AP Chemistry Unit 2 Review

Front

What type of intermolecular force is present in H₂CO?

Back

Dipole-dipole forces are present in H₂CO due to its polar nature.

Front

What is the molecular geometry of BF₄⁻?

Back

Tetrahedral.

Front

Why does the melting point of metals increase across period 3 from Sodium (Na) to Aluminium (Al)?

Back

Increased number of valence electrons contributed to the electron 'sea', increasing the charge of each metal cation.

Front

What is the shape of a molecule with a trigonal pyramidal geometry?

Back

A molecule with a trigonal pyramidal geometry has one atom at the apex and three atoms at the base.

Front

Which of the following is NOT a form of a metallic bond?

Back

Ionic bond.

Front

Define dipole-dipole forces.

Back

Dipole-dipole forces are attractive forces between the positive end of one polar molecule and the negative end of another polar molecule.

Front

What is the significance of valence electrons in metallic bonding?

Back

Valence electrons are delocalized in metallic bonding, creating a 'sea of electrons' that allows metals to conduct electricity.

Front

What is the difference between trigonal planar and trigonal pyramidal geometries?

Back

Trigonal planar has all atoms in the same plane, while trigonal pyramidal has one atom above the plane formed by the other three.

Front

Explain the concept of metallic bonding.

Back

Metallic bonding is the electrostatic attraction between positively charged metal ions and delocalized electrons.

Front

What is the effect of increasing atomic size on melting points across a period?

Back

As atomic size decreases across a period, the melting point generally increases due to stronger attraction between ions and delocalized electrons.