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Wednesday, 22nd May 2024
Chemistry 2 (Essay) 9:30am – 11:30am
Chemistry 1 (Objective) 11:30am – 12:30pm

CHEMISTRY OBJ:

1-10: BCBDBACCCB

11-20: CAACDCBCAB

21-30: BBCCBDDDCD

31-40: BCADDAACAC

41-50: BCBCDBCADA

NOTE: YOU’RE TO ANSWER FOUR(4) QUESTIONS IN ALL.

NUMBER ONE(1) IN SECTION A AND ANY OTHER THREE(3) FROM SECTION B.

ALSO, NUMBER TWO(2) HAS TWO VERSIONS FOR VARIETIES SAKE... CHOOSE ANY

(1)

(2a)

(I)Deliquescence is the process by which a substance absorbs moisture from the atmosphere until it dissolves in the absorbed water and forms a solution. This typically occurs with hygroscopic substances that have a high affinity for water.

(II)Efflorescence is the process by which a substance loses water to the atmosphere, resulting in the formation of a powdery surface deposit. This occurs when the vapor pressure of the water in the hydrated salt is greater than the partial pressure of water vapor in the air.

(2aii)

(I)Deliquescence: Calcium chloride (CaCl₂)

(II)Efflorescence: Sodium carbonate decahydrate (Na₂CO₂·10H₂O)

(2bi)

Ionization energy is the amount of energy required to remove an electron from an isolated gaseous atom or ion in its ground state. The first ionization energy refers to the energy needed to remove the first electron, while subsequent ionization energies refer to the removal of additional electrons.

(2bii)

The second ionization energy of sodium is greater than the first because, after the first electron is removed, the remaining electrons are closer to the nucleus and experience a stronger attractive force. Removing a second electron requires more energy as it disrupts the stable, noble gas configuration left behind.

(2ci)

Charles’ Law states that the volume of a given mass of gas is directly proportional to its absolute temperature, provided the pressure remains constant. Mathematically, it is expressed as:

V/T = k

(2cii)

OR

(2)

(4)

(5)

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