"Chemical Properties of Metals" Metal PPT Courseware 6

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"Chemical Properties of Metals" Metal PPT Courseware 6

chemical properties of metals

1. Reaction of metal and oxygen

2. Research on the sequence of metal activities

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?

discuss

1. Can all metals react with oxygen?

2. Do you know the conditions under which they react with oxygen?

Life application

1. Magnesium and aluminum react with oxygen at room temperature. Why does aluminum have good corrosion resistance?

Aluminum reacts with oxygen in the air, forming a dense aluminum oxide (Al2O3) film on its surface, thereby preventing further oxidation of aluminum.

2. Analyze the chemical principle behind "real gold is not afraid of fire".

Experiments show that most metals can react with oxygen, but the difficulty and intensity of the reaction vary.

1. Reaction between metal and oxygen

Magnesium and aluminum can react with oxygen at room temperature.

Iron and copper cannot react with oxygen at room temperature, but they can react with oxygen at high temperatures.

Gold does not react with oxygen even at high temperatures.

Mobility: Magnesium, Aluminum > Iron, Copper > Gold

2. Reaction of metals and acids

discuss:

1. Can all metals react with acids?

2. Do they react with acid with the same intensity?

Activities and Inquiries:

Reaction of metals and acids

Add a small amount of magnesium ribbon, zinc granules, iron powder, and copper sheets to the test tube respectively, and then add a small amount of dilute hydrochloric acid or sulfuric acid respectively. Observe whether each group of substances reacts, whether there are bubbles, whether there is any heat generation, what the reaction speed is, and complete the reaction. equation.

Phenomenon:

1. When zinc, magnesium and iron are put into dilute sulfuric acid, bubbles will appear.

2. No bubbles will be produced when copper and silver are placed in dilute sulfuric acid.

3. Magnesium reacts fastest with dilute sulfuric acid, followed by zinc, and iron reacts slowly.

Comparison of chemical equations for the reactions of magnesium, zinc, iron and acids

Mg + 2 HCl == MgCl2 + H2↑

Mg + H2SO4 == MgSO4 + H2 ↑

Zn + 2HCl == ZnCl2 + H2 ↑

Zn + H2SO4 == ZnSO4 + H2 ↑

Fe + 2HCl == FeCl2 + H2 ↑

Fe + H2SO4 == FeSO4 + H2 ↑

Element + compound == another compound + another element

3. Reaction of metals and compound solutions

Recall: What happens when an iron nail is dropped into a copper sulfate solution?

Phenomenon: Red substance will precipitate on the surface of the iron nail. If the time is long enough, the solution will change from blue to light green.

The chemical equation for this reaction:

Fe + CuSO4 = Cu + FeSO4

Can you draw general rules for reactions between metals and compound solutions?

Summary:

1. Chemical properties of metals:

(1) Most metals can react with O2

(2) Most metals can react with dilute HCl or dilute H2SO4

(3) Some metals can react with solutions of metal compounds

2. Methods to determine the reactivity of common metals

(1) The intensity of the reaction between metal and acid

(2) Can metals react with solutions of metal compounds?

(3) How easy it is for metals to react with oxygen

3. Displacement reaction

Elemental substance + compound - new elemental substance + new compound

practise:

1. Determine whether the following substances can react? If possible,

Write the relevant chemical equation.

(1) Silver and dilute hydrochloric acid (2) Zinc and copper sulfate solution

(3) Copper and zinc sulfate solution (4) Aluminum and silver nitrate solution

(5) Silver and copper chloride solution (6) Magnesium and ferrous sulfate solution

Answer: Reactive: (2) (4) (6)

Chemical equation:

(2)Zn + CuSO4 = Cu + ZnSO4

(4)Al +3AgNO3 = Al(NO3)3 + 3Ag

(6)Mg + FeSO4 = MgSO4 +Fe

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. X, Y, and Z are three metals. According to the following chemical equations, the activity order of the three metals is ( )

①Z+YSO4==ZSO4+Y ②X+ YSO4==XSO4+Y

③X+ H2SO4== XSO4+ H2 ↑ ④Z+ H2SO4 does not react

A, Z>X>Y B, Z>Y>X

C. X>Y>Z D. X>Z>Y

3. The following chemical changes are displacement reactions ( )

(1) CO+Fe2O3→Fe+CO2

(2) C＋Fe2O3 → Fe＋CO2

(3) H2O2 → H2O＋O2

(4) Fe+AgNO3 → Fe(NO3)2+Ag

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Update Time: 2024-11-19

This template belongs to Chemistry courseware Beijing Curriculum Reform Edition Ninth Grade Chemistry Volume 2 industry PPT template

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