"Chemical Properties of Metals" Metals and Metal Materials PPT Courseware 7

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"Chemical Properties of Metals" Metals and Metal Materials PPT Courseware 7

Some physical properties of metals

think:

1. Compared with iron, what are the excellent properties of aluminum?

2. Can aluminum products in daily life be scrubbed with steel brushes or sand? Why?

Aluminum can react with oxygen at room temperature 4Al+3O2 ==2Al2O3

A dense aluminum oxide film is formed on the surface to prevent further oxidation. Therefore, aluminum has good corrosion resistance.

[Exploration 1] The reaction between metal and oxygen

Review and discussion:

Ask students to recall in the chemical properties of oxygen, which reactions between metals and oxygen have we studied? Can you still recall the phenomenon of these reactions?

Experimental exploration:

A copper wire and a magnesium strip are burned in the air respectively and observe the phenomenon. What will happen if the copper is replaced with a gold ring?

Communication and discussion:

1. Do all metals react with oxygen?

2. Does the difficulty and intensity of the reaction with oxygen indicate the activity of the metal?

[Study 2] Reaction of metals with acids

Experimental exploration:

1. Put two small pieces of magnesium, zinc, iron and copper into four test tubes respectively, then add about 5 mL of dilute hydrochloric acid respectively, observe the phenomenon and compare the intensity of the reaction. If gas is generated, determine what gas is generated after the reaction? (Place a small burning stick at the mouth of the test tube for testing)

2. Use dilute sulfuric acid instead of dilute hydrochloric acid to conduct experiments and compare the phenomena that occur.

Communication and discussion:

1. Which metals can react with hydrochloric acid and dilute sulfuric acid? How violent was the reaction? What gas is produced after the reaction? Which metals cannot react with hydrochloric acid and dilute sulfuric acid? From this, what two categories can you classify metals into?

2. Regarding the reactions that can occur, if we analyze them from the perspective of the material categories of reactants and products, what are the common characteristics of these reactions? Which reaction type do they belong to? And please summarize the basic types of chemical reactions you have learned

3. Comparison of chemical equations for the reactions of magnesium, zinc, iron and hydrochloric acid

Mg + 2HCl == MgCl2 + H2↑

Mg + H2SO4 == MgSO4 + H2 ↑

Zn + 2HCl == ZnCl2 + H2 ↑

Zn + H2SO4 == ZnSO4 + H2 ↑

Fe +2HCl == FeCl2 + H2 ↑

Fe +H2SO4 == FeSO4 + H2 ↑

[Communication analysis and discussion]

Infer the experimental phenomenon based on the chemical equation of the reaction, and analyze the activity of the two metals in the equation?

1. Fe+CuSO4=Cu+FeSO4

Phenomenon: Red substances precipitate on the surface of Fe, and the solution gradually changes from blue to light green.

Metal activity of Fe and Cu: Fe>Cu

2. 2Al+Fe2(SO4)3=2Fe+Al2(SO4)3

Phenomenon: The solution gradually changes from yellow to colorless.

Metal activity of Fe and Al: Al＞Fe

3. Al and MgCl2 solutions do not react. Point out the metal activity of Mg and Al?

Metal activity of Mg and Al: Mg > Al

[Multiple choice question]

1. Which of the following substances cannot be produced directly by the reaction of metals and acids ( )

A. ZnCl2 B. CuSO4

C, FeCl2 D, Al2(SO4)3

2. If the iron piece is put into the following solution, the mass of the iron piece will increase ( )

A. Dilute H2SO4 B. FeSO4 solution

C. CuSO4 solution D. Dilute HCl

3. If the iron piece is put into the following solution, the mass of the solution will be reduced by ( )

A, HCl B, H2SO4 C, Na2 SO4 D, CuSO4

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Update Time: 2024-10-05

This template belongs to Chemistry courseware People's Education Press Ninth Grade Chemistry Volume 2 industry PPT template

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