Formal Charge
Authored by WAN ZAI AZLIN WAN AZIZ
Chemistry
10th - 12th Grade
NGSS covered
Used 266+ times
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About
This quiz focuses on formal charge calculations in molecular chemistry, specifically targeting the application of formal charge formulas to various Lewis dot structures and polyatomic ions. Appropriate for grades 10-12, this assessment requires students to master the fundamental concept that formal charge equals the number of valence electrons in an isolated atom minus the number of electrons assigned to that atom in a Lewis structure. Students must demonstrate proficiency in counting bonding electrons, lone pair electrons, and applying the formal charge equation FC = V - N - B/2, where V represents valence electrons, N represents non-bonding electrons, and B represents bonding electrons. The quiz systematically tests students' ability to analyze different molecular geometries including hydronium ions, carbonate resonance structures, and various compounds containing oxygen, nitrogen, phosphorus, bromine, and fluorine atoms. Created by WAN ZAI AZLIN WAN AZIZ, a Chemistry teacher in Malaysia who teaches grades 10 and 12. This quiz serves as an excellent formative assessment tool for students learning chemical bonding and molecular structure concepts. Teachers can deploy this assessment as a warm-up activity to gauge student readiness before advancing to resonance structures and molecular stability topics, or as homework reinforcement following initial instruction on Lewis dot structures. The quiz works particularly well as review material before unit exams covering chemical bonding, allowing students to practice the systematic approach required for formal charge calculations across diverse molecular examples. This assessment aligns with chemistry standards focusing on molecular structure and bonding, specifically supporting learning objectives related to electron distribution analysis and molecular representation through Lewis structures.
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Student View
10 questions
Show all answers
1.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
What is the formal charge on oxygen for the hydronium ion H3O+?
+3
+1
-2
-3
0
Tags
NGSS.HS-PS1-2
NGSS.HS-PS1-1
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the formal charge on the oxygen atom at the top of this Lewis dot structure?
0
-1
+1
-3
Tags
NGSS.HS-PS1-2
NGSS.HS-PS1-1
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the formal charge on the oxygen at the the bottom left in this Lewis dot structure?
0
+1
-1
-2
Tags
NGSS.HS-PS1-2
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the formal charge on the oxygen atom at the top of this Lewis dot structure?
0
+1
-1
-2
Tags
NGSS.HS-PS1-2
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the picture showing?
All of the resonance structures for carbonate.
The formal charge on each atom in carbonate.
The electronegativity for carbonate.
The ionization energy for carbonate.
Tags
NGSS.HS-PS1-2
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the formal charge on the bromine atom in this Lewis dot structure?
-1
+1
-2
+2
Tags
NGSS.HS-PS1-1
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Calculate the Formal Charge for the Nitrogen
Tags
NGSS.HS-PS1-2
NGSS.HS-PS1-1
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