"Diversity of Iron" Properties and Transformation of Matter PPT (Lesson 2: The transformation relationship between iron, iron oxides and iron hydroxides, iron and its compounds)

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"Diversity of Iron" Properties and Transformation of Matter PPT (Lesson 2: The transformation relationship between iron, iron oxides and iron hydroxides, iron and its compounds)

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 situations or through experimental exploration, we can understand the main properties of iron, iron oxides and iron hydroxides, and understand their applications in production and life.

core competencies

1. Scientific inquiry and innovation awareness: Be able to start from problems and hypotheses, design an inquiry plan, and conduct experimental inquiry based on the properties of iron compounds and the purpose of the experiment.

2. Scientific attitude and social responsibility: By understanding the relationship between iron and human health, you can make correct value judgments on social hot issues related to chemistry, and participate in social practice activities related to chemical issues.

Diversity of Iron PPT, Part 2: Knowledge Point 1 Properties of Iron

1. physical properties of iron

Pure iron is a bright □1___________ metal with a density of 7.86 g·cm-3 and a melting point of 1 538 ℃. Pure iron has strong corrosion resistance, good ductility and thermal conductivity. Its electrical conductivity is worse than that of copper and aluminum, and it can be attracted to □2_______.

2. Chemical properties of iron (fill in the ionic equation or chemical equation)

Troubleshooting

(1) Fe reacts with Cl2 to generate FeCl3, and Fe reacts with hydrochloric acid to generate FeCl2.

(2) Iron forms rust in humid air at room temperature. Its main component is Fe2O3·xH2O, and the product of iron burning in pure oxygen is Fe3O4.

(3) The reaction between iron and sulfur vapor produces FeS instead of Fe2S3.

use as you learn

1. (2019•Yiliang No. 1 Middle School and Senior High School Monthly Examination) Which of the following statements about the reaction between iron and hydrochloric acid is incorrect ()

A． This reaction is a displacement reaction

B． Iron is a reducing agent

C. HCl is an oxidizing agent

D. The products are ferric chloride and hydrogen

2. (2019•Yangzhou Senior High School Survey) Iron and water vapor can react at high temperatures: 3Fe+4H2O(g)=====High temperature Fe3O4+4H2, this reaction belongs to ()

A． Displacement reaction B. decomposition reaction

C. Combination reaction D. metathesis reaction

Diversity of iron PPT, part 3 content: Knowledge point 2 Iron oxides and iron hydroxides

1. iron oxide

2. Iron hydroxide

Troubleshooting

(1) The composition of Fe3O4 can be expressed in the form of oxides as FeO·Fe2O3, that is, 13 iron has a +2 valence, and 23 iron has a +3 valence.

(2) After the Fe(NO3)2 solution is acidified, NO-3 has strong oxidizing properties under acidic conditions and will oxidize Fe2+ to Fe3+.

use as you learn

1. (2019•Yuanjiang No. 1 Middle School and High School January Examination) Which of the following experiments can prepare iron hydroxide precipitation ()

A． Direct heating of iron oxide and water

B． Passing water vapor through hot iron powder

C. Iron oxide is first dissolved with hydrochloric acid and then caustic soda solution

D. Add saturated ferric chloride solution drop by drop into boiling water

2. (2019·Foshan No. 1 Middle School and High School No. 1) The incorrect description of the color of iron and its compounds is ()

A． Reduced iron powder-silver white

B． Fe(OH)3——reddish brown

C. Fe(SCN)3 solution - red

D. FeSO4 solution - light green

Diversity of iron PPT, part 4 content: Knowledge point 3: Transformation relationship between iron and its compounds

1. The relationship between common iron and its compounds

2. Examination of the valence state of iron element in iron supplements

(1) Iron plays an important role in the human body. If the body is deficient in iron, 6___________ will occur. Severe iron deficiency can take 7________.

(2) Iron supplement oral liquid is a common iron supplement. In addition to iron-containing compounds, antioxidants (such as 8_______), sweeteners, flavors, etc. are often added.

(3)Experimental plan

use as you learn

1. After the following groups of substances react, the KSCN solution is added dropwise. The red one is ()

A． Add iron powder to CuCl2 solution

B． Add dilute sulfuric acid to FeO powder

C. Add a small amount of chlorine water to the solution obtained by reacting Fe with excess dilute hydrochloric acid.

D. Add excess iron powder to the solution obtained by reacting Fe(OH)3 with excess dilute hydrochloric acid.

2. A research study group conducted the following experiments to explore the iron in liquid iron supplements produced by a pharmaceutical company:

Ⅰ. Add 2 mL of liquid iron supplement to the test tube, add distilled water, and after shaking, the solution becomes clear and transparent; add KSCN solution dropwise, and the solution will appear light red. Student A believes that the iron content of this iron supplement is very low and is an unqualified product.

(1) Do you think Student A’s point of view is reasonable? ________.

Ⅱ. Student B thought that further research experiments should be conducted. He divided the solution obtained by Student A into three parts and added chlorine water, bromine water, and iodine water respectively. It was found that after adding chlorine water and bromine water, the solution turned red and the color deepened significantly. There was no obvious change in the color of the test tube after adding iodine water. please answer the following question:

(2) According to B’s above experiment, the iron in the iron supplement is ____________________.

(3) The reason why the KSCN solution appears light red when the KSCN solution is added dropwise to the iron supplement solution is: __________________.

(4) Please further infer based on the experimental phenomena of student B that the elements of chlorine and bromine can oxidize the element of iron into ________-valent iron, and the product of the reaction between Fe and I2 should be ________.

Iron Diversity PPT, Part 5: Qualification Examination Training

1. In order to prevent iron deficiency anemia, the body must ensure adequate iron intake. The "iron" here refers to ()

A． Elemental iron B. iron element

C. Iron hydroxide D. iron oxide

2. Rust contains iron oxides and iron hydroxides. Research has proven that the rust of ironware is related to oxygen and water vapor in the atmosphere. Among the following practices, the most beneficial to slowing down the rust of ironware is ()

A． After use, scrub the surface of the iron pot with water to clean the oil stains.

B． Coat an iron knife that has been left unused for a long time with Vaseline and store it in the air.

C. Fill the iron kettle with water and store it

D. Store spoons and shovels in a dark and humid place

3. Which of the following reactions does not involve a change in the valence state of iron? ()

A． Use iron powder to remove some ferric chloride impurities in the ferrous chloride solution

B． Iron burns in oxygen and its product is dissolved in hydrochloric acid to obtain two salts

C. Ferrous hydroxide is a white solid that quickly turns gray-green and eventually reddish-brown in the air.

D. Iron hydroxide decomposes upon heating

4. A healthy person weighing 50 kg contains 2 g of iron. These 2 g of iron do not exist in the form of elemental metal in the human body, but in the form of Fe2+ and Fe3+. Divalent iron ions (ferrous ions) are easily absorbed. When supplementing iron to an anemic person, ferrous salts containing ferrous ions should be supplemented, such as ferrous sulfate (FeSO4). Taking vitamin C can turn the iron ions (ferric ions) in food into ferrous ions, which is beneficial to the absorption of iron.

(1) Fe2+ABFe3+ is often transformed in the human body. Fe2+ in A acts as a _________ agent, and Fe3+ in B acts as a _________ agent.

(2) From the sentence "Taking vitamin C can turn the iron ions (ferric ions) in food into ferrous ions", it can be concluded that vitamin C acts as a _________ agent in this reaction and has _________ sex.

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Update Time: 2024-11-22

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