Atoms & Periodicity
Which has larger radius: Mg or Ca?
Ca
Name: Ca(NO₃)₂
calcium nitrate
Balance:
Na + Cl₂ → NaCl
2Na + Cl₂ → 2NaCl
use this balanced equation for some:
2Al + 3H₂SO₄ → Al₂(SO₄)₃ + 3H₂
Mole ratio H₂SO₄ : H₂?
1:1
Which has higher electronegativity: N or Cl?
Cl
Which has higher ionization energy: P or S?
P
Write formula: aluminum sulfate
Al₂(SO₄)₃
Balance:
Ca(OH)₂ + HCl → CaCl₂ + H₂O
Ca(OH)₂ + 2HCl → CaCl₂ + 2H₂O
use this balanced equation:
2Al + 3H₂SO₄ → Al₂(SO₄)₃ + 3H₂
How many moles H₂ from 6 mol H₂SO₄?
6 mol H₂
Name: Fe(NO₃)₃
iron(III) nitrate
Which is more electronegative: Cl or S? explain trend
Cl
Name: CuSO₄
copper(II) sulfate
Balance:
Al + H₂SO₄ → Al₂(SO₄)₃ + H₂
2Al + 3H₂SO₄ → Al₂(SO₄)₃ + 3H₂
use this balanced equation:
2Al + 3H₂SO₄ → Al₂(SO₄)₃ + 3H₂
How many moles Al needed for 9 mol H₂SO₄?
6 mol Al
Balance:
(NH₄)₂CO₃ → NH₃ + CO₂ + H₂O
(NH₄)₂CO₃ → 2NH₃ + CO₂ + H₂O
Rank by ion size: O²⁻, F⁻, Na⁺
O²⁻ > F⁻ > Na⁺
Write formula: iron(III) phosphate
FePO₄
Convert:
3.0 moles Na₂SO₄ → molecules units
1.81 × 10²⁴ units
use this balanced equation:
2Al + 3H₂SO₄ → Al₂(SO₄)₃ + 3H₂
How many moles Al₂(SO₄)₃ from 4 mol Al?
2 mol
How many grams in 2.5 mol NaCl?
146.25 g
Which is more reactive and why: K or Ca?
K
Name: (NH₄)₃PO₄
ammonium phosphate
Balance (polyatomic + harder):
Fe₂(SO₄)₃ + KOH → K₂SO₄ + Fe(OH)₃
Fe₂(SO₄)₃ + 6KOH → 3K₂SO₄ + 2Fe(OH)₃
use this balanced equation:
2Al + 3H₂SO₄ → Al₂(SO₄)₃ + 3H₂
Given: 4 mol Al and 6 mol H₂SO₄
Which is limiting? how much H₂ forms?
limiting: H₂SO₄
H₂ formed: 6 mol
Balanced:
Ca₃(PO₄)₂ + 3SiO₂ + 5C → 3CaSiO₃ + 2P + 5CO
How many moles P from 2 mol Ca₃(PO₄)₂?
4 mol P