Laws, Atoms and the Mole

Name: Laws, Atoms and the Mole
Author: StemPy Lab

Five laws of chemical combination led Dalton to the atom. Use them, find atomic and molecular masses, and meet the mole: the chemist's way of counting particles by weighing them.

3 lessons, about 1 h 30 min3 simulations11 problems6 practice questionsPython in every lesson

Created by StemPy Lab

Course outline (3 lessons)

Lesson 1about 30 min
The laws of chemical combination
By the end of the 1700s, careful weighing showed five rules. Mass is never lost in a reaction. A compound always has the same make-up by mass. Two elements that form several compounds do so in simple whole-number ratios. Gases react in simple ratios of volume. Equal volumes of gases hold equal numbers of molecules.
1 simulation2 practice questions1 Python program4 problems
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Lesson 2about 30 min
Atomic and molecular masses
Dalton explained the laws with atoms that have fixed masses. Atomic masses are measured in atomic mass units: one u is one twelfth of the mass of a carbon-12 atom. Most elements are mixtures of isotopes, so their atomic mass is a weighted average. Adding atomic masses gives molecular mass and formula mass.
1 simulation2 practice questions1 Python program4 problems1 Python lab
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Lesson 3about 30 min
The mole and molar mass
A mole is $6.022 \times 10^{23}$ particles, the Avogadro constant. The molar mass of a substance, in grams per mole, has the same number as its molecular or formula mass in u. Moles join mass and particles: $n = m/M$ and $N = n N_A$ .
1 simulation2 practice questions1 Python program3 problems1 Python lab1 question set1 note
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More onAtoms and Molecules › Laws of Chemical Combination Atoms and Molecules › The Mole Concept Atoms and Molecules › Molecules, Ions and Formulae

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Laws, Atoms and the Mole

Course outline (3 lessons)

The laws of chemical combination

Atomic and molecular masses

The mole and molar mass

Test Your Learning

Your teacher

Discussion (0)