"Diversity of Iron" Properties and Transformation of Matter PPT (Lesson 1 Ferrous Salts and Iron Salts)

Description

"Diversity of Iron" Properties and Transformation of Matter PPT (Lesson 1 Ferrous Salts and Iron Salts)

Part One: Learning Objectives

Curriculum Standards

1. Understand that scientific inquiry is a scientific practice activity for scientific explanation and discovery, creation and application.

2. Understand the scientific inquiry process including core elements such as raising questions and hypotheses, designing plans, conducting experiments, obtaining evidence, analyzing and explaining or constructing models, forming conclusions, and communicating and evaluating.

3. Combined with application examples in real scenarios or through experimental exploration, we can understand the main properties of ferrous salts and iron salts and their applications in production and life.

core competencies

1. Awareness of scientific inquiry and innovation: Be able to start from problems and hypotheses, design an inquiry plan, and conduct experimental inquiry based on the properties of ferrous and iron salts and the purpose of the experiment.

2. Scientific attitude and social responsibility: Through discussing the existence of various iron-containing substances, you can have a preliminary understanding of iron products and their existence.

Diversity of iron PPT, part 2 content: Knowledge point 1 The existence of iron element

1. Iron content: The content in the earth's crust is second only to 1___________ three elements.

2. The existence form of iron element in nature

(1) Free state: exists in 2___________;

(2) Compound state: It mainly exists in the ore in the 3____________________ compound state. The ores containing iron in nature include 4________, 5________, 6________, etc.

3. There are many substances containing iron in daily necessities. For example, the main component of iron pots is 7___________, iron supplement health products contain 8___________, red paint on walls contains 9___________, laser printer toner contains 10___________, etc.

use as you learn

1. Chemistry has been closely related to production and life since ancient times. Which of the following statements is correct ()

A． When drinking iron supplements (containing Fe2+), it is more effective to add vitamin C because vitamin C has oxidizing properties.

B． In "The Tenth Day of Yellow and White", "Zeng Qing painted iron, and the iron was as red as copper" mainly caused a substitution reaction.

C. "Sinan's ladle (spoon), throw it to the ground, its ladle (spoon handle) guide", the "ladle" in Sinan contains Fe2O3

D. The "lime" in "Tiangong Kaiwu" in "All lime can be refined by fire" refers to Ca(OH)2

2. Put 10 g of iron-carbon alloy into O2 and burn it at high temperature. Pass the reacted gas into excess lime water to precipitate 1.4 g. Then this iron-carbon alloy is (known: the carbon content of low carbon steel is less than 0.25%, the carbon content of medium carbon steel is between 0.25% and 0.60%, and the carbon content of high carbon steel is greater than 0.60%) ()

A． Pig iron b. High-carbon steel

C. Medium carbon steel D. Low-carbon steel

Diversity of Iron PPT, Part 3: Knowledge Point 2 Ferrous Salts and Iron Salts

1. Ferrous salts are salts containing 1________ in their composition, such as 2________, 3________, 4________, etc. Iron salts are salts containing 5________ in their composition, such as 6___________, 7________, 8________, etc.

2. Predictions and assumptions about the properties of ferrous and iron salts

3. Experimental program

(1) It is proved that 9______ has strong oxidizing property and 10______ agents need to be added, such as iron, copper, zinc, etc.

(2) It is proved that 11______ is only reducing, and 12______ agent needs to be added, such as dilute sulfuric acid, copper sulfate solution, etc.

(3) To prove that 13______ has oxidizing properties, it is necessary to add 14______ agents, such as Zn, etc.; to prove that it has reducing properties, it is necessary to add 15______ agents, such as chlorine water, acidic KMnO4 solution, etc.

4. Experimental content, phenomena and conclusions

It is known that: Fe3++3SCN-===Fe(SCN)3, the reaction between Fe3+ and SCN- makes the solution appear red.

(1) Experimental study on the oxidation property of Fe3+ (taking FeCl3 as an example)

(2) Experimental study on the reducing properties of Fe

(3) Experimental study on the oxidation and reduction properties of Fe2+

5. Testing methods for Fe2+ and Fe3+

(1) Inspection of Fe2+

The sample solution ��→dropwise added KSCN solution 27___________→→dropped chlorine water or hydrogen peroxide solution becomes 28______, proving that it contains Fe2+.

(2) Inspection of Fe3+

The sample solution ��→ after adding KSCN solution dropwise, the solution becomes 29___________, proving that it contains Fe3+.

Troubleshooting

Chemical properties of ferrous salts and iron salts

(1) Add a few drops of KSCN solution into the FeCl2 solution. There is no obvious phenomenon. Then add chlorine water (or pass in Cl2). The solution turns red, proving that Fe2+ has reducing properties. Reaction principle: 2Fe2++Cl2===2Fe3++2Cl-.

(2) A salt solution containing Fe3+ turns red when exposed to KSCN solution.

(3) When H2S gas is passed into the FeCl3 solution, yellow turbidity appears, proving that Fe3+ is oxidizing. Reaction principle: 2Fe3＋＋H2S===2Fe2＋＋S↓＋2H＋.

use as you learn

1. After dropping a few drops of KSCN solution into the test tube containing Fe2(SO4)3 solution, the solution appears ()

A． Colorless b. yellow

C. red d. light green

2. Please answer the following questions based on the experimental process shown below:

Fe2O3 solid → hydrochloric acid ①A solution → sufficient Fe powder, filter ②B solution

(1) Among reactions ①②, the redox reaction is __________ (fill in the number).

(2) After adding a few drops of KSCN solution into solution A, the observed phenomenon is _______________.

(3) Write the chemical equation of reaction ①: _______________________.

Write the ionic equation for reaction ②: ____________________________.

Iron Diversity PPT, Part 4: Qualification Examination Training

1. Idioms are treasures in the splendid culture of the Chinese nation. Many idioms contain rich chemical principles. The following idioms involve redox reactions: ()

A． The plan is finished B. tempered into a steel

C. The iron pestle becomes a needle D. Drops of water turn into ice

2. The substance that proves Fe3+ is oxidizing can be ()

A． Cu element B． FeCl2 solution

C. NaOH solution D. Chlorine

3. Iron is currently the most widely used metal material in the world. The incorrect statement about iron and its compounds is ()

A． The main component of magnetite is Fe3O4

B． Fe3+ appears red when meeting KSCN solution

C. Fe can burn in pure oxygen

D. Fe2+ ​​can be reduced to Fe3+ by reducing agent

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Update Time: 2024-10-24

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