calcium + oxygen → - Answers Ca + O₂ → CaO
copper + sulfur (S₈) → copper(II) sulfide - Answers Cu + S₈ → CuS
calcium oxide + water → calcium hydroxide - Answers CaO + H₂O → Ca(OH)₂
hydrogen + nitrogen → ammonia (NH₃) - Answers H₂ + N₂ → NH₃
hydrogen + chlorine → hydrogen chloride (HCl) - Answers H₂ + Cl₂ → HCl
silver + sulfur (S₈) → - Answers Ag + S₈ → Ag₂S
chromium + oxygen → chromium(III) oxide - Answers Cr + O₂ → Cr₂O₃
aluminum + bromine → - Answers Al + Br₂ → AlBr₃
sodium + iodine → - Answers Na + I₂ → NaI
hydrogen + oxygen → water - Answers H₂ + O₂ → H₂O
aluminum + oxygen → - Answers Al + O₂ → Al₂O₃