Chemistry Semester Exam

Front

CO₂ has polar bonds but is a NON POLAR molecule. Why?

Back

Bond polarity or dipole moment between C and O atoms cancel.

Front

What is a covalent bond?

Back

A bond that shares electrons with non-metals.

Front

What is the oxidation number for the Carbon family?

Back

-/+4.

Front

What shape does a molecule of methane have?

Back

Tetrahedral.

Front

Which element could be represented by this dot diagram? (O)

Back

O.

Front

What is the definition of a polar molecule?

Back

A molecule with a net dipole moment due to the presence of polar bonds.

Front

What is the difference between ionic and covalent bonds?

Back

Ionic bonds involve the transfer of electrons, while covalent bonds involve the sharing of electrons.

Front

What is the molecular shape of water (H₂O)?

Back

Bent.

Front

What is the significance of the octet rule in chemistry?

Back

Atoms tend to bond in such a way that they have eight electrons in their valence shell.

Front

What is a Lewis dot structure?

Back

A diagram that shows the bonding between atoms of a molecule and the lone pairs of electrons.