How To Identify Each Question Midterm 1

Given grams OR asked for grams

Problem type: Mass ↔ mole conversion

Atoms, molecules, formula units mentioned

Problem type: Particle ↔ mole conversion

% by mass OR find % of element

Problem type: Percent composition

Given % or masses of elements

Problem type: Empirical formula

Given molar mass + empirical formula

Problem type: Molecular formula

Balanced equation + one amount given

Problem type: Stoichiometry

Two reactants given

Problem type: limiting reactants

Actual vs theoretical yield

Problem type: Percent yield

Moles, volume, concentration

Problem type: molarity

Stock solution → dilute

Problem type: Dilution

Strong electrolytes (aq), spectator ions

Problem type: Ionic equations

Two aqueous solutions → solid forms?

Problem type: Precipitation reaction

Rule: Use solubility rules

Oxidation numbers, electrons, activity series

Problem type: redox

Rules:

Oxidation = loss of electrons

Reduction = gain of electrons

Activity series predicts if reaction occurs