Download 1-Write the scientific term

Science Department
1st prep.
Revision on Unit (1)
1-Write the scientific term:
1.
A bond that resulting from the electric attraction between a positive ion and a
negative ion. (……………………).
2. A bond resulting from the participation of each of the two atoms with three
electrons. (……………………).
3. The number of electrons gained, lost or even shared by an atom during a
chemical reaction. (……………………).
4. A set of atoms joined together, behave like one atom only, having a special
valence. (……………………).
5. A formula represents the number and type of atoms in a molecule.
(……………………).
6. Gas resulted from lightning. (……………………).
7. Compounds that dissolve in water producing positive hydrogen ions.
(……………………).
8. Breaking down the reactants bonds and forming new ones among the products.
(……………………).
9. A set of chemical formulae and symbols expressing the reactants, the products
and the reactions conditions. (……………………).
10. A bond that resulting from the participation of each of the two atoms with one
electron. (……………………).
2-Give Reason For:
1. White clouds formed on placing a glass rod wet with conc. HCl acid close to a
test tube containing ammonia solution.
…………………………..…………………………..…………………………..…………………………..…………………………..…………
……..…………………………..…………………………..…………………………..…………………………..……………………………….
2. Carbon monoxide is a dangerous gas.
…………………………..…………………………..…………………………..…………………………..…………………………..…………
……..…………………………..…………………………..…………………………..…………………………..……………………………….
3. The valency of noble gases is zero.
…………………………..…………………………..…………………………..…………………………..…………………………..…………
……..…………………………..…………………………..…………………………..…………………………..……………………………….
4. A white power is formed when a magnesium ribbon is burned in air.
…………………………..…………………………..…………………………..…………………………..…………………………..…………
……..…………………………..…………………………..…………………………..…………………………..……………………………….
5. Noble gases don’t participate in chemical reactions under the ordinary
conditions.
…………………………..…………………………..…………………………..…………………………..…………………………..…………
……..…………………………..…………………………..…………………………..…………………………..……………………………….
3-Complete the following table:
Element
Electronic configuration
Valency
7N
2He
3Li
19K
13Al
12Mg
10Ne
20Ca
Note: You will be given the atomic number of atoms to get their valencies.
You have to memorize atom symbols and the symbols and valencies of atomic groups.
4-Complete the following table:
Name
Chemical
Formula
Number of Number of
forming
atom in
element
molecule
Type of
compound
CaCl2
Mg(NO3)2
H2SO4
Na2S
(NH4)3PO4
Calcium Oxide
Copper
Hydroxide
Aluminum
Carbonate
Ferrous Oxide
Ammonium
Carbonate
Potassium
Bicarbonate
Ferric
Hydroxide
Note: The valency of copper is divalent until it is given that it is monovalent.
Fe+2: Ferrous
Fe+3: Ferric
Answers
1-Write the scientific term:
1. Ionic Bond.
2. Triple Covalent Bond
3. Valency.
4. Atomic group.
5. Chemical formula
6. Nitrogen oxides.
7. Acids.
8. Chemical reaction.
9. Chemical equation.
10. Single Covalent Bond.
2-Give Reason For:
1. Because ammonium chloride is formed.
NH3 + HCl (conc.) NH4Cl
2. Carbon monoxide (CO) has dangerous impact on human being, which it causes:
headache, fainting, severe stomachaches & may lead to death.
3. Because outermost shell is completely filled with electrons.
4. Because magnesium oxide is formed.
2Mg + O2
∆
2MgO
5. Because outermost shell is completely filled with electrons.
3-Complete the following table:
Element
7N
Electronic configuration
Valency
2,5
Trivalent - (3)
2
No valency
3Li
2,1
Monovalent - (1)
19K
2,8,8,1
Monovalent - (1)
13Al
2,8,3
Trivalent - (3)
12Mg
2,8,2
Divalent - (2)
10Ne
2,8
No valency
20Ca
2,8,8,2
Divalent - (2)
2He
4-Complete the following table:
Name
Calcium
Chloride
Magnesium
Nitrate
Sulphuric
Acid
Sodium
Sulphide
Ammonium
Phosphate
Calcium
Oxide
Copper
Hydroxide
Aluminum
Carbonate
Ferrous
Oxide
Ammonium
Carbonate
Potassium
Bicarbonate
Ferric
Hydroxide
Chemical
Formula
Number of Number of
forming
atom in
element
molecule
Type of
compound
CaCl2
2
3
Salt
Mg(NO3)2
3
9
Salt
H2SO4
3
7
Acid
Na2S
2
3
Salt
(NH4)3PO4
4
20
Salt
CaO
2
2
Oxide
Cu(OH)2
3
5
Base (Alkali)
Al2(CO3)3
3
14
Salt
FeO
2
2
Oxide
(NH4)2CO3
4
14
Salt
KHCO3
4
6
Salt
Fe(OH)3
3
7
Base (Alkali)