"Integration Improvement at the End of Chapter" Iron Metal Material PPT

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"Integration Improvement at the End of Chapter" Iron Metal Material PPT

Part 1: Method 1 Commonly used methods for chemical calculations - conservation method

[Typical Example 1] Add 100mL of 1mol/L hydrochloric acid to a certain amount of Fe, FeO, and Fe2O3 mixture, just enough to completely dissolve the mixture and release 224mL of gas (under standard conditions). No red color appears when KSCN solution is added to the obtained solution. The mass fraction of iron element in the mixture is ()

A. 81.4% b. 77.8%

C． 68.6% D. Unable to calculate

[Analysis] After dissolving the mixture with hydrochloric acid, add KSCN solution to the obtained solution. No red color appears, indicating that the solute in the obtained solution is ferrous chloride, that is, all the iron elements in the mixture ultimately exist in the form of ferrous chloride. , the amount of HCl is 1mol/L×0.1L=0.1mol. According to the conservation of chlorine element, n(Fe)=n(FeCl2)=12×n(HCl)=0.05mol, m(Fe element)=0.05 mol The amount is 0.01 mol × 2 = 0.02 mol, then the amount of HCl reacting with the oxide is 0.1 mol - 0.02 mol = 0.08 mol, so the oxide contains n(O) = 0.08 mol (O)=0.04mol×16g/mol=0.64g, then the mass fraction of iron in the mixture is 2.8g2.8g+0.64g×100%≈81.4%, item A is correct. [For training]

1. In a mixed solution composed of sulfuric acid, alum and aluminum sulfate, c(Al3+)=0.3mol•

L-1, c(SO2-4)=0.7mol·L-1, c(H+)=0.1mol·L-1, then c(K+) is ()

A. 0.15mol·L－1B． 0.2mol·L－1

C． 0.3mol·L－1 D. 0.4mol·L－1

2. After mixing 3.6g carbon powder and 29g magnetite powder with a mass fraction of Fe3O4 of 80%, isolate the air and increase the heat. The gas collected after the full reaction is ()

A. CO2

B. CO

C． A mixture of CO and CO2, in which the volume of CO accounts for 1/2

D. A mixture of CO and CO2, of which CO accounts for 2/3 of the volume

3. (2019·Xi'an High School Grade 1 Test) Under certain conditions, when the ratio of the number of XO-4 and H2O2 molecules in the solution is exactly 2:5, XO-4 in the solution is reduced to a lower valence state, and the valence of the X element becomes for()

A. +2 B. +3

C． +4 D. +5

Integrate and improve PPT at the end of the chapter, part 2: Method 2, a common method of chemical calculation—difference method

Typical Example 2 The ratio of the amount and concentration of SO2-4 substances is ()

A. 1:4B． 2:7

C． 1:2 D． 3:8

[For training]

4． After passing 4.48L (standard conditions) CO2 through a certain mass of solid Na2O2, 3.36L (standard conditions) gas is collected, then the mass of this 3.36L gas is ()

A. 3.8g b． 5.6g

C． 4.8g D． 6.0g

Integrate and improve PPT at the end of the chapter, the third part: Method 3 Commonly used methods for chemical calculations - relational expression method

[Typical Example 3] Use CO to reduce 10.0g of a certain magnetite sample (the impurities contained do not participate in the reaction), and the generated CO2 reacts with excess lime water to obtain 12.8g of precipitation. Find the mass fraction of Fe3O4 in the magnetite.

[For training]

6． When a mixture of divalent metal carbonates and bicarbonates reacts with a sufficient amount of hydrochloric acid, the ratio of the H+ consumed and the CO2 produced is 6:5, then the carbonate and bicarbonate substances in the mixture The ratio of the quantities is ()

A. 1:1B． 1:2

C． 1:3 D. 1:4

7． The four metal elements Mg, Zn, Al, and Fe react with sufficient amounts of dilute sulfuric acid respectively. The relationship between the amount of H2 released and the mass of the metal input is as shown in the figure. Then the metals represented by ①②③④ are ()

A. Al, Mg, Fe, Zn B. Fe, Zn, Mg, Al

C． Mg, Al, Zn, Fe D. Zn, Fe, Mg, Al

Keywords: Free download of the PPT courseware for high school chemistry compulsory course 1 from the People's Education Press, end-of-chapter integration and improvement PPT download, ferrous metal materials PPT download, .PPT format;

For more information about the PPT courseware "Integrating and Improving Ferrous Metal Materials at the End of the Chapter", please click the Integrating and Improving ppt Ferrous Metal Materials at the End of the Chapter ppt tag.

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Update Time: 2024-08-07

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