Ondo State 2017 Joint Exam Chemistry Expo Answer

Ondo state Joint Promotional Chemistry OBJ, THEORY/ESSAY Questions and Answer – 2017 Expo Runz

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CHEMISTRY OBJ:

1-10: ABBADBCBAD

11-20: ADCBCDCCCD

21-30: DCBDDDDABB

31-40: BCAADBCBAB

CHEMISTRY THEORY:

INSTRUCTION: Answer four (4) Question in All. Each Question Carry Equal Marks (15 Marks)

(4ai)

Boyle’s Law state that the volume of a given mass of a gas is inversely proportional to its pressure, provided that the temperature remain constant.

i.e V ∝ 1/P

V = K/P

PV = K

(ii)

(4bi)Given

Y, =500cm^3

P1=6.5X10^4Nm^2

T2=273

V2=7

P1V1 = P2V2

——– ———

T1 = T2

V2= P1V1T2

——————

P2 T1

V2= P1V1T2

———————

P2 T1

V2=6.5X10^4X500X273

————————-

1.0X10^5X303

V2= 8822500000

———————

30300000

=292.8CM^3

1.0X10^1CM^2

T1=2,73+60

=303√√

(bii)An inflated balloon expands in warm water because the Air particle in the balloon acquire more kinetic energy. there is an increase in the pressure inside the balloon and in order to keep the pressure constant, the balloon expand.

(4ci)Hard Water is a water which will not readily form lather with soap.

(cii)

– Calcium Tetraoxosulphate (vi) CaSO4

– Magnesium Hydrogen (MgH2)

– Trioxocarbonate (iv) CO3

(ciii)

– Addition of washing soda crystal (Na2CO3)

– Addition of Calculated amount of calcium hydroxide [Ca(OH)2

(5a)

(i) Normal Salt are salt formed wen all the replaceable hydrogen ion in the acid have been completely replaced by metallic ions.

(ii) Acid Salt are salt formed when the replaceable hydrogen ions in acid are only partially replaced by a metal.

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