SS 3 Scheme of Work for Chemistry Second Term

The SS 3 Chemistry Scheme of Work for Second Term is designed to equip students with in-depth knowledge of advanced concepts in chemistry. This term focuses on core topics such as nuclear chemistry, shapes and molecules, petroleum and crude oil, and quantitative and qualitative analysis. Below, we will break down each week’s lessons, providing definitions, detailed explanations, and relatable examples for better understanding.

Scheme of Work for Second Term: SS 3 Chemistry

Detailed Explanation of Topics

Week 1-2: Nuclear Chemistry

Keyword: Nuclear Chemistry
Definition: Nuclear chemistry is the study of chemical processes involving the nucleus of an atom, such as radioactive decay and nuclear reactions.

Key Concepts:

1. Differences Between Nuclear and Chemical Reactions:
   • Nuclear Reactions: Involve changes in the nucleus of an atom, often resulting in a new element. Example: Uranium-235 undergoing fission.
   • Chemical Reactions: Involve the rearrangement of electrons but do not change the nucleus. Example: Hydrogen reacting with oxygen to form water.
   • Energy changes in nuclear reactions are significantly larger than in chemical reactions.
2. Types of Nuclear Reactions:
   • Fission: Splitting of a heavy nucleus into smaller nuclei. Example: Uranium-235 fission in nuclear reactors.
   • Fusion: Combination of lighter nuclei to form a heavier nucleus. Example: Hydrogen nuclei combining to form helium in the sun.
   • Radioactive Decay: Spontaneous emission of particles or energy from an unstable nucleus. Example: Carbon-14 decaying to Nitrogen-14.
3. Radioactivity:
   • Natural Radioactivity: Emission from naturally occurring isotopes like Uranium-238.
   • Artificial Radioactivity: Induced by bombarding nuclei with particles, e.g., Cobalt-60 used in cancer treatment.

Examples:

• Decay of Thorium-232.
• Fission of Plutonium-239.
• Fusion reactions in stars.

Week 3: Shapes and Molecules

Keyword: Hybridization
Definition: Hybridization is the process of combining atomic orbitals to form new hybrid orbitals suitable for bonding.

Key Concepts:

1. Types of Hybrid Orbitals:
   • sp: Linear molecules, e.g., BeCl₂.
   • sp²: Trigonal planar molecules, e.g., BF₃.
   • sp³: Tetrahedral molecules, e.g., CH₄.
   • sp³d: Trigonal bipyramidal, e.g., PCl₅.
   • sp³d²: Octahedral, e.g., SF₆.
2. Formation of Hybrid Orbitals:
   Example: Methane (CH₄) involves sp³ hybridization, where one s orbital and three p orbitals mix to form four equivalent orbitals.

Week 4: Petroleum and Crude Oil

Keyword: Fractional Distillation
Definition: The process of separating crude oil into its components based on boiling points.

Key Concepts:

1. Origin and Composition:
   • Originates from decomposed organic matter over millions of years.
   • Composed mainly of hydrocarbons such as alkanes, cycloalkanes, and aromatic compounds.
2. Fractional Distillation:
   • Heated crude oil is separated in a distillation column.
   • Fractions include gasoline, kerosene, diesel, and bitumen.
3. Economic Importance:
   • Fuels transportation.
   • Provides raw materials for plastics and chemicals.

Examples of Refineries in Nigeria:

• Port Harcourt.
• Warri.
• Kaduna.

Week 5: Quantitative Analysis/Volumetric Analysis

Keyword: Titration
Definition: A laboratory method to determine the concentration of a solution using a standard solution.

Key Concepts:

1. Indicators: Substances like phenolphthalein and methyl orange used to detect the endpoint.
2. Applications:
   • Determining the molarity of HCl using NaOH.
   • Estimating sugar concentration in soft drinks.

Week 6: Qualitative Analysis

Keyword: Tests for Biomolecules
Definition: Identifying substances like starch, proteins, and lipids in a sample.

Tests Include:

1. Starch Test: Iodine solution turns blue-black in presence of starch.
2. Protein Test: Biuret solution turns violet for proteins.
3. Fat Test: Grease spot test identifies fats.