Page 46 - Nilam_Publication_module_Chemistry_Form.pdf

MODULE • Chemistry Form 4

EXERCISE / LATIHAN

Write a balanced chemical equation for each of the following reactions:
Tulis persamaan kimia seimbang bagi setiap tindak balas yang berikut:

1 Zinc carbonate Zinc oxide + Carbon dioxide / Zink karbonat Zink oksida + Karbon dioksida
ZnCO ZnO + CO
3 2
2 Sulphuric acid + Sodium hydroxide Sodium sulphate + Water / Asid sulfurik + Natrium hidroksida Natrium sulfat + Air
H SO + 2NaOH Na SO + 2H O
2 4 2 4 2
3 Silver nitrate + Sodium chloride Silver chloride + Sodium nitrate
Argentum nitrat + Natrium klorida Argentum klorida + Natrium nitrat
AgNO + NaCl AgCl + NaNO
3 3
4 Copper(II) oxide + Hydrochloric acid Copper(II) chloride + Water
Kuprum(II) oksida + Asid hidroklorik Kuprum(II) klorida + Air
CuO + 2HCl CuCl + H O
2 2
5 Magnesium + Oxygen Magnesium oxide / Magnesium + Oksigen Magnesium oksida
2Mg + O 2MgO
2
6 Sodium + Water Sodium hydroxide + Hydrogen / Natrium + Air Natrium hidroksida + Hidrogen
2Na + 2H O 2NaOH + H
2 2
7 Potassium oxide + Water Potassium hydroxide / Kalium oksida + Air Kalium hidroksida
K O + H O 2KOH
2 2
8 Zinc oxide + Nitric acid Zinc nitrate + Water / Zink oksida + Asid nitrik Zink nitrat + Air
ZnO + 2HNO Zn(NO ) + H O
3 3 2 2
9 Lead(II) nitrate Lead(II) oxide + Nitrogen dioxide + Oxygen
Plumbum(II) nitrat Plumbum (II) oksida + Nitrogen dioksida + Oksigen
2Pb(NO ) 2PbO + 4NO + O
3 2 2 2
10 Aluminium nitrate Aluminium oxide + Nitrogen dioxide + Oxygen
Aluminium nitrat Aluminium oksida + Nitrogen dioksida + Oksigen
4Al(NO ) 2Al O + 12NO + 3O
3 3 2 3 2 2

NUMERICAL PROBLEMS INVOLVING CHEMICAL EQUATIONS / PENGHITUNGAN BERKAITAN PERSAMAAN KIMIA

Calculation steps / Langkah perhitungan:
S1 / L1 : Write a balanced equation / Tulis persamaan kimia seimbang.
S2 / L2 : Write the information from the question above the equation / Tulis maklumat daripada soalan di atas persamaan.
S3 / L3 : Write the information from the chemical equation below the equation (information about the number of moles of
reactants/products).
Tulis maklumat daripada persamaan kimia di bawah persamaan (Maklumat perhubungan bilangan mol bahan/hasil tindak balas
terlibat).
S4 / L4 : Change the information in S2 into moles by using the method shown in the chart below.
Tukarkan maklumat L2 kepada mol menggunakan carta di bawah.
S5 / L5 : Use the relationship between number of moles of substance involved in S3 to find the answer.
Gunakan perhubungan bilangan mol bahan terlibat dalam L3 untuk mencari jawapan.
S6 / L6 : Change the information to the unit required using the chart below.
Tukar maklumat kepada unit yang dikehendaki dengan menggunakan carta di bawah.
–1
÷ (RAM/FRM/RMM) g mol –1 × 24 dm mol / 22.4 dm mol –1
3
3
Mass (g) No. of moles (n) Volume of gas (dm )
3
Jisim (g) Bilangan mol (n) Isipadu gas (dm )
3
× (RAM/FRM/RMM) g mol –1 ÷ 24 dm mol / 22.4 dm mol –1
3
–1
3
44
Nilam Publication Sdn. Bhd.
02-Chem F4 (3P).indd 44 12/9/2011 5:59:09 PM