Which two elements are most likely to form a covalent bond?

• C and Ca

• P and F

• Sr an S

• Li and Cl

• Al and I

Draw the best electron dot structure for PCl₃. How many pairs of non-bonded (lone pair) electrons are there on P?

• Zero

• One

• Two

• Three

Tags

NGSS.HS-PS1-1

Draw the best structure for the sulfite ion SO₃^2- that fits the octet rule, including any reasonable resonance structures. What is the overall bond order for the S-O bond? (Hint: a single bond has a B.O. = 1, double = 2 etc.)

• Bond order = 2.5

• Bond order = 1

• Bond order = 2

• Bond order = 1.33

• Bond order = 1.5

Choose the electron dot diagram that correctly shows the bonding in methane CH_4.

• A

• B

• C

• D

Tags

NGSS.HS-PS1-2

Choose the electron dot diagram that correctly shows the bonding for the nitrite ion, NO₂^-:

• A

• B

• C

• D

• E

Tags

NGSS.HS-PS1-1

What is the formal charge on oxygen for the hydronium ion H₃O⁺?

• +3

• +1

• -2

• -3

• 0

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which of the following compounds contains BOTH ionic and covalent bonds?

• NaCl

• Li₂CO₃

• CO₂

• MnO₂

• HCN

Draw the best structures for the following covalent compounds: C₂H₂, C₂H₄ and C₂H₆. Which of these has the LONGEST C-C bond?

• C₂H₂

• C₂H₄

• C₂H₆

• Cannot be determined from the information given

• All of these structures will have the same C-C bond length.

Choose the electron dot diagram that correctly shows the bonding in H₂N₂:

• A

• B

• C

• D

• E

Tags

NGSS.HS-PS1-4

Draw the best electron dot structure for the sulfate ion SO₄^2- that follows the octet rule. What is the formal charge on sulfur in this structure?

• 0

• +1

• -1

• +2

• -2