MP3: Three weeks test AP chemistry

Front

Atoms of H only form _________ bonds.

Back

Single

Front

Which of the following compounds has only single bonds? HCN, CH₃COOH, C₆H₆, C₂H₆

Back

C₂H₆

Front

Which of the following statements supports the claim that the nitrate ion, NO₃⁻, has three resonance structures? The oxygen to nitrogen to oxygen bond angles are at 85 degrees. One of the bonds in the nitrate ion is shorter than the other. One of the bonds in the nitrate ion is longer than the other. The nitrate ion is NOT a polar species.

Back

The nitrate ion is NOT a polar species.

Front

According to the octet rule most elements need _______ valence electrons.

Back

8

Front

Which of the following is the correct Lewis structure for CH₂O? Option A, Option B, Option C, Option D

Back

Option D

Front

What is the octet rule?

Back

The octet rule states that atoms tend to gain, lose, or share electrons to achieve a full set of eight valence electrons.

Front

Define resonance in chemistry.

Back

Resonance refers to the way in which the structure of a molecule can be represented by two or more valid Lewis structures.

Front

What is a Lewis structure?

Back

A Lewis structure is a diagram that shows the bonding between atoms of a molecule and the lone pairs of electrons that may exist.

Front

What is the significance of bond angles in molecular geometry?

Back

Bond angles determine the shape of a molecule, which affects its reactivity and properties.

Front

What is a polar molecule?

Back

A polar molecule is a molecule that has a net dipole moment due to the presence of polar bonds and an asymmetrical shape.