Chemistry Semester 1 - 2024 (M)

Front

What is a dot diagram?

Back

A dot diagram, also known as a Lewis dot structure, represents the valence electrons of an atom. It shows how electrons are arranged around the nucleus and how they bond with other atoms.

Front

What is the molecular geometry of CO2?

Back

The molecular geometry of CO2 (carbon dioxide) is linear, meaning the atoms are arranged in a straight line.

Front

What is the molecular geometry for a molecule with 3 bonds and 0 lone pairs?

Back

The molecular geometry for a molecule with 3 bonds and 0 lone pairs is trigonal planar.

Front

What is the correct Lewis structure for water (H2O)?

Back

The correct Lewis structure for water shows the oxygen atom in the center with two hydrogen atoms bonded to it, and two lone pairs of electrons on the oxygen.

Front

What is an isotope?

Back

An isotope is a variant of a chemical element that has the same number of protons but a different number of neutrons, resulting in a different atomic mass.

Front

What is the significance of valence electrons in bonding?

Back

Valence electrons are the outermost electrons of an atom and are involved in forming bonds with other atoms. They determine the chemical properties of an element.

Front

Define molecular geometry.

Back

Molecular geometry refers to the three-dimensional arrangement of atoms within a molecule, which affects its physical and chemical properties.

Front

What is the difference between a polar and nonpolar molecule?

Back

A polar molecule has a net dipole moment due to the presence of polar bonds and an asymmetrical shape, while a nonpolar molecule has no net dipole moment and is symmetrical.

Front

What is the VSEPR theory?

Back

The Valence Shell Electron Pair Repulsion (VSEPR) theory predicts the shape of molecules based on the repulsion between electron pairs in the valence shell of the central atom.

Front

What is a covalent bond?

Back

A covalent bond is a chemical bond formed when two atoms share one or more pairs of electrons.