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El-Waha language schools
Chemistry department
American Diploma (10)
Work sheet (1)
Chemical formula
1) What is meant by :
Chemical formula ………………………………
……………………………………………………………………….
2) Write the chemical formula of the following compounds :
Magnesium oxide ………………………………………
Sodium sulphate ……………………………………….
3) Write the name of the following compounds :
Al2O3
……………………………….
KOH ………………………………..
H.W
1) Define : Emperical formula ……………………………………………
…………………………………………………………………….
2) Compound with molecular formula C8H10N2O4 . its emperical formula is
……………………………….
3) The chemical name of table salt NaCl is ……………………………..
4) The chemical formula of potassium phosphate is …………………
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El-Waha language schools
Chemistry Department
American Diploma (10)
Work sheet (2)
Calculation of chemical formula
1- What is meant by :
The mole : …………………………………………………………………….
………………………………………………………..
2- Calculate the mass of 3 moles of carbon monoxide CO .
(C=12 , O=16)
…………………………………………………………………………………..
………………………………………………………………………………….
3- Calculate the chemical formula of magnesium oxide produced from the
combustion of 0.48 gm of magnesium in air , given that the mass of the
produced magnesium oxide is 0.8 gm .
(Mg=24 , O=16)
…………………………………………………………………………………
…………………………………………………………………………………
………………………………………………………………………………….
…………………………………………………………………………………..
H.W
1) Define :
Avogadro’s number : ………………………………………………
………………………………………………………………
2) Calculate the mass of 12.04 X 1023 atoms of carbon .
(C=12)
………………………………………………………………………………..
………………………………………………………………………………..
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El-Waha language schools
Chemistry Department
American Diploma (10)
Worksheet (3)
The chemical equation
1) What is meant by :
a) Chemical equation : ………………………………………………………………
……………………………………………………………….
b) Neutralization reaction : …………………………………………………………
…………………………………………………………………
2) Balance the following equations :
a) Na + H2O
NaOH + H2
b) KI + Cl2
c) CuCO3
KCl
heat
+ I2
CuO + CO2
H.W
1) Write the following equations in an ionic form :
2KOH + H2SO4
K2SO4
BaCl2 + Na2SO4
2NaCl + BaSO4
Precipitate
+
2 H2O
2) Define :
Ionic equation : ………………………………………………………………
………………………………………………………………….
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El- Waha language schools
Chemistry Department
American Diploma (10)
Worksheet (4)
Calculations in balanced equations
1) Choose the correct answer :
a) The superscript ……… is written below the reactants or products which exist
in form of solution .
i- (s)
ii- (g)
iii- (aq)
iv- (l)
b) …….. is (are) from the conditions of chemical reaction .
i- pressure
ii- heat
iii- catalyst
iv- all
c) The arrow in the chemical equation points to ……………
i- condition of reaction
ii- reactants
iii- products
iv- catalyst
d) Ag+ (aq) + Cl—(aq)
AgCl (s) , is balanced equation because …………
i- no. of atoms are equal in both sides
ii- charges are equal in both sides
iii- no. of atoms and charges are equal in both sides
iv- charges are not equal in both sides
2) Write the scientific term for each of the following :
i- It is accurate concise description for the changes that take place in chemical
reaction .
……………………………………….
ii- Chemical equation in which some or all reactants and products are written
in the form of ions .
……………………………………….
iii- Reaction between acid and base to form salt and water …………………..
iv- Reactions between solutions of salts and accompanied by the formation
of a precipitate .
……………………………………….
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3) Change the following word equations into balanced symbolic equations
i- Hydrogen + nitrogen
ammonia
……………………………………………………………………………….
ii- Potassium chloride + silver nitrate
pot. nitrate + silver chloride
……………………………………………………………………………………
iii- Barium nitrate + sulphuric acid
barium sulphate + nitric acid
…………………………………………………………………………………
heat
iv- Iron + chlorine
iron (III) chloride
………………………………………………………………………………….
4) During combustion of iron in air , black iron oxide Fe3O4 is produced .
( Fe=56 , O=16 )
a- Write a balanced symbolic equation for this reaction
b- How many moles of oxygen are required to react with 1 mole of iron ?
c- How many grams of oxygen required to react with 28 gm of iron ?
H.W
The following equation represents the combustion of pentane C5H12
C5H12 (l) + 8 O2 (g)
5 CO2 (g) + 6 H2O (l)
1- What is the number of moles of carbon dioxide produced from the combustion
of 10 moles of pentane ?
