Beaconhouse School System
GRADE 9 CHEMISTRY (5070) WORKBOOK
Name:
Wabbaj Muzaffar
…………………………………………………….
Section:
CB
Chemical Bonding
B2. Calcium is a metal and fluorine is a non-metal.
a. Draw the atomic structure of an atom of calcium and of fluoride ion.
[2]
b. How does the atomic structure explain why calcium is a metal while fluorine is a non-metal.
[2]
Ca
has 2 electrons in outermost shell meaning it belongs to G2 and
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is a metal, while F has 7 electrons in its outermost shell meaning it
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belongs to group 7 and is a halogen and forms electro negative ion.
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c. Why is fluorine in group VII?
[1]
F has 7 electrons in outermost shell.
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d. Why is calcium in period 4?
[1]
It has 4 shells for electrons.
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e. Define the term relative atomic mass.
[2]
Average atomic mass of isotopes of an element is known
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as relative atomic mass.
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f.
Deduce the electronic configuration of a calcium ion.
[1]
Ca*2+.
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g. Explain, in terms of subatomic particles, why an atom of calcium is electrically neutral.
It.............................................................................................................................................
has the same number of electrons and protons as
the
opposite charges of the two cancel each other out
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as the element Calcium becomes electrically neutral.
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[3]
Balancing Equations
Balance these equations.
1.
___𝐹𝑒 + ___𝐻*𝑆𝑂/ → ___𝐹𝑒*(𝑆𝑂/)+ + ___𝐻*𝑂
2.
___𝐶𝑢𝑂 + ___𝐶 → ___𝐶𝑢 + ___𝐶𝑂*
3.
___𝐶/𝐻<= + ___𝑂* → ___𝐶𝑂* + ___𝐻*𝑂
4.
___(𝑁𝐻/)*𝐶𝑟*𝑂@ → ___𝐶𝑟*𝑂+ + ___𝐻*𝑂 + ___𝑁*
5.
___𝑁𝑎*𝐶𝑂+ + ___𝐻𝐶𝑙 → ___𝑁𝑎𝐶𝑙 + ___𝐶𝑂* + ___𝐻*𝑂
6.
___𝑁*𝐻/ + ___𝑂* → ___𝐻*𝑂 + ___𝑁*
Periodic Table
Section A
1.
2.
3.
4.
5.
6.
7.
8.
Na is G1 metal while Mg is G2 metal, hence, D is correct option.
9.
1. 10.
2.
3. 12.
Section B
1 electron
Its is a good electrical conductor.
R b h a s a l o w e r b o i l i n g a n d m e l t i n g p o i n t c o m p a r e d
t o F e , a n d R b i s l e s s d e n s e a s w e l l a s s o f t e r t h a n
F e
Rb would react vigorously with water as bubbles of hydrogen gas will be given off,
heat and light energy will be released as the reaction will take place.
Yellow.
Rb + 2H2O RbOH + H2.
Lithium
Sodium
Potassium
Rubidium
Wear safety goggles and equipment for protection.
RbPO*3- 4
Cesium