شرح ساينس الصف الثالث الاعدادي لغات
شرح ساينس 3 اعدادي

لينك تحميل الملزمة
https://drive.google.com/file/d/1F3N85wNYA_Jgr9dma4aBgky0o3gn2hgH/view?usp=sharing

لينك تليجرام
https://t.me/mrahmedelbashagroup

In This Video :

Chemical reactions differ in the speed of their occurrence, where there are:
1. Very fast reactions
• They occur in very short time.
•Ex.: Fireworks.
2. Relatively slow reactions
• They occur in short time.
• Ex.: The reaction of oil with caustic soda (NaOH) to form soap .
3. Very slow reactions
• They need several months to occur.
• Ex.: Rusting of iron.
4. Too slow reactions
• They need millions of years to occur.
• Ex.: Reaction of petroleum oil formation inside the Earth.
The concept of the speed of the chemical reaction
► The following graph represents the speed of a chemical reaction :

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