Grade 10 · Science · Chemistry

10th grade Oxidation and reduction: losing and gaining electrons worksheet

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Oxidation and reduction: losing and gaining electrons

Grade 10 Science Worksheet - Building Confidence

NameDate

Circle the best answer, or write your answer on the line.

In a battery, 5 zinc atoms each lose 2 electrons to become Zn²⁺. How many electrons are lost in all, Ari?
4 aluminum atoms each lose 3 electrons to become Al³⁺. How many electrons are lost in all, Bo?
As a nail rusts, 6 iron atoms each end up losing 3 electrons, becoming iron(III). How many electrons are lost in all, Esme?
4.
Using the tally, which particle is oxidized, Jun?
- Neither particle
- The Cu²⁺ ion
- The zinc atom
5.
Using the tally, where do zinc's two electrons go, Kira?
Use the picture in question 4.
- Off into the air
- To the Cu²⁺ ion
- To another zinc atom
6.
Using the tally, what does the Cu²⁺ ion become, Luz?
Use the picture in question 4.
- Zinc metal
- Copper metal
- A Cu⁴⁺ ion
7.
What is oxidation, Milo?
- Losing electrons
- Gaining electrons
- Gaining protons
8.
What is reduction, Noah?
- Losing some of its mass
- Gaining electrons
- Losing electrons
9.
Why do oxidation and reduction happen together, Pia?
- Lost electrons must go somewhere
- Atoms cannot be split into pieces
- Oxygen must be present
10.
What is the oxidation number of a pure element, such as Fe or O₂, Ren?
- −2
- +1
- 0

Oxidation and reduction: losing and gaining electrons. Every version has 10 questions, and the answer key prints on the second page.

I can say that oxidation is losing electrons and reduction is gaining them, and that they happen together.
I can assign simple oxidation numbers: elements 0, oxygen usually −2, ions their charge, sums to the overall charge.
I can explain rusting and a zinc–copper cell as electron transfer.
I can name the oxidizing and reducing agents and read half-reactions.

Standard: none (TX, FL)

oxidation: Losing electrons; the oxidation number goes up

reduction: Gaining electrons; the oxidation number goes down

oxidation number: A bookkeeping charge given to each atom

oxidizing agent: The substance that takes electrons and is reduced

anode: The electrode where oxidation happens

Your child added the number of atoms and the electrons each loses. Every atom loses that many, so multiply.

Your child kept oxygen's minus sign. The oxidation numbers must add to zero, so the other element takes the opposite sign.

Your child made the oxidation numbers add to zero. In an ion they add to the ion's charge.

What is the most common mistake with oxidation and reduction: losing and gaining electrons?

Your child added the number of atoms and the electrons each loses. Every atom loses that many, so multiply.

Are these 10th grade science worksheets free to print?

Yes. All 6 printable versions at each level are free to print, with the answer key, and no account is needed.

Every sheet you scan goes into your child’s record: dated, marked and ready for the year-end portfolio. Homeschool records