Understanding Molecular and Empirical Formulas

What does a molecular formula indicate about a compound?

• The simplest ratio of elements

• The chemical reactivity with water

• The physical properties like melting point

• The total number of each type of atom

Tags

NGSS.MS-PS1-1

How is an empirical formula derived from a molecular formula?

• By finding the molecular weight

• By calculating the molar mass

• By determining the compound's density

• By simplifying the ratio of atoms

What is the empirical formula of ethene if its molecular formula is C4H8?

• C4H8

• CH2

• C2H4

• C3H6

For the compound cyanotriazide with a molecular formula of C3N12, what is the simplified ratio of carbon to nitrogen?

• 1:4

• 1:3

• 3:12

• 1:2

What is the empirical formula for a compound with a molecular formula of C5H10O5?

• C1H2O1

• C2H4O2

• C5H10O5

• CH2O

If a molecular formula cannot be simplified, what is its empirical formula?

• It is always CH2

• It has no empirical formula

• It is the same as the molecular formula

• It is a single element

Which compounds share the same empirical formula CH2?

• C4H8, C2H4

• C3H6, C5H10, C6H12

• C2H6, C3H8, C4H10

• C2H4, C3H6, C5H10

What is the empirical formula of a compound with a molecular formula of P3N5?

• P3N5

• P1N2

• PN

• P2N3

Why might multiple different compounds have the same empirical formula?

• They have the same molecular weight

• They share the same simplified ratio of atoms

• They contain the same elements

• They react similarly with other chemicals

What does the empirical formula CH2 indicate about the ratio of hydrogen to carbon?

• Twice as much hydrogen as carbon

• Equal amounts of hydrogen and carbon

• Half as much hydrogen as carbon

• Three times as much hydrogen as carbon