Atoms & Electron Structure
Phosphorus has this many valence electrons.
What is 5 valence electrons?
These bonds exist within a polar molecule.
What are polar covalent bonds?
One mole of H₂O equals this many grams.
What is 18.02 g of H₂O?
Spectator ions are this in a net ionic equation.
What are ions absent from the net ionic equation?
The number used as a conversion factor in stoichiometry problems.
What is the balanced coefficient?
This number of electrons appears in the Lewis structure of an oxygen atom.
What is 6 electrons?
This bond is polar covalent: Na–F, H–F, or F–F.
What is H–F?
One mole of a substance equals this many particles.
What is 6.022 × 10²³ particles?
Cr(NO₃)₃ + Na₂S forms this insoluble product.
What is Cr₂S₃(s)?
This reaction occurs between sodium carbonate and lead(II) nitrate.
What is a double replacement reaction forming PbCO₃(s)?
The Lewis dot diagram of NCl₃ requires this many total valence electrons.
What is 26 valence electrons?
This molecule is polar: N₂, H–Cl, CH₄, or O₂.
What is H–Cl?
One mole of Ca(NO₃)₂ contains these amounts of Ca, N, and O atoms.
What are 1 mol Ca, 2 mol N, and 6 mol O atoms?
This balanced equation shows Na₃PO₄ reacting with Ba(NO₃)₂.
What is 2 Na₃PO₄ (aq) + 3 Ba(NO₃)₂ (aq) → Ba₃(PO₄)₂ (s) + 6 NaNO₃ (aq)?
This is the number of moles of tin in 38.1 g of Sn.
What is 0.321 moles of Sn?
This molecular geometry describes NCl₃.
What is trigonal pyramidal?
This type of bond forms when electrons are shared unequally.
What is a polar covalent bond?
This compound has more moles of oxygen: 2.3 mol H₂O or 1.2 mol H₂O₂.
What is 1.2 mol of H₂O₂?
This describes the solubility of Ag₂SO₄.
What is soluble?
This is the number of moles in 38.5 mg of Na.
What is 0.00167 moles of Na?
This describes whether NCl₃ is polar or nonpolar.
What is polar?
This factor explains why H–F is polar but F–F is not.
What is electronegativity difference?
This is the number of moles in 56.3 mg of NaCl.
What is 0.000963 moles of NaCl (9.63 × 10⁻⁴ mol)?
This is the net ionic equation for Cr(NO₃)₃ + Na₂S.
What is 2 Cr³⁺ (aq) + 3 S²⁻ (aq) → Cr₂S₃(s)?
This is the number of sodium atoms in 38.5 mg of Na.
What is 1.01 × 10²¹ atoms of Na?