All Flashcards
What is a mole?
A mole is a unit representing 6.022 x 10²³ particles (atoms, molecules, ions, etc.).
What is molar mass?
The mass in grams of one mole of a substance, expressed in g/mol.
What is Avogadro's number?
The number of particles in one mole of a substance: 6.022 x 10²³.
What is dimensional analysis?
A technique for converting between different units using conversion factors to cancel out unwanted units.
Define atomic mass.
The mass of one atom in atomic mass units (amu); numerically equal to molar mass in g/mol.
Label the components of an atom.
1: Protons (in nucleus), 2: Neutrons (in nucleus), 3: Electrons (orbiting nucleus)
What is the effect of using an incorrect molar mass in calculations?
It leads to incorrect mole conversions and inaccurate quantitative results.
What happens if you forget to use Avogadro's number when converting moles to the number of atoms?
The calculated number of atoms or molecules will be incorrect by a factor of 6.022 x 10²³.
What is the effect of correctly applying dimensional analysis?
Accurate conversion between units, leading to correct solutions in quantitative problems.
What happens when MgCO₃ is heated?
It decomposes into MgO(s) and CO₂(g): MgCO₃(s) → MgO(s) + CO₂(g).