"Several Important Salts" PPT courseware

Description

"Several Important Salts" PPT courseware

Part 1: What is salt?

Question: Is salt table salt?

Scientifically speaking, salt refers to a type of compound containing metal ions (including ammonium ions) and acid ions.

Sodium chloride: NaCl = Na+ + Cl-

Sodium carbonate: Na2CO3 = 2Na+ + CO3 2-

Calcium carbonate: CaCO3 = Ca2+ + CO32-

Copper sulfate: CuSO4 = Cu2+ + SO42－

Ammonium nitrate: NH4NO3 = NH4+ + NO3-

Several important salts PPT, part 2: properties of several salts

1. Sodium carbonate (soda ash or soda or baking soda, Na2CO3)

When sodium carbonate crystallizes from solution, a certain number of water molecules are incorporated into the crystal. The chemical formula is

Na2CO3·10H2O.

Such substances containing a certain number of water molecules are called crystalline hydrates.

At room temperature, in dry air, sodium carbonate crystals can gradually lose crystal water and become powder. This phenomenon is called weathering.

2. Calcium carbonate (CaCO3)

White and pure calcium carbonate rock is called white marble

Calcium carbonate with beautiful patterns due to impurities is called marble

Dense calcium carbonate rock (limestone) can be directly used in construction

The main use of limestone is in the production of cement

3. Sodium chloride (NaCl)

Sodium chloride is commonly known as table salt (the chemical name of table salt is sodium chloride). It is a white solid and easily soluble in water.

Table salt mainly comes from sea water. In some inland places, salt is produced from well water, and in some places there are dry salt lakes.

Salt and health

Each of us must consume a certain amount of salt every day to maintain the normal concentration of sodium chloride in the body. Excess sodium chloride in the body is excreted through sweat, urine and feces. If the body loses too much salt due to diarrhea, vomiting or excessive sweating, it is necessary to inject saline or take salt boiled water to maintain the salt in the body. However, if you consume too much salt every day, it will increase your blood pressure and endanger your health.

Thinking: Salt water is often used to clean wounds in daily life. Do you know why?

Because concentrated salt solution causes water in cells to leak out and solidify proteins, it has a bactericidal effect.

Several important salt PPT, the third part: preparation of salt

Salt can be divided into soluble salt and insoluble salt

Potassium sodium ammonium nitrate solution

Sulfuric acid insoluble barium (BaSO4)

Hydrochloric acid insoluble silver (AgCl)

Carbonic acid only dissolves ammonium, potassium, sodium and magnesium

Alkaline soluble ammonium potassium sodium barium calcium

People often use the solubility of some salts to achieve the preparation, purification and identification of substances.

Thinking: In addition to the neutralization reaction between acid and alkali to generate salt, what other methods are there to generate salt?

Activity: What phenomenon can be found when CaCl2 solution is added to a test tube containing Na2CO3 solution?

white precipitate produced

Thinking: What substances are produced when Na2CO3 solution reacts with CaCl2 solution?

The Na2CO3 solution reacts with the CaCl2 solution to form two new salts: NaCl and CaCO3.

Keywords: Zhejiang Education Edition ninth grade science PPT courseware free download, several important salt PPT download, .PPT format;

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

"Several Important Salts" PPT (Lesson 3):

"Several Important Salts" PPT (Lesson 3) Part One: Learning Objectives: 1. Understand the types and characteristics of chemical fertilizers. 2. Remember the composition characteristics of ammonium salts and the chemical properties and testing methods of ammonium salts. 3. Understand the properties of some common salts through experiments. ... ... ....

"Several Important Salts" PPT (second lesson):

"Several Important Salts" PPT (Second Lesson) Part One Content: Learning Objectives: 1. Learn to use the solubility tables of some acids, bases, and salts; 2. Know the metathesis reaction and understand the conditions of the metathesis reaction; 3. Understand Chemical properties of salt and preparation of salt..

"Several Important Salts" PPT (first lesson):

"Several Important Salts" PPT Part One Content: Learning Objectives: 1. Understand the difference between table salt and salt. 2. Understand the main properties and uses of the three salts NaCl, Na2CO3, and CaCO3. 3. Master the identification method of CO32-. ... ... ... Several important salt PPT...

File Info

Update Time: 2024-08-06

This template belongs to science courseware Zhejiang Education Edition Ninth Grade Science Volume 1 industry PPT template

Preview