Mr. Ahmed mabrouk second term 2011
Unit 1: Chemical Reactions
Lesson 1: Chemical Reactions ..................................
Lesson 2: Speed of the Chemical Reaction ............
Lesson 3: Solutions .................................................
Unit 2: Electric Energy and Radioactivity
Lesson 1: The Physical Properties of the Electric current
Lesson 2: The Electric Current and Cells ................
Lesson 3: The Radioactivity and the Nuclear energy
Unit 3: Genetics
Lesson 1: The Main Principles of Heredity .............
Lesson 2: Genes .....................................................
Unit 4: Structure and Function (Immune System and Hormones)
Lesson 1: Hormones in the Human Body ...............
Unit
1: Lesson 1: Chemical Reactions
Q: What is the importance of the chemical reactions in our life?
Chemical
reactions have a great importance in our life. For
example,
1- When gasoline is burnt in the car engines, it generates power which makes it move.
2- Plants food is resulted from the photosynthesis process which depends on the reaction of carbon dioxide with water.
3- Different types of medicine, fertilizers and artificial filers are examples of the outcomes of some chemical reactions.
+
It
is a reaction in which 
the
compound is broken up into simple substances by heat.
A
B
A + B
Exp. |
Observation |
Conclusion |
1- Decomposition of metal oxides |
Red mercury oxide decomposes by heat into mercury (silver) and oxygen rises |
2 HgO 2Hg + O2 |
2- Decomposition of metal hydroxides |
Blue copper hydroxide decomposes by heat to copper oxide (black) and water vapour |
C u(OH)2 CuO + H2O |
3- Decomposition of metal carbonates |
Green copper carbonate decomposes by heat to black copper oxide and carbon dioxide. |
C uCO3 CuO + CO2 |
4- Decomposition of metal sulfates |
Blue copper sulfate decomposes by heat into black copper oxide and sulfur trioxide. |
C uSO4 CuO + SO3 |
5- Decomposition of metal nitrates |
White sodium nitrates decompose by heat into yellowish white sodium nitrites and oxygen. |
2 |
NaNO3
2
NaNO2
+
O2
Lithium |
Li |
Potassium |
K |
Sodium |
Na |
Barium |
Ba |
Calcium |
Ca |
Magnesium |
Mg |
Aluminum |
Al |
Zinc |
Zn |
Iron |
Fe |
Tin |
Sn |
Lead |
Pb |
Hydrogen |
H |
Copper |
Cu |
Mercury |
Hg |
Silver |
Ag |
Gold |
Au |
A) Simple substitution reactions
They are reactions where the element which is more active substitutes the less active one.
The series of chemical activity
It is the arrangement of metals in descending order according to their chemical activity.
A + B C A C + B
Element Compound Compound element