Physical/Chemical Properties/Changes

law of conservation of mass

mass and matter cannot be created or destroyed

matter

anything that has mass and volume

mass

the amount of matter in object

volume

the space that matter takes up

macroscopic

objects that are large enough to see with the unaided eye

microscopic

the world of objects that can be seen only under magnification

physical properties

can be observed and measured without changing the substance’s composition

density

compares the mass of an object to its volume at a specific temperature—CHANGES WITH TEMPERATURE CHANGES

physical changes

changes the appearance without changing the composition of the matter

phase

any part of a sample with the same composition and properties

all lines

represent a phase change between 2 states of matter in a diagram

phase diagram

represents phases as a function of temperature and pressure

triple point

at exactly this temperature and pressure, the substance exists in all 3 states of matter at the same same time in a dynamic equilibrium

critical point

the point at which no matter how high you raise the temperature or pressure, the compound won’t leave the gas phase

chemical properties

observable only when one substance reacts with another substance

chemical changes

creates a new form of matter, a reaction occurs