Page 27 - MODUL KIMIA A+XPLOSIVE SPM (LATEST)

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SPM Chemistry A xplosive Module (Chemistry A Ticket For “U”) RED ZONE [RZ]

What is the potential difference of the simple voltaic cell of magnesium and copper pair?
Apakah nilai beza keupayaan sel voltan ringkas bagi satu pasangan magnesium dan
kuprum?
A 3.9 V C 5.3 V
B 4.8 V D 5.6 V

42 Diagram 12 shows magnesium ribbon, tin foil, copper foil and zinc foil are coiled around
four different iron nails. The metal pairs are then placed in a test tube containing aqueous
sodium chloride solution.
Rajah 12 menunjukkan pita magnesium, lingkaran stanum, lingkaran ferum dan
lingkaran zink diikat pada paku besi. Pasangan logam itu kemudian diletakkan di dalam
tabung uji yang mengandungi larutan natrium klorida.

Diagram 12 / Rajah 12

Which of the test tubes will contain the highest concentration of iron (II) irons after 2
days?
Antara tabung uji berikut yang manakah mengandungi kepekatan ion ferum(II) yang
paling tinggi selepas 2 hari?
A Mg/Fe C Cu/Fe
B Sn/Fe D Zn/Fe

43 The neutralisations of hydrochloric acid and sodium hydroxide solution produce chloride
-1
salt and water. The reactions releases 57 kJ mol of heat.
Tindak balas peneutralan antara larutan asid hidroklorik dan larutan natrium hidroksida
-1
menghasilkan garam klorida dan air. Tindak balas itu membebaskan 57 kJ mol haba.

-1
HCl + NaOH  NaCl + H 2O ∆H = -57 kJ mol

Which of the following neutralisation reactions has the same value of heat of
neutralisation as above?

Antara tindak balas peneutralan berikut, yang manakah mempunyai nilai haba
peneutralan yang sama seperti di atas?

Sektor Pembelajaran, Jabatan Pendidikan Negeri Sabah | 2020 26