Pre-AP CHEM Unit 6 Day 3 Review

Which of the following compounds has only single bonds?
I) N₂
II) O₂
III) H₂
IV) CH₄

• III, IV
• III only
• IV only
• I and II

Compounds with which of the following elements are exceptions to the octet rule in drawing Lewis structures?
H, Be, B, C, N, O, F

• H only
• H, Be, and B
• H, Be, B, and C
• C, N, O, and F

The PF₅ molecule exists, whereas NF₅ does not. Which one of the following is the BEST explanation for this fact?

• The first five ionization energies of nitrogen are too high, but those of phosphorus are not.
• Phosphorus has a lower electronegativity than nitrogen.
• PF₅ is polar, whereas NF₅ is not.
• Phosphorus can use d orbitals in bonding, whereas nitrogen cannot.

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-1

Draw the Lewis structure for the hydroxide ion, OH^-1.  What is the total number of valence electrons what does the charge imply?

• 8 valence electrons;
  an electron has been gained
• 6 valence electrons;
  an electron has been lost
• 6 valence electrons;
  an electron has been gained
• 8 valence electrons;
  an electron has been lost

Which is the correct Lewis structure of the chlorine atom and the ion it forms?

• A
• B
• C
• D

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-1

Which of the following is the correct Lewis structure of magnesium chloride?

• A
• B
• C
• D

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-1

Which of the following is the correct Lewis formula for molecular oxygen (O₂)?

• A
• B
• C
• D

Tags

NGSS.HS-PS1-2

Which of the following is the correct Lewis formula for molecular fluorine (F₂)?

• A
• B
• C
• D

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-1

Draw the Lewis structure for a molecule of hydrogen cyanide (HCN).  How many single bonds, double bonds, triple bonds, and lone pairs of electrons are on the central atom?

• 1, 0, 1, 0
• 1, 1, 0, 1
• 2, 0, 0, 2
• 2, 1, 0, 0

Among the following molecules, which has the strongest bonds?

• N₂
• O₂
• CO₂
• F₂

Tags

NGSS.HS-PS1-3