Understanding matter
occupies space and has mass
What is matter?
a pure substance that consists of atoms with the same atomic number
What is an element?
four states of matter
What are solid, liquid, gas, and plasma?
anything about a substance that can be observed
What is a physical property?
SI unit for mass
What is the gram
believed that all matter was made of indivisible atoms with nothing between
Who were the Atomists?
A pure substance consisting of atoms of two or more diffent elements
What is a compound?
determined by kinetic energy and particle attraction
What is the state of matter?
the ease with which a material allows the trasfer of electrical or thermal energy
What is conductivity?
a physical property that describes how a material interacts with light
What is luster?
What is the law of definite proportions?
a physical combination of substance that does not have a uniform appearance
What is a heterogenous mixture?
fixed shape, low vibration, high density
What is a solid?
a change that alters the chemical substance
What is a chemical change?
changes of state that involve losing energy
What are condensing and freezing?
a distinct group of two or more atoms covalently bonded
What is a molecule?
also called a solution
What is a homogenous mixture?
high speed, changeable shape, high compressability
What is gas or vapor?
when solid particles get enough energy to change to a vapor
What is sublimation?
The constant, random motion of particles found in fluids due to collisions
What is brownian motion?
The most workable model of matter
What is the particle model of matter?
state of matter that makes up the stars
What is plasma?
solids that consist of a mass of particles with no discernable pattern
What are amorphous solids?
matter can neither be created nor destroyed
What is the law of conservation of matter?
a measure of a fluid's resistance to flowing
What is viscosity?