JAMB Chemistry · Solutions, the environment and chemical change
Energy changes: JAMB Chemistry Past Questions and Answers
What the JAMB syllabus covers in Energy changes
Our summary: Heat given out or taken in by changes, entropy as disorder, and how ΔG decides whether a reaction is spontaneous.
- Energy changes (ΔH) accompanying physical and chemical changes (Dissolution of substances in/or reaction with water e.g. Na, NaOH, K, NH₄Cl. Endothermic (+ΔH) and exothermic (−ΔH) reactions.)
- Entropy as an order-disorder phenomenon (Simple illustrations like mixing of gases and dissolution of salts.)
- Spontaneity of reactions (ΔG° = 0 as a criterion for equilibrium, ΔG greater or less than zero as a criterion for non-spontaneity or spontaneity respectively.)
Objectives
- determine the types of heat changes (ΔH) in physical and chemical processes;
- interpret graphical representations of heat changes;
- relate the physical state of a substance to the degree of orderliness;
- determine the conditions for spontaneity of a reaction;
- relate ΔH°, ΔS° and ΔG° as the driving forces for chemical reactions; and
- solve simple problems based on the relationships ΔG° = ΔH° − TΔS°.
Syllabus content © The Joint Admissions and Matriculation Board (UTME).
JAMB Chemistry questions on Energy changes
- JAMB 2025When ΔH is positive and small, and ΔS is positive and large, the reaction will be
- JAMB 2024A typical chemical reaction will be spontaneous if
- JAMB 2024Heat of solution involves two steps that is accompanied by heat change. The energies involved in this steps are
- JAMB 2024For chemical reaction to be spontaneous, ∆G must be
- JAMB 2023Which of the following reactions would be expected to have the highest entropy change?
- JAMB 2023The heat of reaction can be determined experimentally using a device called a
- JAMB 2022When heat is absorbed during a chemical reaction, the reaction is said to be
- JAMB 2022The reactions below represent neutralization reaction, in which of them is the value of ΔH highest?
- JAMB 2021The molar enthalpy change accompanying the removal of an electron from a gas phase atom or ion in its ground state is called?
- JAMB 2021The heat required to raise the temperature of the body by 1k is called?
- JAMB 202032g of anhydrous copper(ii)tetraoxosulphate(vi) dissolved in 1dm ^3 of water generated 13.0kj of heat. The heat solution is?
- JAMB 2019The heat of formation of ethene, C 2 H 4 is 50 kJmol ^ -1 , and that of ethane, C 2 H 6 is -82kJmol ^ -1 . Calculate the heat evolved in the process: C 2 H 4 +…
- JAMB 2019Which of the following conditions will most enhance the spontaneity of a reaction?
- JAMB 2019The part of the total energy of a system that accounts for the useful work done in a system is known as
- JAMB 2018The situation obtained when a perfect gas expands into a vacuum is
- JAMB 2017When ΔH is negative, a reaction is said to be
- JAMB 2017X(g) + 3Y(g) ---- 2z(g) H = +ve. if the reaction above takes place at room temperature, the G will be
- JAMB 2015When sugar is dissolve in tea, the reaction is accomplished by?
- JAMB 2015The energy value of petrol can be determined by
- JAMB 2015NH3(g) + HCl(s) → NH 4Cl (s) The entropy change in the system above is
- JAMB 2013In an endothermic reaction, if there is a loss in entropy the reaction will
- JAMB 2012An increase in entropy can best be illustrated by
- JAMB 2011A chemical reaction which the hydration energy is greater than the lattice energy is referred to as
- JAMB 2010In which of the following is the entropy change positive?
- JAMB 2010If a reaction is exothermic and there is a great disorder, it means that?
Years with Energy changes questions in DeeepSolve's question bank
From the past questions DeeepSolve holds, not a count of everything the exam body has set.
- 2025
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- 2023
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- 2010