compound ✔️2 or more substances chemically combined
e.g carbon dioxide
element ✔️substance which cannot be broken down into simpler substances by chemical reaction
atom ✔️smallest piece of an element which has the same chemical properties of that element
made up of atomic particles: protons, neutrons, electrons
mixture ✔️2 or more substances physically combined
types: homogeneous/ heterogeneous
e.g. salt water, seasoning, air
heterogeneous mixture ✔️used to describe substances non-uniform in composition; not evenly mixed
, muddy water
soup
cookie batter
smoke in air
homogeneous ✔️used to describe substances uniform in composition; components are distributed
evenly throughout the mixture
e.g. sugar water
salt water
coke
mechanical mixtures ✔️solid/ solid mixtures that are unevenly mixed
e.g. saffron and salt
soil