"Elements, oxides and hydroxides of iron" Iron and its compounds PPT

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"Elements, oxides and hydroxides of iron" Iron and its compounds PPT

Part One Content: Establishment of Necessary Knowledge and Qualifications

1. Elemental iron

1. The presence of iron element

The content of iron in the earth's crust is second only to oxygen, silicon and ___, ranking ___.

Mainly exists in the form of ___-valent and ___-valent compounds.

2.Physical properties

Iron has _______ and _______. Iron can conduct electricity, but its conductivity is not as good as copper and aluminum. Iron is attracted to magnets.

3. Chemical properties of iron

(1) Reaction of iron with non-metallic elements, acids and salt solutions

①Chemical equation for the reaction between iron and chlorine: ____________________;

②The chemistry of the reaction between iron and weakly oxidizing S element under heating conditions

equation:____________;

③Ionic equation for the reaction of iron with dilute hydrochloric acid and dilute sulfuric acid:

__________________.

④The ionic equation of the reaction between iron and copper sulfate solution:

_______________.

(2) Experiment to explore the reaction between iron powder and water vapor

【Smart Judgment】

(1) Iron can react with liquid water or water vapor under heating conditions ()

Tip:×. Fe does not react with liquid water under heating conditions, but reacts with water vapor under high temperature conditions to generate Fe3O4 and H2.

(2) The function of wet cotton in the device where reduced iron powder reacts with water vapor is to generate water vapor ()

Tips:√. The moisture in wet cotton generates water vapor under high temperature conditions.

2. Important compounds of iron

1. Iron oxide

[Micro Tips] FeO and Fe2O3 are alkaline oxides, while Fe3O4 is not an alkaline oxide.

【Situation·Thinking】

Du Fu was a great poet of the Tang Dynasty. One of his masterpieces - "From Beijing to Fengxian County in Five Hundred Words" has a famous saying through the ages: "The wine and meat of Zhumen smell stinky, and there are frozen bones on the road." Why is it called "Zhumen"? "Woolen cloth?

Tip: In ancient times, the doors of the residences of princes and nobles were painted red with iron oxide to indicate nobility, and were called "Zhumen". Later, they were also used to refer to the homes of wealthy people.

2. Iron hydroxide (experiment to explore the generation and transformation of iron hydroxide)

Add a small amount of FeCl3 solution and FeSO4 solution to the two test tubes respectively, and then drop into each NaOH solution.

Elemental oxide hydroxide of iron PPT, part 2 content: Key capabilities and literacy formation

Knowledge point: Improvement of laboratory preparation equipment for Fe(OH)2

[Key points to clarify doubts]

1. Methods to prevent oxidation of Fe(OH)2

(1) Boil the distilled water used to prepare the solution to remove oxygen.

(2) Insert the tip of the rubber dropper containing the NaOH solution into the bottom of the ferrous salt solution in the test tube, and slowly squeeze out the NaOH solution.

(3) Fill the ferrous salt solution with protective gas, such as H2, N2, rare gases, etc.

(4) Add a protective layer on top of the ferrous salt solution, such as benzene, vegetable oil, etc.

2. Improvement of experimental equipment

【Think·Discussion】

(1) Why can white precipitate be observed for a long time when preparing Fe(OH)2 in the improved device ①?

Tips: Boil the distilled water used to prepare the solution to remove dissolved oxygen, and then seal it with benzene liquid to prevent air from dissolving. Insert a dropper filled with NaOH solution under the liquid surface and slowly squeeze out the solution. These operations can prevent Fe(OH)2 Contact with oxygen prevents it from being oxidized, so the white precipitate can be observed for a longer period of time.

(2) What is the reason why white precipitation can be observed for a longer period of time in the improved device ②?

Tips: The hydrogen generated by the reaction of iron powder and dilute sulfuric acid eliminates the air in the device. At the same time, the remaining hydrogen in the test tube acts as a protective gas, preventing Fe(OH)2 from contacting oxygen and preventing it from being oxidized, so it can be more efficient. A white precipitate is observed over a long period of time.

【Case Demonstration】

[Typical example] Ferrous hydroxide is unstable and is usually oxidized to iron hydroxide. Iron hydroxide is a brown or reddish-brown powder or dark brown flocculent precipitate or colloid. It is used to make pigments, medicines, and as a water purifier ( colloid), it can also be used as an arsenic detoxifier.

The following is a student's plan to prepare Fe(OH)2 white precipitate by reacting FeSO4 solution without Fe3+ and NaOH solution prepared with distilled water without O2. Please answer each of the following questions:

(1) Analyze the reasons why ferrous sulfate and ferrous hydroxide are easily oxidized. (Macroscopic identification and microscopic analysis)

(2) When preparing the above FeSO4 solution with ferrous sulfate crystals, a solid needs to be added. What is the solid? (Scientific inquiry and innovation awareness)

(3) What methods are commonly used to remove dissolved O2 in distilled water? (Scientific inquiry and innovation awareness)

(4) The operation to generate the white precipitate of Fe(OH)2 is to use a long dropper to absorb the NaOH solution without O2, insert it under the surface of the FeSO4 solution, and then squeeze out the NaOH solution. What is the reason for doing this? (Scientific inquiry and innovation awareness)

Keywords: Free download of the PPT courseware for high school chemistry compulsory course 1 of the People's Education Press, PPT download of elemental oxides and hydroxides of iron, PPT download of iron and its compounds, .PPT format;

For more information about the PPT courseware "Elementary Oxide of Iron Hydroxide Iron and Its Compounds", please click on the ppt tag of Elemental Oxide of Iron Hydroxide ppt Iron and its Compounds ppt.

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Update Time: 2024-07-05

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