Chemistry unit 2 review

with out the element practice

Democritus

Proposed that matter is made up of small, indivisible particles called atoms.

John Dalton

Developed the first modern atomic theory; atoms of the same element are identical.

J.J. Thomson

Discovered the electron; proposed the "plum pudding" model.

Ernest Rutherford

Discovered the nucleus through the gold foil experiment.

Niels Bohr

Said electrons orbit the nucleus in fixed energy levels.

Erwin Schrödinger

Developed the quantum mechanical model of the atom.

James Chadwick

Discovered the neutron in the atomic nucleus.

Definition (Back)

Ice melting

Physical change

Burning wood

Chemical change

Dissolving sugar in water

Physical change

Rusting of iron

Chemical change

Boiling water

Physical change

Baking a cake

Chemical change

Crushing a can

Physical change

Milk souring

Chemical change

Term (Front)

Definition (Back)

Salt water

Homogeneous

Oil and water

Heterogeneous

Air

Homogeneous

Salad

Heterogeneous

Vinegar

Homogeneous

Chocolate chip cookie

Heterogeneous

Steel

Homogeneous

Sand and iron filings

Heterogeneous