Selected Topics of ChemistryGENERAL HIGH SCHOOL

FOURTH SEMESTER

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IMPORTANT: This activity is essential for your learning process and it is a requirement

for the evaluation of the Learning Evidence of Stage 3, therefore you have to do it completely and correctly.

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Stage 3

Dimension 2. Comprehension.

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Oxidation-reduction.

The oxidation-reduction reactions are very important in our lives; this type of reactions happen in our organism such as the metabolism of food, cellular respiration, etc. In addition, they are present around us as shown in metal corrosion, the darkening of apples when you peel them, in combustion, etc.

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1. Individually, do a comprehensive reading of the topics corresponding to the oxidation-reduction processes in your textbook and take notes of the main ideas you find.

2. Create a document-type digital application, taking into consideration the next options (choose one): a. Word documentb. Online document from Gmail: Watch Google Drive Tutorialc. Document from Outlook, Hotmail or Institutional email: Watch

OneDrive Tutorial

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In the previously created document:

3. Elaborate a description table showing the definition and a few examples of these concepts:

a) Oxidation-reductionb) Oxidationc) Reductiond) Oxidation numbere) Oxidizing agentf) Reducing agent

g) How are oxidation and reduction identified on an oxidation number scale? Explain.

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Stage 3

Dimension 3. Analysis.

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What are oxidation numbers?

The oxidation numbers (or oxidation states) are used to know how many electrons are in an atom; these do not always match to the real charge of molecules, but it is possible to calculate the oxidation numbers of the atoms that are involved in a covalent or ionic bond.

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4. Analyze in detail the Rules of assignment of oxidation number provided below:

1. The oxidation number of the uncombined elements in their natural state have an

oxidation number of 0.

2. All of the elements in group IA (H, Li, Na, K, Rb, Cs, Fr) have an oxidation number of 1+ in their compounds.

3. All of the elements in group IIA (Be, Mg, Ca, Sr, Ba, Ra) have an oxidation number of 2+ in their compounds.

4. Hydrogen has an oxidation number of 1+ in its compounds, except in hydrides where the oxidation number is 1-, for example: NaH1-, CaH2

1-, AlH31-.

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5. The oxidation number of oxygen is 2-, except in peroxides where its oxidation number is 1-, for example: Na2O2

1-

6. The elements in group VIIA or halogens (F, Cl, Br, I) have an oxidation number of 1- in their binary compounds.

7. The sum of the oxidation numbers of the charges must always be 0.

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5. Copy the table below into the previously created document and determine the oxidation number of these elements or compounds.

a. Refer to the next link for further information: https://www.youtube.com/watch?v=aLtoDR9HvXI

H2O Na2S

O2 F2

KMnO4 K2SO4

CO2 H2SO4

KCl Li

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6. Carefully read the topic of the representation of the oxidation-reduction processes through chemical equations on your textbook and take notes of the main ideas you find.

7. From the previous reading and the note taking, analyze each of the equations that represent oxidation-reduction processes, which are shown in the table of the next slide.

a. Refer to the next link for further information: https://www.youtube.com/watch?v=ibJ3swECwMo

b. Then, copy the table into the document created in point 2 and answer correctly.

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Balance table of oxidation-reduction equations

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8. Add a front page to your document with the next information:

○ Your personal information

○ Teacher’s name

○ Title of Learning Unit

○ Stage

○ Title of project

○ Date and place

9. Convert the created document to a PDF file and upload it to the platform according to the requirements mentioned in the next slide.

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SUBMISSION REQUIREMENTS

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Include the information below in the created document:

a. Front page with your personal information

b. Description tablec. Oxidation number tabled. Balance table of oxidation-reduction

equations

Save your document using the following structure:

INICIALES_REQUISITO E3_UA.

Example:Ninfa Casas Hernández 🡪 NCH_REQUISITO E3_TSQ

Remember to save or download (only the online document) as PDF file.

Note: In the Evidence 3 section, you will submit 1 file with the Requirement activity and 1 file with the Learning Evidence.

Submit your learning evidence in the Evidence 3 section of the Nexus Platform according to the characteristics of your file as shown below:• As a PDF file: Click on the PC button and upload it. • As a OneDrive file: Click on OneDrive button, choose and upload it.

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If you have any questions, contact your teacher via the available communication means in the Nexus Platform.