absorbed or radiated during a phase change
What is specific heat?
The number of calories of heat required to raise the temperature of one gram of a substance one degree Celsius
True or False: The transfer of heat that takes place by energy moving through space is called convection.
False
Define convection
Transfer of heat through liquid or gas
Define conduction
The transfer of heat that occurs when energy moves from molecules to molecule
True or false: Iron heats up more rapidly than does aluminum because it has a greater specific heat.
False
The heat needed to warm one gram of water one Celsius degree is called what?
calorie
Why is the water in a swimming pool cooler than the surrounding sidewalk
because it has a higher specific heat
A statement that the energy supplied to a system in the form of heat, minus the work done by the system, is equal to the change in internal energy represents what scientific law?
first law of thermodynamics
The heat death of the universe is a theoretical time in the future when the universe is supposed to…
freeze at a uniform low temperature
Define adhesion
The attractive force between two unlike bodies
Define cohesion
The uniting molecular force between bodies
