Practice Problems Unit 4 Lesson 1

What is the correct Lewis Dot Structure for ammonia NH₃

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• 
• 
• 

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which is the correct lewis structure for carbon dioxide?

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• 
• 
• 

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

What is the formal charge on the oxygen atom at the top of this Lewis dot structure?

• 0

• -1

• +1

• -3

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

What is the formal charge on the phosphorus atom in this Lewis dot structure?

• 0

• -1

• +1

• -3

What is the formal charge on the bromine atom in this Lewis dot structure?

• -1

• +1

• -2

• +2

Tags

NGSS.HS-PS1-1

When forming bonds metals tend to __________.

• Lose electrons forming positive ions

• Lose electrons forming negative ions

• Gain electrons forming positive ions

• Gain electrons forming negative ions

How many total valence electrons are used in the lewis structure for H₂O?

• 8

• 18

• 17

• 7

Sulfur hexafluoride is an example of a molecule where the central atom violates the octet rule. This is also known as being_____________.

• hypervalent

• hypovalent

• hyperoctet

• hypoctet

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Match each chemical formula with the correct number for the total valence electrons.

• NO₂^-

• 18

• CCl₄

• 24
• CO₃^2-

• 48

• SF₆

• 32

Tags

NGSS.HS-PS1-1

After drawing the "skeleton" for SO₃ how many valence electrons have been used?

• 24

• 6

• 18

• 12