|
Objectives:
|
Assessment:
- Weekly chemistry organizer - Textbook problems 1-12 - Conservation of Mass Activity - Quiz 1 - 15.1 ( 5/26/17) |
IB Chemistry Topic 1 Stoichiometric relationships
|
IB Chemistry Topic 1 Stoichiometric relationships
|
|
|
|
|
|
|
The Law of Conservation of Mass Activity-Due: 8/21/17
Please complete the "Think" and "Discuss"
The law of conservation of mass - Sep Massoumi
Everything in our universe has mass - from the smallest atom to the largest star. But the amount of mass has remained constant throughout existence even during the birth and death of stars, planets and you. How can the universe grow while maintaining its mass?
1.2 The mole concept
- The mole is a fixed number of particles and refers to the amount, n, of substance.
- Masses of atoms are compared on a scale relative to 12C and are expressed as relative atomic mass (Ar) and relative formula/molecular mass (Mr).
- Molar mass (M) has the units g mol-1.
- The empirical formula and molecular formula of a compound give the simplest ratio and the actual number of atoms present in a molecule respectively.
- Calculation of the molar masses of atoms, ions, molecules and formula units.
- Solution of problems involving the relationships between the number of particles, the amount of substance in moles and the mass in grams.
- Inter-conversion of the percentage composition by mass and the empirical formula.
- Determination of the molecular formula of a compound from its empirical formula and molar mass.
- • Obtaining and using experimental data for deriving empirical formulas from reactions involving mass changes