Physical Science - 2A Quiz

matter

anything that occupies space and has mass

law of definite proportions

the law that states that the masses of chemical substances combine in definite, characteristic integer ratios when forming compounds

particle model of matter/kinetic model

a model that states that all physical matter exists in the form of particles (atoms or molecules) in constant motion

atom

the building block of all matter, consisting of protons, electrons, and neutrons

molecule

a distinct group of two or more covalently bonded together

(Democritus)

believed that matter was made of indivisible atoms and that nothing existed between them

(Aristotle)

believed that matter consisted of a continuum that could be infinitely cut without changing the characteristics of that matter

element

a pure substance that consists of atoms with the same atomic number

compound

a pure substance consisting of atoms of two or more different elements that are chemically combined

weight

the measure of gravity acting on the matter in an object

mass

amount of matter in an object

diffusion

when the scent of pizza spreads throughout the house

brownian motion

theory that came about with an experiment of plant spores (parts of the spores moved randomly)

behavior of gases and data from chemical reactions

what evidence proved that a model of matter was made of atoms?