Aqueous You Doing?
This symbol means “dissolved in water.”
aqueous (aq)
To balance equations, you change these —
coefficients
A + B → AB
synthesis
Mg + HCl →
MgCl₂ and H2
sodium + chlorine → sodium chloride
Na + Cl₂ → NaCl
A solid that forms when two aqueous solutions react.
precipitate
Balance: H₂ + O₂ → H₂O
2H₂ + O₂ → 2H₂O
AB → A + B
decomposition
Ba + S →
BaS
Which is NOT evidence of a chemical reaction: gas formation, light, precipitate, or state change?
State change
How many oxygen atoms are in 2Pb(SO₄)₂?
16
HCl + NaOH → NaCl + H₂O
double displacement
neutralization
HNO₃ + Ca(OH)₂ →
Ca(NO₃)₂ and H₂O
Write formulas: lead(II) nitrate + potassium iodide → lead(II) iodide + potassium nitrate
What is Pb(NO₃)₂ + KI → PbI₂ + KNO₃?
Name the state symbol for a gas.
(g)
Balance: Fe + O₂ → FeO
2Fe + O₂ → 2FeO
Na₂S + 2Li → Li₂S + 2Na
single displacement
Complete and balance the single replacement reaction:
Al + CuCl₂ →
2Al + 3CuCl₂ → 2AlCl₃ + 3Cu
Classify this as physical or chemical: dissolving sugar in water.
physical change
Balance: COCl₂ + H₂O → HCl + CO₂
COCl₂ + H₂O → 2HCl + CO₂
C₅H₁₂ + O₂ → CO₂ + H₂O
combustion
Complete and balance combustion of pentane: C₅H₁₂ + O₂ →
C₅H₁₂ + 8O₂ → 5CO₂ + 6H₂O
Write, balance, add states, AND classify:
Iron(III) oxide reacts with carbon monoxide to form iron and carbon dioxide.
Fe₂O₃(s) + 3CO(g) → 2Fe(s) + 3CO₂(g),
single replacement (redox)