Introduction The Mole Concept is a fundamental topic in Class 11 Chemistry. It helps in converting mass to moles, determining formulas, and solving chemical calculations. In this post, you will find step-by-step explanations, formulas in fraction/code style, solved examples, and a PDF download link for full notes. 1. Laws of Chemical Composition 1.1 Law of Conservation of Mass Mass can neither be created nor destroyed in a chemical reaction. Example: 2 H2 + O2 → 2 H2O Total mass of reactants = Total mass of products 1.2 Law of Definite Proportion (Proust’s Law) A chemical compound always contains the same proportion of elements by mass. Example: Water (H2O) always has 2 g H per 16 g O → 1:8 mass ratio 1.3 Law of Multiple Proportions (Dalton) When 2 elements form more than one compound, the masses of one element combined with a fixed mass of the other are in small whole number ratios. Example: CO: C=12, O=16 → C:O = 12:16 CO2: C=12, O=...
A small balcony doesn’t mean you have to give up on having a beautiful garden. With a little creativity and smart use of space, even a tiny balcony can be transformed into a relaxing green corner. Whether you want to grow fresh herbs, colorful flowers, or simply create a cozy outdoor space, there are many easy ways to do it. In this article, you will discover 10 simple and creative small balcony patio garden ideas that are perfect for beginners. These ideas are easy to set up, budget-friendly, and suitable for small spaces. You will also find helpful tips to make your balcony garden look more attractive and easy to maintain.
In our modern world, we are surrounded by complex systems—some engineered by humans and others governed by nature. From the traffic lights that manage our daily commute to the vast oceans that cover our planet, understanding how these systems function reveals the fascinating science behind them. ***The Mystery of Ocean Salinity*** While the water cycle provides us with fresh rainwater, the oceans remain consistently salty. This is a result of a geological process spanning millions of years. The Source of the Salt: Rainwater is naturally slightly acidic as it absorbs carbon dioxide from the atmosphere. As it falls on land, it slowly breaks down rocks, releasing dissolved minerals and ions like Sodium and Chloride. The Transport and Concentration: •Rivers to Sea: These minerals are carried by rivers and streams into the ocean. While the concentration in a single river is tiny, the cumulative effect over millions of years is massive. •The Evaporation Cycle: The sun’s heat causes pure wate...
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