2- What is the number of oxygen moles are required for the combustion of
1.44 gm of pentane?
( C=12 , H=1 )
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El- Waha language schools
Chemistry Department
American Diploma (10)
Worksheet (5)
Ionic Bond
1) Complete
a- Ionic bond is formed between ………. and …………
b- …………….. are very stable and do not undergo chemical reactions .
c- Metals lose electrons forming ……….. ions known as ……………
2) Define :
Chemical reaction ………………………………………………………
…………………………………………………………………..
3) Give reason for :
Ionic compounds conduct electricity
…………………………………………………………………………………….
……………………………………………………………………………………
H.W
1) Give reason for :
The melting point of ionic compounds is relatively high
……………………………………………………………………………………
……………………………………………………………………………………
2) Write the scientific term for each of the following :
a- It is electrostatic attraction occurs between +ve cations and –ve anions
………………………….
b- Group of elements which are very stable and do not undergo chemical
reactions
………………………….
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El-Waha language schools
Chemistry department
American Diploma (10)
Worksheet (6)
Covalent Bond
1) Complete :
a) Covalent bond is formed between ………………………….
b) The electronegativity difference between atoms forming ……… covalent bonds
equals Zero .
c) ……………. covalent bond is formed between two atoms , each shares by three
electrons while uni-covalent bond is formed between atoms , each shares by ….
……………..
2) Define :
Polar covalent bond : …………………………………………………………..
…………………………………………………………..
H.W
1) What is meant by :
Double covalent bond : ……………………………………………..
………………………………………………………………..
2) Give reason :
The bond in Cl2 molecule is called pure covalent bond , while the bond
in HCl is called polar covalent bond.
……………………………………………………………………………………….
………………………………………………………………………………………….
3) Draw the electronic representation of of the bonds in PCl5 according to the
octet rule.
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El-Waha language schools
Chemistry department
American Diploma (10)
Worksheet (7)
Other Types of Bonds
1) Choose the correct answer :
a. Bonds formed between water molecules with each other are …………….
1- ionic
2- covalent
3- hydrogen
4- metallic
b. The bond formed between NH3 and H+ in NH4+ ion is …………………..
1- ionic
2- pure covalent
3- coordinate
4- hydrogen
c. The compound that can not form hydrogen bonds is ……………………
1- H2S
2- H2O
3- HF
4- NH3
d. The bond formed between ions of Fe metal is ………………….
1- coordinate
2- ionic
3- hydrogen
4- metallic
2) Give reason for :
The boiling point of water is relatively high
………………………………………………………………………………….
………………………………………………………………………………….
H.W
1)
Classify the type of bond in the following :
One.
A piece of copper
Two.
Between water molecules
Three.
Hydronium ion
2)
Which compound of the following can not form H.bond between their
molecules :
a. CH3-NH2
b. CH3-O-CH3
c. H-Br
d.H-F
e. PH3
d. H-O-Cl
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El-Waha language schools
Chemistry department
American Diploma (10)
Work sheet (8)
Solutions
1)
Write the scientific term :
One)
The bond causes the increase in boiling point of water
Two)
The substance present in the solution in a large amount
Three)
Mixture in which the particles can be seen by naked eye
2)
Mention one example for each :
One)
Gas in gas solution
Two)
Solid in solid solution
Three)
The colloid solution
H.W
1)
What is meant by :
One)
Solute :
………………………………………………………………………….
Two)
True solution :
………………………………………………………………….
…………………………………………………………………...
2)
One)
Two)
Complete :
Milk is considered from ……………. Solution
Fats can be dissolved in ……………..
3)
Illustrate the steps of dissolving NaCl in water
………………………………………………………………………………………
………………………………………………………………………………………
………………………………………………………………………………………
………………………………………………………………………………………
………………………………………………………………………………………
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El-Waha language schools
Chemistry department
American Diploma (10)
Work sheet (9)
Acids
1)
Write the scientific term
One)
The process of preparation of sulphuric acid in industry
Two)
A sour taste substance turns blue litmus into red
Three)
Acids which produce two hydrogen ions 2H+
2)
Complete
a) CuO + 2HCl
…………. + …………..
b) Ca(OH)2 + CO2
…………. + ………….
Four)
………. acid is one of the solid acids , while nitric acid is one of
……………
H.W
1)
Write the molecular formula of the following :
a) Sulphuric acid
b) Phosphoric acid
c) Hydrochloric acid
d) Thiosulphate anion
2)
Classify the following acids according to their strength , basicity and origin
:
Sulphuric acid :
Acetic acid :
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