Review of Semester 1 2022

Front

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

Back

A trigonal pyramidal molecule has a central atom bonded to three other atoms and has one lone pair of electrons, resulting in a pyramid-like shape.

Front

What type of intermolecular force exists between HCl molecules?

Back

Dipole-Dipole forces are present between HCl molecules due to the polar nature of the H-Cl bond.

Front

Why do atoms get larger as you move down the periodic table?

Back

Atoms get larger because they have more energy levels, which means more electron shells are added as you move down the groups.

Front

Which element has the largest atomic radius among potassium, rubidium, francium, and cesium?

Back

Francium has the largest atomic radius due to its position in Group 1 and being the heaviest element in that group.

Front

What is the oxidation number of sulfur in sulfate (SO₄²-)?

Back

The oxidation number of sulfur in sulfate is +6.

Front

Define 'trigonal planar' molecular geometry.

Back

Trigonal planar geometry occurs when a central atom is bonded to three other atoms, all in the same plane, with bond angles of 120 degrees.

Front

What is the significance of dipole-dipole interactions in molecular compounds?

Back

Dipole-dipole interactions are significant as they influence the physical properties of molecular compounds, such as boiling and melting points.

Front

Explain the concept of atomic radius.

Back

Atomic radius is the distance from the nucleus of an atom to the outermost shell of electrons, which can vary based on the element and its position in the periodic table.

Front

What is the trend in ionization energy as you move across a period in the periodic table?

Back

Ionization energy generally increases as you move from left to right across a period due to increasing nuclear charge.

Front

What are London dispersion forces?

Back

London dispersion forces are weak intermolecular forces that arise from temporary dipoles in molecules, present in all molecular substances.