"Chemical Fertilizer" Salt PPT Courseware

Description

"Chemical Fertilizer" Salt PPT Courseware

teaching objectives:

Knowledge and skills:

1. Understand the importance of chemical elements to plant growth and the types and functions of common chemical fertilizers

2. Understand the impact of chemical fertilizers and pesticides on the environment

3. Preliminarily master the simple identification method of chemical fertilizers

Process and methods:

Through experimental research, initially learn how to distinguish nitrogen, phosphorus, and potassium fertilizers.

Emotional attitudes and values:

Understand the impact of chemical fertilizers and pesticides on the environment, improve students' environmental awareness, and cultivate students' true emotions of attaching importance to agriculture, caring for the countryside, and ensuring the sustainable development of agriculture.

Teaching focus: How to apply the knowledge learned to solve practical problems

Teaching difficulty: identification of several common chemical fertilizers

Pre-study assignment communication:

1. The growth of crops requires a variety of elements, of which the demand is relatively large. The main elements that are often lacking in the soil are ________, ________, ________ and other elements. Common chemical fertilizers include ________, ________, ________, and ________.

2. Which of the following chemical fertilizers is not salt ()

A． NH4NO3 B. NH3·H2O C. NH4HCO3 D. (NH4)2SO4

3. (09 Fuzhou) When plants are deficient in nitrogen, their growth is slow and their leaves turn yellow. The chemical fertilizer that needs to be applied at this time is ( )

A． KCl B. NH4HCO3 C. K2CO3 D. Ca(H2PO4)2

4. The large-scale laser "Shenguang 2" developed in my country uses potassium dihydrogen phosphate (KH2PO4) crystal. Which of the following statements is correct: ( )

A． Potassium dihydrogen phosphate can also be used as a compound fertilizer B. Potassium dihydrogen phosphate is an oxide

C． Potassium dihydrogen phosphate contains hydrogen gas D. The phosphorus element in potassium dihydrogen phosphate has a valence of +4

2. The relationship between the use of chemical fertilizers and the environment

Chemical fertilizers are food for plants and the material basis for improving agricultural production. Reasonable application of chemical fertilizers plays an important role in increasing yield per unit area and continuously improving soil fertility. However, unreasonable application can also cause harm and cause pollution to the environment. Improper application of chemical fertilizers can cause:

(1) Pollution of water bodies (increased N and P content in water, resulting in eutrophication)

(2) Pollution of the atmosphere (emission of harmful gases such as NH3)

(3) Destroy the soil (making the soil acidified and hardened)

1. Nitrogen fertilizer

The role of nitrogen fertilizer:

Nitrogen is a component element of nucleic acids, proteins and chlorophyll in plants.

Nitrogen fertilizer can promote the growth of plant stems and leaves and make the leaves dark green.

Common nitrogen fertilizers:

Urea: CO(NH2)2

Ammonia: NH3·H2O

Ammonium salt: NH4HCO3, NH4Cl, (NH4)2SO4

Nitrates: NH4NO3, NaNO3

Knowledge accumulation:

①Although the air contains a large amount of nitrogen, plants can usually only absorb nitrogen in compounds and cannot directly absorb nitrogen in the air.

② Leguminous plants with rhizobia in their roots can convert nitrogen into nitrogen-containing compounds and absorb it.

③The method of converting nitrogen gas into nitrogen compounds is called nitrogen fixation.

2. Phosphate fertilizer

Phosphorus is a component element of many important compounds such as nucleic acids, proteins and enzymes in plants. It participates in various important metabolic activities and is closely related to plant cell division, production and transformation of organic matter. Phosphorus can promote crop growth, make the ears plump, and can also enhance cold and drought resistance.

Common phosphate fertilizers:

Phosphate rock powder: Ca3(PO4)2

Calcium magnesium phosphate fertilizer: phosphate of calcium and magnesium

Heavy superphosphate Ca(H2PO4)2

Superphosphate: Ca(H2PO4)2+CaSO4

practise:

1. Urea[CO(NH2)2] is a high-efficiency chemical fertilizer, which belongs to ( )

A.Nitrogen fertilizer B.Phosphate fertilizer C.Potassium fertilizer D.Compound fertilizer

2. When the following chemical fertilizers are mixed and ground with slaked lime, the one that can smell the smell of ammonia is ( )

A. Potassium chloride B. Potassium sulfate C. Superphosphate D.Ammonium sulfate

3. High temperature or violent impact will cause the chemical fertilizer ammonium nitrate to undergo a violent decomposition reaction, generate a large amount of gas, release a large amount of heat, and cause an explosion. It is known that the chemical equation of the ammonium nitrate explosion reaction is: 2NH4NO3=2N2↑+O2↑+4X, then the chemical formula of X is ________.

4. The rice lodging in a student’s hometown appeared to be lodging. Through investigation and research, he found that the main reason was the lack of _______ fertilizer (fill in the name of the element). He suggested that farmers apply an appropriate amount of plant ash or _______ (fill in the chemical formula). It was also pointed out that excessive application of plant ash will cause the soil pH to be greater than 7, which is _________ and is not conducive to the growth of rice.

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For more information about the "Chemical Fertilizer Salt" PPT courseware, please click on the Chemical Fertilizer PPT Salt PPT tab.

"Chemical Fertilizer" Salt Fertilizer PPT Courseware (Lesson 2):

"Chemical Fertilizer" Salt Fertilizer PPT Courseware (Lesson 2), 13 pages in total. Classification practice of knowledge points 1. Among the following chemical fertilizers, the one that can be distinguished from other chemical fertilizers in terms of smell is ( ) A. Ammonium bicarbonate B. Ammonium nitrate C. Potassium sulfate D. Potassium chloride 2. Among the following four chemical fertilizer samples ..

"Chemical Fertilizer" Salt Fertilizer PPT Courseware (Lesson 1):

"Chemical Fertilizer" Salt Fertilizer PPT Courseware (Lesson 1), 12 pages in total. Classification of knowledge points Knowledge point 1 Chemical fertilizers 1. Scientific application of chemical fertilizers is an important means to increase agricultural production. The following are nitrogen fertilizers: ( ) A.K2CO3 B.Ca(H2PO4)2 C.NH4HCO3 D..

"Chemical Fertilizer" Salt Fertilizer PPT Teaching Courseware:

"Chemical Fertilizer" Salt Fertilizer PPT teaching courseware, 41 pages in total. New Knowledge Learning Knowledge Point 1 Introduction to Chemical Fertilizers [Tips] (1) Compound fertilizers: refers to chemical fertilizers that contain ____________________ from the three nutritional elements of nitrogen, phosphorus and potassium. Such as KNO3, NH4H2PO4, etc. ..

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Update Time: 2024-07-07

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

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