شرح ساينس الصف الثالث الاعدادي لغات
شرح ساينس 3 اعدادي

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In This Video :
From the previous explanation, we can define the speed of chemical reaction as follows:
The speed of chemical reaction
It is the change in the concentration of the reactants and the resultants at a unit time.
Measuring the speed of the chemical reaction
The speed of a chemical reaction can be measured practically by the rate of:
• Disappearance of one of the reactants.
Or
• Appearance of one of the resultants.
The rate of reaction of sodium hydroxide solution with copper sulphate solution.
1. The nature of the reactants
The effect of the nature of the reactants depends on two factors which are:
A. The kind of bonding in reactants.
B. The surface area of reactants exposed to reaction.

A. The kind of bonding in reactants. The kind of bonding (ionic or covalent) in the molecules of reactants affects the speed of chemical reaction as in the following :
The reaction between sodium chloride solution and silver nitrate solution is from fast reactions. (G.R)
Because it takes place between ions that are resulted from dissociation of each of them in water.
B. The surface area of reactants exposed to reaction.
The surface area of the reactants exposed to reaction affects the speed of the chemical reaction as in the following:
The reaction of substance (A) with substance (B)



From the previous explanation, we conclude that:
As the surface area of the reactants exposed to reaction increases, the speed of chemical reaction increases

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