شرح ساينس الصف الثاني الاعدادي لغات - الفصل الدراسي الاول
شرح ساينس تانية اعدادي - ترم اول

لينك تحميل الملزمة
https://drive.google.com/file/d/1SeXg1OOLmWsw_NQy9zbXWO7x-AV3OxfV/view?usp=sharing

لينك تليجرام
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in this lesson:
The opposite figure shows the combustion reaction of carbon in the presence of oxygen gas to form carbon dioxide gas.
Scientists thought of shortening this description of the chemical reaction into a simpler description known as the word equation in which:

Symbolic equation
It is a symbolic representation of the chemical reaction, showing the reactants and the products by using symbols and molecular formulas, with the simplest integer ratio between the numbers of atoms or molecules entering and resulting from the reaction.

Catalyst
A substance that increases the speed of the reaction without being consumed or changed.

Some reactions are carried out by heating, and some are carried out in the presence of a catalyst, while in acid reactions, the acid is either dilute or concentrated.
The following table showing the symbols which express the reaction conditions:

Law of conservation of matter
Matter is neither destroyed nor created from nothing, but it is transformed from one form to another.

Law of conservation of mass
It is one of the branches of the law of conservation of matter which is formulated by the scientist Lavoisier :

Law of conservation of mass
The total mass of the substances involved in the chemical reaction is equal to the total mass of the substances resulting from it.

بالتوفيق
مستر احمد الباشا