Chemistry Module 1 Questions -

The periodic table is a legal "cheat sheet." Use it to find molar masses, groups, and periods.

: Convert between mass, moles, and number of particles using Avogadro's number ( Empirical Formulae chemistry module 1 questions

Key Concept: Isotopes have the same number of protons but different neutrons. The periodic table shows the weighted average of all naturally occurring isotopes. 2. Electron Configuration and Shells The periodic table is a legal "cheat sheet

(a) CaCl₂ (Calcium is +2; Chlorine is -1; cross the charges). (b) N₂O₄ (The prefixes "di" and "tetra" tell you the number of atoms). (c) Fe₂O₃ (Iron(III) means Fe³⁺; oxide is O²⁻; you need two Fe³⁺ to balance three O²⁻). (c) Fe₂O₃ (Iron(III) means Fe³⁺; oxide is O²⁻;

: Determine the simplest whole-number ratio of atoms in a compound from percentage composition. Stoichiometry

: Which subatomic particle is attracted to a positively charged metal plate?