《Chlorine》Chlorine and its compounds PPT

《Chlorine》Chlorine and its compounds PPT

Part One: Goals and Competencies:

1. Know the forms of chlorine and that it mainly exists in the ocean in the form of sodium chloride. (Macroscopic identification)

2. Be able to correctly state the physical properties of chlorine. (Macroscopic identification)

3. From the atomic structure characteristics of chlorine and the reaction of chlorine with metals and non-metals, we can understand that chlorine is a non-metallic substance with very active chemical properties. (Macroscopic identification and microscopic analysis)

4. Know the products of the reaction between chlorine gas and water, and be able to correctly list the main components of chlorine water (newly produced chlorine water and long-term chlorine water). (Macroscopic identification and microscopic analysis)

Chlorine PPT, part 2: independent preview to explore new knowledge

1. Physical properties of chlorine gas

1. Atomic structure and existence of chlorine

2. Physical properties of chlorine gas

2. Chemical Properties of Chlorine

1. Reaction of chlorine gas and metal elements

Write the chemical equation for the following reaction and indicate the main reaction phenomena:

(1) Reacts with sodium to produce a large amount of white smoke;

(2) Reacts with iron to produce a large amount of brown smoke;

(3) Reacts with copper to produce a large amount of brown smoke.

Micro tip: ① Chlorine can react with most metals, and generally oxidizes variable-price metals (such as Fe, Cu) to the highest price. ②Chlorine gas can react with many reducing compounds, such as FeCl2 solution, KI solution, SO2 aqueous solution, etc.

2. Reaction of chlorine gas and non-metallic elemental hydrogen

Ignite hydrogen gas in the air, and then extend the tube into the gas bottle containing chlorine gas.

(1) Phenomenon: Hydrogen ______ quietly in chlorine gas, emitting ______ flame, and ______ appears above the mouth of the gas collecting bottle.

(2)Chemical equation: ____________________.

3. Reaction of chlorine gas and water

(1) Newly produced chlorine water can sterilize and disinfect because chlorine reacts with H2O. The chemical equation of the reaction is ____________. Hypochlorous acid has strong oxidizing properties and can sterilize and disinfect.

(2) Hypochlorous acid

① Hypochlorous acid is a weak acid that is ______ different from water and ______ more acidic than carbonic acid. It cannot be broken down into ionic form when writing ionic equations. Ionic equation for the reaction of chlorine gas and water: ____________________________.

Chlorine gas PPT, the third part: core breakthroughs and difficult difficulties

Composition, properties and applications of chlorine water

1. Chlorine water ingredients

(1) Chemical reactions in chlorine water and ionization of substances

Cl2＋H2O===H＋＋Cl－＋HClO, H2O��H＋＋OH－, HClO��H＋ClO－, 2HClO=====Light 2HCl＋O2↑.

(2) The composition of chlorine water - "three molecules and four ions"

2. Properties of chlorine water

Chlorine water contains a variety of particles, so when it reacts with different substances, it exhibits different particle properties, as listed below:

[Typical example] Chlorine water contains a variety of components, so it has a variety of properties. Fill in the blanks according to the reactions of chlorine water with the four substances in the figure (the overlapping parts of a, b, c, and d represent reactions between substances, and the chlorine water is sufficient quantity).

(1) What can prove that chlorine water has bleaching properties is ________ (fill in “a”, “b”, “c” or “d”).

(2)The phenomenon in process c is_______________________________,

The ionic equation for the reaction in process b is ____________________.

(3)The chemical equation of the reaction in process a is ____________________.

Chlorine PPT, Part 4: Meeting standards in class and improving literacy

1. The schematic diagram of the atomic structure of chlorine element is . The following statement is correct ()

A. Chlorine atoms easily lose electrons during chemical reactions

B． Chlorine atoms can easily obtain electrons to form stable chlorine ions

C． The chemical valence of chlorine is only -1

D． Chlorine has 7 electrons outside its nucleus

B: There are 7 electrons in the outermost layer of the chlorine atom. It is easy to obtain 1 electron to form a chloride ion with a stable structure. B is correct. ]

2. Which of the following statements about chlorine is correct ()

A. Sodium burns in chlorine to produce white smoke

B． Red hot copper wire burns in chlorine to form CuCl

C． Pure hydrogen burns quietly in chlorine with a yellow flame

D． Injecting chlorine gas into vole holes to kill voles takes advantage of the toxic and dense properties of chlorine gas

D. Sodium in A burns in chlorine to produce small solid particles of NaCl, forming white smoke. No fog appears (fog is small droplets). A is wrong. The red-hot copper wire in B burns in chlorine to produce CuCl2. , B is wrong; hydrogen in C burns in chlorine and emits a pale flame, C is wrong; chlorine in D is poisonous, denser than air and can kill voles, D is correct. ]

3. The following chlorides can be produced by the direct combination of metals and chlorine, or by the reaction of metals and hydrochloric acid ()

A. CuCl2 B. FeCl2

C． NaCl D． FeCl3

C. Item A, copper does not react with hydrochloric acid, incorrect; item B, iron reacts with chlorine to form ferric chloride, and reacts with hydrochloric acid to form ferrous chloride, incorrect; item C, sodium reacts with chlorine or hydrochloric acid to form both Sodium chloride, correct; item D, according to the analysis in B, D is wrong. ]

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