AP Chemistry FRQs questions well
answered updated
Explain how the higher temperature affects the collisions between reactant molecules so that
the reaction occurs at an observable rate at 120°C. - correct answer ✔✔At higher temperature,
the particles have a greater average kinetic energy at the lower temperature. Thus there are
more collisions with sufficient energy to overcome the activation energy
Bond angle for bent molecular geometry - correct answer ✔✔104°-110°
IMFs in HCl - correct answer ✔✔hydrogen bonding, dipole-dipole
In a mixture of CCl₄ and HCl, CCl₄ condenses at 70°C while HCl remains in the gaseous state.
What can be inferred about the relative strengths of the IMF in CCl₄ and HCl? - correct answer
✔✔The IMFs in CCl₄ molecules must be stronger than those in HCl molecules because CCl₄
condenses at a higher temperature than HCl.
When formal charges can't be avoided, the negative formal charge should reside on what
element in the compound? - correct answer ✔✔the most electronegative element
HCNO(g) (fulminic acid) ⇌ HNCO(g) (isocyanic acid)
A student claims that ∆S° for the reaction is close to zero. Explain why the student's claim is
accurate. - correct answer ✔✔The change from fulminic acid to isocyanic acid is a
rearrangement of atoms with no change in phase of number of molecules
HCNO(g) (fulminic acid) ⇌ HNCO(g) (isocyanic acid)
answered updated
Explain how the higher temperature affects the collisions between reactant molecules so that
the reaction occurs at an observable rate at 120°C. - correct answer ✔✔At higher temperature,
the particles have a greater average kinetic energy at the lower temperature. Thus there are
more collisions with sufficient energy to overcome the activation energy
Bond angle for bent molecular geometry - correct answer ✔✔104°-110°
IMFs in HCl - correct answer ✔✔hydrogen bonding, dipole-dipole
In a mixture of CCl₄ and HCl, CCl₄ condenses at 70°C while HCl remains in the gaseous state.
What can be inferred about the relative strengths of the IMF in CCl₄ and HCl? - correct answer
✔✔The IMFs in CCl₄ molecules must be stronger than those in HCl molecules because CCl₄
condenses at a higher temperature than HCl.
When formal charges can't be avoided, the negative formal charge should reside on what
element in the compound? - correct answer ✔✔the most electronegative element
HCNO(g) (fulminic acid) ⇌ HNCO(g) (isocyanic acid)
A student claims that ∆S° for the reaction is close to zero. Explain why the student's claim is
accurate. - correct answer ✔✔The change from fulminic acid to isocyanic acid is a
rearrangement of atoms with no change in phase of number of molecules
HCNO(g) (fulminic acid) ⇌ HNCO(g) (isocyanic acid)
