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Chemistry
UTME / JAMB 2024
Reactions Rates and Chemical Equilibria
Diagram
Solution
In the graph above, y represents
A
endothermic reaction
B
activation energy
C
exothermic reaction
D
ionization energy
medium Difficulty
Study Explanation
Chemistry
UTME / JAMB 2022
Reactions Rates and Chemical Equilibria
Solution
N\(_2\)O\(_4\) ⇔ 2NO\(_2\) (Δ = -ve)
From the reaction above, which of these conditions would produce the highest equilibrium yield for N\(_2\)O\(_4\)?
A
Low temperature and high pressure
B
Low temperature and low pressure
C
high temperature and low pressure
D
high temperature and high pressure
medium Difficulty
Study Explanation
Chemistry
UTME / JAMB 2022
Reactions Rates and Chemical Equilibria
Solution
The reactions below represent neutralization reaction, in which of them is the value of ΔH highest?
A
CH\(_3\)CH\(_2\)COOH + KOH → CH\(_3\)CH\(_2\)COOK + H\(_2\)O
B
NH\(_4\)OH + HCL → NH\(_4\) + H\(_2\)O
C
NaOH + HCL → NaCL + H\(_2\)O
D
CH\(_3\)COOH + NaOH → CH\(_3\)COONa + H\(_2\)O
medium Difficulty
Study Explanation
Chemistry
UTME / JAMB 2022
Reactions Rates and Chemical Equilibria
Solution
When heat is absorbed during a chemical reaction, the reaction is said to be
A
thermodynamic
B
exothermic
C
isothermal
D
endothermic
medium Difficulty
Study Explanation
Chemistry
UTME / JAMB 2015
Reactions Rates and Chemical Equilibria
Solution
When sugar is dissolve in tea, the reaction is accomplished by?
A
positive change
B
negative entropy change
C
no entropy change
D
a minimum entropy change
medium Difficulty
Study Explanation
Chemistry
UTME / JAMB 2010
Reactions Rates and Chemical Equilibria
Diagram
The graph above demonstrate the effect of?
A
surface area on the rate of reaction
B
catalyst on the rate of reaction
C
pressure on the rate reaction
D
concentration on the rate of reaction
medium Difficulty
Study Explanation
Chemistry
UTME / JAMB 2010
Reactions Rates and Chemical Equilibria
Diagram
Solution
In the diagram above, the purpose of the asbestos to?
A
absorb impurities
B
catalyze the reaction
C
solidify the gas
D
dry the gas
medium Difficulty
Study Explanation
Chemistry
WAEC / WASSCE 2002
Reactions Rates and Chemical Equilibria
Solution
What will happen if more heat is applied to the following system at equilibrium?
X\(_2\)(g) + 3Y\(_2\)(g) ⇌ 2XY\(_3\)(g); ∆H = xKJmol\(^{-1}\)
A
the yield of XY 3 will decompose
B
more of XY3 will decompose
C
More of X2 will react
D
the forward reaction will remain static
medium Difficulty
Study Explanation
Chemistry
UTME / JAMB 2001
Reactions Rates and Chemical Equilibria
Solution
2SO\(_2\)(g) + O\(_2\)(g) ↔ 2SO\(_3\)(g)
ΔH = -189 kJ mol-1
The equilibrium constant for the reaction above is increased by?
A
decreasing the temperature of the system
B
decrease the pressure of the system
C
The addition of a catalyst to the system
D
Increasing the surface area of the vessel
medium Difficulty
Study Explanation
Chemistry
UTME / JAMB 1982
Reactions Rates and Chemical Equilibria
Solution
In the reaction N2(g) + O(g)
↔ 2NO(g) produced i an increase in the total pressure will?
A
cause less nitrogen to be produced in the equilibrium mixture
B
cause less nitric oxide to be produced in the equilibrium mixture
C
cause more nitric oxide to be produced in the equilibrium mixture
D
cause more oxygen to be produced in the equilibrium mixture
E
have no effect
medium Difficulty
Study Explanation