4.1 Quiz Review

Molecular Formula = C₂F₆

Choose the correct empirical formula.

• CF

• C₂F₆

• C₃F

• CF₃

Which pair has the same empirical formula?

• NaCrO₄ and Na₂Cr₂O₇
• C₂H₄O₂ and C₆H₁₂O₆
• C₃H₆O₃ and C₂H₆O₂
• CH₄ and C₂H₆

Empirical Formula = CF₂

Molecular formula mass = 200.04 g/mol

Molecular Formula = ?

• C₄F₈

• C₈F₄

• C₃F₆

• C₂F₄

Molecular Formula = Si₂F₆

Choose the correct empirical formula.

• SiF

• Si₂F₆

• SiF₃

• Si₄F₁₂

How would you calculate the molar mass for C₄H₆?

• 12.0111 + 1.00794

• 4(12.0111) + 6(1.00794)

• 2(12.0111) + 3(1.00794)

• 6(12.0111) + 4(1.00794)

The empirical formula of a substance is CH₂O. The molar mass is 180.18g/mol. What is the molecular formula?

• CH₂O

• C₃H₆O₃

• C₆H₁₂O₆

• C₁₂H₆O₁₂

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

• 2
• 8
• 6
• 18

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Hydrogen being an exception to the octet rule, needs _____ electrons in its outer energy level to be stable.

• 4

• 6

• 8

• 2

Three pairs of electrons are shared in a

• Single bond
• Double bond
• Triple bond

Draw the Lewis structure for F2. Which of the following is the correct Lewis dot structure for the molecule F₂?

• A

• B

• C

• D

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2