Free Printable WorksheetScienceGrade 11Science CurriculumAP Chem Unit 9; NGSS HS-PS1-7 and HS-ETS1-2 connections; CCSS HSN-Q.A.1-3 and HSA-CED.A.2

11.111 Oxidation States and Electron Transfer Worksheet

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Worksheet Overview & Skills Covered

Core academic competencies and curriculum alignment

This Chemistry Science worksheet provides structured practice on 11.111 Oxidation States and Electron Transfer. Students are guided through targeted exercises that build foundational understanding, computational accuracy, and critical thinking skills.

Oxidation States and Electron Transfer: Assign oxidation numbers and identify oxidation, reduction, oxidizing agents, reducing agents, and electron transfer. Aligned to NGSS, CCSS, AP Chemistry/Pre-AP Chemistry, and representative state chemistry framework crosswalks - AP Chem Unit 9; NGSS HS-PS1-7 and HS-ETS1-2 connections; CCSS HSN-Q.A.1-3 and HSA-CED.A.2 - Oxidation States and Electron Transfer Chemistry Standards Crosswalk: National: AP Chem Unit 9; NGSS HS-PS1-7 and HS-ETS1-2 connections; CCSS HSN-Q.A.1-3 and HSA-CED.A.2. State frameworks: MA HS-PS1-10(MA); FL SC.912.P.8.10; TX TEKS 112.43(c)(9); GA and VA oxidation-reduction/electrochemistry standards; CA/NY/NJ engineering-energy connections.

Whether you are an educator preparing classroom handouts, a tutor reinforcing weekly topics, or a parent supporting homeschool learning, this printable resource gives students the deliberate practice required to achieve subject fluency and master state standards.

Grade

Chemistry

Subject

Science

Domain

Science Curriculum

Formats

PDF & DOCX

Sample Practice Problems

Preview the types of problems and questions covered in this worksheet

Below are sample questions representative of the exercises included on this worksheet and related 11.111 Oxidation States and Electron Transfer skill assessments:

Problem 1Difficulty: Mastery

For the reaction 2Al + 3I2 -> 2AlI3, which statement gives both agents correctly?

AAl is reduced and is the oxidizing agent; I2 is oxidized and is the reducing agent.

BAl is oxidized and is the reducing agent; I2 is reduced and is the oxidizing agent.

CAl and I2 are both oxidized because a compound forms.

DNo redox occurs because aluminum iodide is neutral.

Solution & Explanation:Al changes from 0 to +3, so it is oxidized and is the reducing agent. Iodine changes from 0 to -1, so I2 is reduced and is the oxidizing agent.

Problem 2Difficulty: Mastery

An electrolysis diagram shows liquid water between two electrodes, H2 bubbles at one electrode and O2 bubbles at the other. Which redox statement is correct?

AHydrogen is reduced from +1 to 0, and oxygen is oxidized from -2 to 0.

BHydrogen is oxidized from +1 to 0, and oxygen is reduced from -2 to 0.

CBoth hydrogen and oxygen are reduced because gases form.

DNo redox occurs because water only changes physical state.

Solution & Explanation:Hydrogen in water has oxidation state +1 and becomes 0 in H2, so it is reduced. Oxygen in water is -2 and becomes 0 in O2, so it is oxidized.

Problem 3Difficulty: Mastery

In the reaction 2Cu+ -> Cu2+ + Cu(s), which description is correct?

ACu+ is only oxidized because Cu2+ forms.

BCu+ is only reduced because Cu(s) forms.

CCu+ disproportionates because some Cu+ is oxidized and some is reduced.

DNo redox occurs because all species contain copper.

Solution & Explanation:Cu+ becomes Cu2+ in one product, which is oxidation, and Cu(s) in the other product, which is reduction. That is disproportionation.

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QWhat grade level and standards does this worksheet align with?

This worksheet is designed specifically for Chemistry Science students. It aligns with educational standard AP Chem Unit 9; NGSS HS-PS1-7 and HS-ETS1-2 connections; CCSS HSN-Q.A.1-3 and HSA-CED.A.2 (National: AP Chem Unit 9; NGSS HS-PS1-7 and HS-ETS1-2 connections; CCSS HSN-Q.A.1-3 and HSA-CED.A.2. State frameworks: MA HS-PS1-10(MA); FL SC.912.P.8.10; TX TEKS 112.43(c)(9); GA and VA oxidation-reduction/electrochemistry standards; CA/NY/NJ engineering-energy connections.).