U2L7 DE PS - Wed 10/8 - 2.6 Molecules and Molecular Compounds

What is the molecular formula for the compound shown in this structural formula?

• HO

• H₂O

• H₂O₂

• H₄O₂

Answer explanation

The structural formula indicates two hydrogen atoms and two oxygen atoms, which corresponds to the molecular formula H₂O₂, commonly known as hydrogen peroxide. The other options do not match this composition.

Tags

NGSS.HS-ESS2-5

What is the molecular formula for the compound shown in this structural formula?

• CH₄

• C₂H₄

• CH₃

• C₂H₆

Answer explanation

The structural formula corresponds to methane, which has one carbon atom and four hydrogen atoms, giving it the molecular formula CH₄. The other options do not match this composition.

What is the molecular formula for the compound shown in this structural formula?

• O

• O₂

• O₃

• O₄

Answer explanation

The structural formula indicates a molecule composed of two oxygen atoms, which corresponds to the molecular formula O₂. The other options, O, O₃, and O₄, do not represent the correct number of oxygen atoms in the compound.

What is the molecular formula for the compound shown in this structural formula?

• C₂H₅O

• C₂H₆O

• C₂H₄O

• CH₃O

Answer explanation

The structural formula indicates a compound with two carbon atoms, six hydrogen atoms, and one oxygen atom, which corresponds to the molecular formula C₂H₆O. This matches the correct answer choice.

What is the molecular formula for the compound shown in this structural formula?

• N

• N₂

• N₃

• NH₃

Answer explanation

The structural formula indicates a diatomic nitrogen molecule, which consists of two nitrogen atoms. Therefore, the correct molecular formula is N₂, representing nitrogen gas.

Tags

NGSS.HS-PS1-3

What is the molecular formula for the compound shown in this ball-and-stick model?

• HO

• H₂O

• H₂O₂

• H₃O

Answer explanation

The ball-and-stick model represents water, which consists of two hydrogen atoms and one oxygen atom. Therefore, the correct molecular formula is H₂O, indicating the presence of 2 hydrogens and 1 oxygen.

Tags

NGSS.HS-ESS2-5

What is the molecular formula for the compound shown in this ball-and-stick model?

• NH₂

• NH₃

• NH₄

• N₂H₃

Answer explanation

The ball-and-stick model represents ammonia, which has one nitrogen (N) atom and three hydrogen (H) atoms, giving it the molecular formula NH₃. The other options do not match this composition.

Tags

NGSS.HS-PS1-3

What is the molecular formula for the compound shown in this ball-and-stick model?

• CO

• CO₂

• 2CO

• C₂O₂

Answer explanation

The ball-and-stick model represents carbon dioxide, which consists of one carbon atom and two oxygen atoms. Therefore, the correct molecular formula is CO₂.

Tags

NGSS.MS-PS1-1

What is the molecular formula for the compound shown in this ball-and-stick model?

• HCl

• H₂Cl

• HCl₂

• Cl₂

Answer explanation

The ball-and-stick model represents a molecule with one hydrogen atom and one chlorine atom, which corresponds to the molecular formula HCl. The other options either have incorrect atom counts or combinations.

Tags

NGSS.MS-PS1-1

What is the molecular formula for the compound shown in this ball-and-stick model?

• C₃H₈

• C₄H₁₀

• C₄H₈

• C₅H₁₂

Answer explanation

The ball-and-stick model represents a molecule with 4 carbon atoms and 10 hydrogen atoms, which corresponds to the molecular formula C₄H₁₀. This is consistent with the structure of butane, confirming it as the correct choice.