Exploring Chemical Formulas and Molecular Models

Why are two-letter state abbreviations useful?

• They are more descriptive.

• They are more official.

• They are shorter and easier to use.

• They are easier to remember.

What do chemical formulas show us?

• The state of matter of the compound.

• The taste of the compound.

• The elements in a compound and the relative numbers of atoms.

• The color of the compound.

Tags

NGSS.MS-PS1-1

What is the molecular formula for water?

• H3O

• H2O

• H2O2

• HO

Tags

NGSS.MS-PS1-1

What is the empirical formula for glucose (C6H12O6)?

• C2H4O2

• CH2O

• C3H6O3

• C6H12O6

How do you find the empirical formula from a molecular formula?

• By multiplying the subscripts.

• By finding the greatest common factor of the subscripts.

• By adding the subscripts.

• By subtracting the subscripts.

What does a structural formula show?

• The connectivity and possibly the geometry of the atoms.

• The color of the atoms.

• The taste of the compound.

• The state of matter of the compound.

Tags

NGSS.MS-PS1-1

What is the molecular formula for ethanol?

• C3H8O

• C2H5OH

• CH3OH

• C2H6O

Tags

NGSS.MS-PS1-1

What do ball-and-stick models show?

• The connectivity, geometry, and relative sizes of the atoms.

• The state of matter of the compound.

• The color of the atoms.

• The taste of the compound.

Tags

NGSS.MS-PS1-1

What is a potential drawback of space-filling models?

• They do not show connectivity.

• They are not accurate.

• They are not useful for large molecules.

• They can hide certain atoms depending on the viewing angle.

Which model provides the most accurate geometric representation of a molecule?

• Ball-and-stick model

• Structural formula

• Space-filling model

• Empirical formula

Tags

NGSS.MS-PS1-1