| Category | Format | Size |
|---|---|---|
| People's Education Press Fifth Grade Science Volume 2 | pptx | 6 MB |
"Combustion and Fire Extinguishing" PPT courseware on changes in matter
Description
"Combustion and Fire Extinguishing" PPT courseware on changes in matter
1. Combustion conditions
Combustibles – Substances that can burn are called combustibles.
Activity 1: Prove that combustion requires oxygen
Experimental equipment: candles, glasses, matches
Experimental conclusion: combustion requires oxygen
Activity 2: Use a “paper box” to boil water
Notice:
Water covers the bottom of the carton
Safe use of matches and alcohol lamps
Boiling: Bubbles appear at the bottom of the carton
Ignition point: The lowest temperature required for combustibles to burn.
The ignition point of wood is approximately 260°C;
The ignition point of cotton is about 150°C;
The ignition point of ordinary paper is about 130℃
discuss:
Why do empty cartons burn? Will water cartons burn?
Experimental conclusion: Combustion requires the temperature to reach the ignition point
2. Principles of fire extinguishing
Let’s talk about the fire extinguishing methods and principles commonly used in the following situations.
Play it: In the Laboratory
Rules: The host asks a question and other students raise their hands to answer it.
Operation:
Discuss how "will-o'-the-wisps" appear? (Supplementary information: Phosphine gas, ignition point 38°C)
Complete the relevant exercises on P46-P49 in the exercise book
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For more information about the "Changes of Matter, Combustion and Fire Extinguishing" PPT courseware, please click on the "Changes of Matter ppt Combustion and Fire Extinguishing" ppt tag.
"Combustion and Fire Extinguishing" Changes in Matter PPT Courseware 2:
"Combustion and Fire Extinguishing" Changes in Matter PPT Courseware 2 Activity 1 Combustion of Matter Where is combustion used in daily life? Burnable substances Examples of use Liquefied petroleum gas Cooking, stir-frying Wood, leaves Boiling water, heating Candles Lighting Can...
"Exploring Combustion and Fire Extinguishing" PPT Courseware on Combustion 3:
"Exploring Combustion and Fire Extinguishing" Combustion Knowledge PPT Courseware 3 Learning Objectives 1. Knowledge and Skills: Use chemical science knowledge to explain some phenomena and causes of combustion and fire extinguishing in daily life. 2. Processes and Methods: Through understanding of combustion conditions and fire extinguishing Exploration activities on principles, etc..
"Exploring Combustion and Fire Extinguishing" PPT Courseware on Combustion 2:
"Exploring Combustion and Fire Extinguishing" PPT Courseware on Combustion 2 Preview 1. The definition of combustion. 2. Three conditions required for combustion. 3. Principles and methods of fire extinguishing. 1. Combustion definition: A violent oxidation reaction that produces light and heat between combustibles and oxygen. ..
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Update Time: 2024-06-27
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