vocab
what is the definition of energy?
the ability to make things move or change
When a thing gains or loses _____, the energy gained or lost is divided among all the molecules of the thing.
energy
what is the definition of stability?
when something stays mostly the same over time
When a thing gets colder, its molecules are moving ___ and have less kinetic energy.
slower
what is the definition of molecule?
a group of atoms joined together in a particular way
what is the definition of collision?
the moment when two objects hit each other
The molecules of a system will _____energy until the system reaches a stable state known as equilibrium, in which all of the molecules are moving at about the same speed.
transfer
what is the definition of thermal energy?
the total kinetic energy of all the molecules that make up a sample
For things at the same ______, the thing with more molecules has more total kinetic energy (thermal energy) than the thing with fewer molecules.
temperture
what is the definition of matter?
anything that has mass and takes up space
what is the definition of bacteria?
tiny organisms that are made of a single-cell
When a thing gets hotter, its molecules are moving faster and have more ______.
Kinetic energy
what is the definition of transfer?
to move from one object to another or one place to another
When two things are in contact, their molecules ______, and kinetic energy transfers from the faster‑moving molecules to the slower‑moving molecules.
collied
what is the definiton of infer?
to reach a conclusion using evidence and reasoning
what is the definition of groundwater?
water that is underground
Energy isn’t created or _____. Therefore, as energy transfers, it increases in one part of the system as it decreases in another part of the system. The total energy of a system doesn’t change.
destroyed
what is the definition of pasteurize?
to make something safe to eat or drink by heating it
When a thing ____ or loses energy, the energy gained or lost is divided among all the molecules of the thing.
gains
what is the definition of equilibrium?
a balanced state in which a system is stable, such as when two or more samples are at the same temperature
what is the definition of change?
when something becomes different over time
At ________, the average kinetic energy (temperature) of the molecules in the system is the total kinetic energy (thermal energy) evenly divided by the number of molecules in the system.
equilibrium
what is the definition of water heater?
a heating unit that stores and warms water
Things are made of _____ (or other types of atom groups).
molecules
what is the definition of average?
a number that summarizes a set of data and that can be computed by adding all the numbers in a list and then dividing by the number of numbers in the list