The law of fixed composition

Quiz: Dalton's Atomic Theory

1. Hydrogen combines with nitrogen in a 3:14 weight ratio to form ammonia. If every molecule of ammonia contains three atoms of hydrogen and one atom of nitrogen, an atom of nitrogen must weigh:

	14 times the mass of a hydrogen atom		3 times the mass of a hydrogen atom
	3/14 times the mass of a hydrogen atom		14/3 times the mass of a hydrogen atom

2. Dalton viewed chemical change as:

	a change of atoms from one type into another		a nuclear exchange
	creation and destruction of atoms		a rearrangement of atoms
	a transfer of electrons		a transfer of protons

3. Dalton based his relative atomic weight scale on:

lithium

oxygen

carbon

hydrogen

helium

4. Dalton said that elements are different distinguished from each other by:

	the charge on their ions		the density of their solid forms
	the weights of their atoms		the shapes of their atoms

5. Hydrogen combines with oxygen in a 1:8 weight ratio to form water. If every molecule of water contains two atoms of hydrogen and one atom of oxygen, an atom of oxygen must weigh:

	16 times the mass of a hydrogen atom		1/16 times the mass of a hydrogen atom
	1/8 times the mass of a hydrogen atom		8 times the mass of a hydrogen atom

Dalton's Atomic Theory
Page 1: Introduction
Page 2: Dalton's assumptions Five steps forward and one step back.
Page 3: Atoms in compounds An "invisible hand" fixes atom ratios in compounds
Page 4: Atoms in reactions Dance of the atoms
Page 5: Learning check Take a quiz on Dalton's Atomic Theory
Page 6: References and resources

General Chemistry Online! Quiz