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

لينك تحميل الملزمة
https://drive.google.com/file/d/14rd4rlejpw87Xx6soIPwBRAR3lDpL7gM/view?usp=sharing

لينك تليجرام
https://t.me/mrahmedelbashagroup

in this lesson:
Physical change
A change in the state or shape of a substance without changing its chemical composition.

Chemical change
A change that results in new substances with chemical properties different from those of the original substances.

Chemical Reactions
Chemical changes occur as a result of chemical reactions between the original substances (reactants) that lead to the formation of new substances (products) which differ in their properties from the properties of the original substances.
Activity(1): The concept of chemical reaction
Materials and used tools :
• Baking soda (sodium bicarbonate). • Balloon.
• Vinegar (dilute acetic acid). • Empty bottle. • Spoon.
Steps:
1. Put two tablespoons of baking soda in the balloon.
2. Put a quantity of vinegar in the bottle.
3. Secure the opening of the balloon over the mouth of the bottle tightly.
4. Lift the balloon to pour baking soda into the bottle . . What do you observe

Observation :
The occurrence of effervescence and the evolution of gas bubbles that led to the inflation of the balloon as it became filled with gas.
Conclusion :
Chemical reaction occurs between baking soda (sodium bicarbonate) and vinegar (dilute acetic acid) causing the effervescence and the evolution of carbon dioxide gas.

Chemical reaction
The process of breaking the bonds between atoms of the reacting substances (reactants) and forming new bonds between atoms of the produced substances (products).

بالتوفيق
مستر احمد الباشا