Which of the following reactions is a precipitation reaction?HNO₂ (aq) + NaOH (aq) → NaNO₂ (aq) + H₂O (l) 2 C₂H₅OH (l) + 7 O₂ (g) → 4 CO₂ (g) + 6 H₂O (l) 2 H₂O₂ (l) → 2 H₂O (l) + O₂ (g) FeSO₄ (aq) + K₂S (aq) → FeS (s) + K₂SO₄ (aq)

Which tool is least in predicting weather

Consider hydrogen in an excited state n = 5n=5 that emits photons to reach the ground state. there are various possible transitions other than straight to the ground state that can occur; for example, it can drop to the n = 3n=3 state followed by the n = 3n=3 to the ground state transition. which of the possible transitions will result in the emission of a photon in the visible region?

Which type of intermolecular force is pbr3