JAMB Chemistry Past Questions

As you prepare for the JAMB UTME, one of the critical subjects you will likely encounter is Chemistry. This subject is known for its combination of theoretical concepts and practical equations. To help you excel in your exams and secure the best results, it is essential to familiarize yourself with JAMB past questions and understand the frequently tested chemistry equations.

Frequently Tested Chemistry Equations in JAMB

Chemistry equations are the backbone of many topics in the JAMB Chemistry syllabus. Below are some of the commonly tested equations you should master:

1. Chemical Equilibrium

Chemical equilibrium is a state in a reversible reaction where the rate of the forward reaction equals the rate of the reverse reaction. The equilibrium constant (K_c) is given by:

K_c = [Products] / [Reactants]

For example, in the reaction N₂(g) + 3H₂(g) ⇌ 2NH₃(g); the equilibrium constant is expressed as:

K_c = [NH₃]² / [N₂][H₂]³

2. Ideal Gas Law

The ideal gas law is a fundamental equation in the study of gases and their behaviors. It is defined as:

PV = nRT

Where P is pressure, V is volume, n is moles of gas, R is the gas constant, and T is temperature in Kelvin.

3. Calculations Involving Molarity

Molarity is the number of moles of solute per liter of solution and is denoted by M. It is calculated using:

M = n / V

Where n is the number of moles of solute and V is the volume of the solution in liters.

4. Heat of Reaction (Enthalpy)

The heat change that occurs during a chemical reaction is known as the enthalpy of reaction (ΔH). It can be calculated using the equation:

ΔH = ΣΔH_products - ΣΔH_reactants

This equation is central to understanding exothermic and endothermic reactions.

5. Redox Reactions

Redox reactions involve the transfer of electrons between species. The oxidation states of elements are crucial in balancing redox equations. For example:

Zn(s) + Cu²⁺(aq) → Zn²⁺(aq) + Cu(s)

Here, zinc is oxidized, and copper(II) is reduced.

These are just a few of the many equations you may encounter. To gain comprehensive knowledge and practice on these topics, Green Bridge CBT provides extensive lesson notes and Android mobile app that offer a variety of learning resources including past questions, videos, and guides to help you succeed.