Chemistry Notes Ssc Jun 2026

In MCQs, you can quickly distinguish these by remembering that mixtures (like salt in water) can be separated by physical processes, while breaking down a compound (like water into hydrogen and oxygen) requires a chemical reaction.

Chemistry Notes for SSC Exam Prep | PDF | Latent Heat - Scribd

In the exam, if you do not know the exact answer, try eliminating options based on known periodic trends or chemical properties.

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: Physical changes are reversible and do not form new substances, whereas chemical changes are irreversible and result in new substances.

Proposed by , it states: "The physical and chemical properties of elements are periodic functions of their atomic numbers." Structure of Modern Periodic Table It contains 7 Horizontal Rows called Periods . It contains 18 Vertical Columns called Groups . Group 1: Alkali Metals (Lithium, Sodium, Potassium, etc.)

Loss of Oxygen / Gain of Hydrogen / Gain of Electrons. In MCQs, you can quickly distinguish these by

Energy required to remove an electron. Increases across a period, decreases down a group.

Natural Acids: Citric acid (lemons), Acetic acid (vinegar), Formic acid (ant stings). Bitter taste, turn red litmus blue, pH > 7.

Produces a high temperature that forces atmospheric Nitrogen and Oxygen to combine, ultimately contributing to natural nitrates in soil. Quick Revision Tips for SSC Aspirants : Physical changes are reversible and do not

Matter is anything that has mass and occupies space. It exists in three primary physical states: solids, liquids, and gases.

The process of coating iron or steel with a thin layer of Zinc ( ) to protect it from rusting.

Latent Heat: Heat required to change the state without changing temperature. 2. Atomic Structure Understanding the building blocks of matter is crucial. Proton (discovered by Ernest Rutherford/Goldstein). Electron (J.J. Thomson). Neutron (James Chadwick). Atomic Terms: Atomic Number (Z): Number of protons. Mass Number (A): Protons + Neutrons.

Noble Gases (Inert gases like Helium, Neon, Argon). Trends: Atomic size decreases across a period (left to right). Electronegativity increases across a period. 4. Chemical Bonding and Reactions Ionic Bond: Transfer of electrons (e.g., NaCl). Covalent Bond: Sharing of electrons (e.g., H2Ocap H sub 2 cap O Oxidation vs. Reduction: Oxidation is the loss of electrons/gain of oxygen. Reduction is the gain of electrons/loss of oxygen. Redox Reaction: When both happen simultaneously. 5. Acids, Bases, and Salts This is a high-yield topic for SSC exams. Acids: Sour taste, turn blue litmus red, pH < 7.