the atom it is the smallest part of matter that can take part in chemical reactions without being...
Post on 18-Jan-2016
212 Views
Preview:
TRANSCRIPT
The atom
It is the smallest part of matter that can take part in chemical reactions without being changed
The atomic structure
The nucleus
The electrons
The nucleus contains two types of particles which are:
Protons Neutrons
How can we differentiate between atoms?
HeliumLithium
The atomic number:-
“ Is the number of protons inside the nucleus or the number of electrons rotates around the nucleus in the normal state of the atom”
The mass number:-
“ Is the number of protons and the number of neutrons inside the nucleus”
‘The atomic number= 3
‘The mass number= 7
Na Sodium atom
23
11
The mass number
The atomic number
So The number of protons in the sodium atom =
The number of electrons in the sodium atom =
The number of neutrons in the sodium atom =
11
11
12
Does the relation between living organisms takes place exactly like between non living substances?
Mother I love my cat so much Does the cats marry like us?
What will happen if
two families ( Egyptian and suddenness ) lived beside each others?
They will react together
This reaction may lead to a change in the structure of the two families
Explain
Is it possible that the man and the wife of each family get divorced?
Is it possible that the man of the Egyptian family marry the woman of the suddenness family and the vice versa?
What is the type of change happened in this case?
It is a change in the state, shape and color of the substances without changing in its electronic structure.
Ex.
Water into Ice
Water into vapour
Is a change in the structure and the properties of the substances through a chemical reactions
Ex.
Iron into iron sulphide
Hydrogen into water
Is a process in which bonds in reactants are broken and new bonds in products are formed
+A B C D C BA D +
The reactants The products
Chemical equationIs a set of symbols and chemical formulas that express the reactants, the products and the reaction conditions if they exist.
2Mg 2MgOheat+ O2
Practice on the balance of chemical equations
NO NO2+ O2
+CuO NO2 O2heatCu(NO3)2 +
heat 22
2 2 4
Types of chemical
reactions
Direct combination
reactions
Simple sub. reactions
Double sub .
reactionsDecomposition
reactions
Do all the chemical reactions occur by the same method?Do all the chemical reactions occur by the same method?
Direct combination reactions
A type of reaction in which two substances react together forming a new compound
A type of reaction in which two substances react together forming a new compound
AA BB++ ABAB
Types of direct Combination
reactions
Element combines with element
Element combines
with compound
Compound combines
with compound AB CD++ ABCD
A BC++ ABC
A B++ AB
Element combines withelement
What is the difference between basic oxide and acidic oxide?
G.R white powder is formed when magnesium strip is burned in the air?
heatAcidic oxide
2- C CO2+ O2
White powder
Basic oxide
1- 2Mg 2MgOheat+ O2
Element combines withcompound
2NO 2NO2+ O2 Brown fumes
G.R. Brown fumes are formed when nitric oxide gas is exposed to atmospheric air?
Think
Compound combines withcompound
NH3NH4Cl + HCl White fumes
G.R. White fumes are formed when ammonia gas is exposed to hydrogen chloride gas?
Think
Evaluation
2- 2NO ……+ O2
1- 2Mg 2MgO……+ …..
4- NH3…….+ HCl
3- C CO2+ O2……
Complete
Decompositionreactions
A type of reaction in which a substance decomposes into its elements or simpler substances by the effect of heat or electricity
AA BB++ABABheat
electricity
Types of direct Decomposition
reactions
Thermal decompositionreactions
The electrolysis reactions
AA BB++ABABheat
AA BB++ABABelectricity
Thermal decomposition reactions
A type of reaction in which a substance decomposes into its elements or simpler substances by the effect of heat only
AA BB++ABABheat
Examples of the Thermal decomposition reactions
3- CuCO3 CuO + CO2heat
2- CuSO4 CuO + SO3heat
5- +2CuO 4NO2 O2heat2Cu(NO3)2 +
heat6- 2NaNO3 2NaNO3 + O2
1-heat
2HgO 2Hg O2+
heat2- Cu(OH)2 CuO + H2O
The electrolysis reactions
Is a reaction in which the solution or the melt of the substance decomposes into its elements or simpler substances by electricity.
AA BB++ABABelectricity
The electrolyte
Is the substance which ionized in water into + and - ions
The voltammeter
Is the apparatus in which the electrolysis takes place.
Hoffman voltammeter
Is the apparatus which used in the electrolysis of acidified water.
2H2O 2H2 O2+electricity
Dil H2SO4
Uses 0f electrolysis
Getting elements from their compounds
Aluminum industry
electroplating
1
2
3
Simple substitutionreactions
Is a reaction in which a metallic element substitutes another metallic element in on of its salt solutions
ADAD CC++CDCDAA ++
The least active
The most active
The chemical activity seriesThe chemical activity series
Is the arrangement of the metallic elements in decreasing order according to their chemical activity
Types of simple Substitution
reactions
Metal sub. H of an acid
Metal sub. Another metal
AXAX H2H2++HXHXAA ++
ADAD CC++CDCDAA ++
Metal sub. H of an acid
Ex.
3- Cu + H2SO4 -ve
1- Mg MgSO4+ H2SO4 + H2dil
2- Zn ZnSO4+ H2SO4 + H2dil
dil
Metal sub. another metal in its salt solution
Ex.
1- Mg MgSO4+ CUSO4 + CU
2- Zn MgSO4+ CuSO4 + Cu
3- Cu + ZnSO4 -ve
Double substitutionreactions
Is a reaction in which the ions or the radicals of two compounds exchange its others forming two new compounds
ADAD CBCB++CDCDABAB ++
Types of DoubleSubstitution
reactions
Acid + alkali salt +water
Acid +salt Acid + salt
Salt +salt Salt + salt
Acid + Alkali Salt + water
Neutralization reactionEx.
* HCl NaCl+ NaOH + H2O
Acid + Salt Acid + Salt
Ex.
H2SO4 Na2SO4+ 2NaCl + 2HCl
H2SO4 Na2SO4+ Na2CO3 + H2O + CO2
Salt+ Salt Salt + Salt
Ex.
CuSO4 Na2SO4+ Na2S + CuS
NaCl NaNO3+ AgNO3 + AgCl
CuSO4 Cu(NO3)2+Ba(NO3)2 + BaSO4
Choose the correct answer
1- the substance which ionized in water into + and – ions
Acid Electrolyte Alkali
2- When sodium chloride solution is added to silver nitrate solution a……… ppt. is formed
BlackRed White
3-The exothermic reaction generates heat because
The heat content of the reactants greater than the products
The heat content of the reactants equal that of the products
The heat content of the reactants Smaller than the products
top related