"Several Common Salts" Salt PPT Courseware 3

Description

"Several Common Salts" Salt PPT Courseware 3

Knowledge review

Knowledge point 1 Sodium chloride

1. Sodium chloride is a ________ crystal. It is soluble in water and has a salty taste. Its melting point is 801°C and its boiling point is 1413°C. The solution is ____ and is the main component of _____.

2. Sodium chloride is widely distributed in nature, and ______, ______, ______, and ______ are rich in sodium chloride.

3. Coarse salt purification:

(1) Steps: ①_______, ②_______, ③_______.

(2) The role of the glass rod in each step:

①______________; ②______________;

③_______________________________.

4. Sodium chloride is not only available for _____ and _____, but is also an important _____ raw material. It can be used to prepare ______, ______, ______, _______, and can be indirectly used to produce plastics, synthetic fibers, pesticides, and medicines. wait.

Knowledge point 2: Sodium carbonate, sodium bicarbonate, calcium carbonate

1. Sodium carbonate (Na2CO3)

(1) Common name: _________;

(2) Properties: _____ crystal, weathered into powder, ____ soluble in water, ____ heat during the dissolution process, the aqueous solution shows _____ properties;

(3) Source: salt lake or alkaline soil;

(4) Usage: Chemical raw materials, used in the production of glass, paper, textile and detergents, etc.

【Notice】

① When the saturated solution of sodium carbonate precipitates into crystals, the crystals will combine with a certain number of water molecules, and the chemical formula is Na2CO3·10H2O;

②The water molecules in the crystal are called crystal water, and the substances containing crystal water are called crystal hydrates, such as: CuSO4·5H2O—blue alum, bile alum; KAl(SO4)2·12H2O—alum;

③Normal salt is the product of complete neutralization of acid and alkali, such as sodium carbonate, etc. Acid salt is the product of partial hydrogen in acid being neutralized, such as sodium bicarbonate, etc.

2. Sodium bicarbonate (NaHCO3)

(1) Common name: _________;

(2) Properties: tiny ______ crystals, ____ soluble in water, the aqueous solution is ____, and more alkaline than sodium carbonate solution ____;

(3) Usage: baking cakes, treating hyperacidity, and raw material for fire extinguishing agents.

3. Calcium carbonate (CaCO3)

(1) The main components of marble and limestone;

(2) Properties: ______ solid, ____ soluble in water;

(3) Usage: building materials, calcium supplements, cement raw materials, ironmaking slag forming agents;

(4) In industry, limestone is calcined at high temperature to produce _______, and the chemical equation of the reaction is ____________________.

Example analysis

►Type 1 Common uses of salt

Proposition perspective: Test students’ understanding of common uses of salt.

Example 1 Regarding salt, which is common in life, which of the following statements is wrong ( )

A. Calcium carbonate can be used as a calcium supplement

B． Soda ash is often used in agriculture to improve acidic soil

C. Table salt can be used to season and pickle vegetables, fish, meat, etc.

D． Baking soda is one of the main ingredients of baking powder used in baking pastries.

[Analysis] A. Calcium carbonate can react with hydrochloric acid in gastric juice to form soluble calcium chloride, which is absorbed by the body, so it can be used as a calcium supplement. Correct

B. Hydrated lime is commonly used to improve acidic soil in agriculture. Soda ash is widely used in the production of glass, papermaking, textiles, detergents, etc., and is also often used in the food industry, so it is wrong; C. Salt is an important flavoring agent and can be used for seasoning. and pickled vegetables, fish, meat, etc., correct; D. Baking soda is one of the main ingredients of baking powder used in baking pastries, correct;

So choose: B.

[Variation question] A white substance is often used in steaming steamed buns and fried dough sticks. It can not only neutralize the acid produced during the fermentation process, but also cause foaming. This white substance is ( )

A. NaOH B. NaHCO3

C. Ca(OH)2 D. NaCl

►Type 2: Coarse salt purification

Proposition perspective: Test students’ mastery of coarse salt purification.

Example 2: Table salt is an important condiment. Refined salt is purified from coarse salt. The operations that are usually not required during the purification process are ( )

A. Evaporate b. adsorption c. Filter D. Dissolve

[Analysis] The operation process of crude salt purification is dissolution, filtration, and evaporation, and no adsorption operation is required, so choose B.

►Type 3: Reaction between sodium carbonate, etc. and hydrochloric acid

Proposition perspective: Examine students’ mastery of the reactions between common salts and hydrochloric acid.

Example 3 In order to test whether a certain stone contains carbonate, the following experiment was carried out (see the picture for the device); first add stone sample fragments to the Erlenmeyer flask, then add a certain amount of dilute hydrochloric acid, observe the experimental phenomenon, and draw conclusions. Try answering the following questions.

(1) The substance that should be added to the test tube is ____________;

(2) If ______ is observed in the Erlenmeyer flask and _______________ appears in the test tube, it proves that the stone contains carbonate;

(3) If the substance containing carbonate is calcium carbonate, please write the chemical equation that occurs in the Erlenmeyer flask: ____________________________.

[Analysis] (1) The test sample reacts with dilute hydrochloric acid to produce CO2 gas. Clear lime water that can react with CO2 and become turbid should be added to the test tube;

So the answer is: clarified lime water;

(2) When carbonate reacts with dilute hydrochloric acid, a large amount of gas CO2 is produced, so bubbles can be observed in the Erlenmeyer flask; the CO2 gas entering the test tube can make the clarified lime water turbid, so clarification can be observed in the test tube. The lime water becomes turbid; so the answer is: bubbles; clarified lime water becomes turbid;

(3) Calcium carbonate reacts with hydrochloric acid to produce CaCl2, H2O and CO2 gases; therefore the answer is: CaCO3+2HCl�CaCl2+CO2↑+H2O.

Keywords: salt teaching courseware, several common salt teaching courseware, Beijing curriculum reform version of the ninth grade chemistry PPT courseware download, ninth grade chemistry slide courseware download, salt PPT courseware download, several common salt PPT courseware download, .PPT format;

For more information about the PPT courseware "Salt: Several Common Salts", please click on the Salt ppt: Several Common Salts ppt tag.

"Several Common Salts" Salt PPT Courseware 2:

"Several Common Salts" Salt PPT Courseware 2 Salt is the product of the neutralization of acid and alkali. It is formed by combining the acid anion in the acid and the metal cation in the base. Thinking: Is the salt we are talking about now the table salt we usually eat? It is not that salt is a class of substances that includes...

"Several Common Salts" Salt PPT Courseware:

"Several Common Salts" Salt PPT Courseware 1. Sodium chloride (the main component of table salt) 1. Physical properties: white crystal, easily soluble in water (its solubility does not change much with temperature). 2. Preparation method: Generally, the solvent evaporation method is used. 3. Usage: kitchen condiment..

File Info

Update Time: 2024-10-02

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

Preview