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Quiz yourself on chemistry Lewis structures from your own notes

Upload a PDF, slide deck or photo of your notes and get multiple-choice, true/false or open questions with explanations for each Lewis structure.

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Why practice Lewis structures with questions

Drawing a Lewis structure is easy to follow on a worked example and hard to reproduce from memory, and most mistakes happen in the counting step before any bonds are placed. A Lewis structure chemistry quiz makes you build the answer yourself, then shows the reasoning when you miss a step.

Counting total valence electrons before placing any bonds
Applying the octet rule and its common exceptions, such as BF3
Calculating formal charge to choose the best structure
Drawing resonance forms for molecules like ozone

Example Lewis structure chemistry quiz questions

How many total valence electrons does CO2 have?16. Carbon contributes 4 and each oxygen contributes 6, so 4 + 6 + 6 = 16 electrons to place in the structure.

Does BF3 follow the octet rule in its Lewis structure?No. Boron ends with only six electrons around it because its three bonds use all of its valence electrons and it has no lone pairs to add.

What formula do you use to calculate formal charge?Formal charge = valence electrons − nonbonding electrons − ½ bonding electrons. The best structure gives each atom a formal charge as close to zero as possible.

How many total valence electrons does the ammonium ion, NH4+, have?8. Nitrogen has 5 and four hydrogens have 1 each, giving 9, and then you subtract 1 for the +1 charge.

Why does ozone (O3) have two resonance structures?Either terminal oxygen can take the double bond, so the real molecule is an average of both forms, with bond lengths between single and double.

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Built from your notes

Upload a PDF, DOCX, PPTX, text file or photo of a page, and the questions come from your own examples.

Three question types

Multiple-choice, true/false and open questions, each with an explanation of why the answer is right or wrong.

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How it works

Add your material

Upload slides, a PDF or photos of your chemistry notes that cover Lewis structures.

Choose a question type

Pick multiple-choice, true/false or open questions based on the kind of practice you need.

Check the explanations

After each answer, read the explanation to see whether the valence count, bonding or formal charge step went wrong.

DeckOwl reads your own material, so the questions follow the examples your instructor used in class, whether they came from a PDF, a slide deck or a photo of the whiteboard. Each question includes an explanation you can check against your notes.

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Frequently asked questions

How do I count valence electrons for a Lewis structure?

Add the valence electrons of each atom using its group number, then sum them for the whole molecule. For an ion, add one electron for each negative charge and subtract one for each positive charge.

Which Lewis structure exceptions do I need to know for chemistry class?

Common exceptions include molecules with an odd number of electrons, like NO, and central atoms that stay below an octet, like boron in BF3. Practicing these separately helps because they break the usual rule.

Can I export a Lewis structure quiz to Moodle?

Moodle XML and QTI 2.1 export are on the Pro plan at $14.99 per month, and PDF and DOCX export are on the Plus plan at $39 per year or $7.99 per month.

Do I need a credit card to try it?

No. The free plan includes 3 generations per month and browser study, so you can test it with your own notes before paying for anything.

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