Naming Compounds
What is the name of CaCl₂?
Calcium Chloride
Balance:
H₂ + O₂ → H₂O
2H₂ + O₂ → 2H₂O
What type of reaction is:
2H₂ + O₂ → 2H₂O
Synthesis
Will Zn replace Cu in CuSO₄?
Yes
What is oxidation?
loss of Electrons
Which compound requires a Roman numeral: FeCl₃ or NaCl?
FeCl3
Mg + O₂ → MgO
2Mg + O₂ → 2MgO
What type of reaction is:
CaCO₃ → CaO + CO₂
Decomposition
Will Cu replace Zn in ZnSO₄?
What is the oxidation number of O in most compounds?
-2
Write the formula for aluminum sulfate.
Al₂(SO₄)₃
Al + Cl₂ → AlCl₃
2Al + 3Cl₂ → 2AlCl₃
What type of reaction is:
Zn + CuSO₄ → ZnSO₄ + Cu
Single Replacement
Will Mg react with HCl?
Yes
In Zn + CuSO₄ → ZnSO₄ + Cu, which is oxidized?
Zinc
What is the correct name for Sn(NO₂)₂?
Tin(II) nitrite
Fe + O₂ → Fe₂O₃
4Fe + 3O₂ → 2Fe₂O₃
What type of reaction is:
AgNO₃ + NaCl → AgCl + NaNO₃
Double Replacement
Will Ag react with HCl?
No
In 2Al + 3Cl₂ → 2AlCl₃, identify what is oxidized and reduced.
Al: 0 → +3 (oxidized)
Cl: 0 → −1 (reduced)
A student names Fe₂O₃ as iron oxide. Explain why this is incomplete and give the correct name.
Iron(III) oxide; iron is a transition metal and needs a Roman numeral.
Explain why changing subscripts is NOT allowed when balancing equations.
Subscripts change the identity of the compound; only coefficients can change to conserve mass.
Explain how you can distinguish single replacement from double replacement using structure.
Single replacement has an element + compound; double replacement has two compounds exchanging ions.
Predict and balance if reaction occurs:
Fe + Pb(NO₃)₂ → ?
Fe(NO₃)₂ + Pb
Fe+O2→Fe2O3
You must:
Balance the equation.
Assign oxidation numbers to Fe and O in reactants and products.
Identify which element is oxidized and which is reduced.
Explain why this reaction satisfies the Law of Conservation of Mass AND Conservation of Electrons.
4Fe+3O2→2Fe2O3
Step 2: Oxidation Numbers
Reactants:
Fe = 0
O₂ = 0
Products:
O = −2
Fe = +3
Step 3: Identify Changes
Fe: 0 → +3 → oxidized
O: 0 → −2 → reduced