This chapter discusses the concepts of pure substances and mixtures, explaining their differences and significance in daily life.
IS MATTER AROUND US PURE? – Formula & Equation Sheet
Essential formulas and equations from Science, tailored for Class 9 in Science.
This one-pager compiles key formulas and equations from the IS MATTER AROUND US PURE? chapter of Science. Ideal for exam prep, quick reference, and solving time-bound numerical problems accurately.
Key concepts & formulas
Essential formulas, key terms, and important concepts for quick reference and revision.
Formulas
Mass by mass percentage = (Mass of solute / Mass of solution) × 100
Mass of solute represents the quantity of solute present, while mass of solution is the total mass of solute plus solvent. This formula helps in understanding the concentration of the solution.
Mass by volume percentage = (Mass of solute / Volume of solution) × 100
Here, mass of solute is the weight of the dissolved substance and volume of solution is the total liquid volume. This formula is useful for expressing concentration in liquids.
Volume by volume percentage = (Volume of solute / Volume of solution) × 100
The formula describes the concentration based on the volume of the solute in relation to the overall volume of the solution, allowing for clear comparative analysis.
Concentration (mass/volume) = Mass of solute / Volume of solvent
Defines how concentrated a solution is, illustrating the relationship between mass of solute and the volume of the solvent used.
Solubility = Mass of solute (g) / Mass of solvent (g)
This formula aids in determining how much solute can dissolve in a specific mass of solvent, aiding in practical applications.
Equations
Ethanol + Water → Ethanol Solution
This represents the formation of a solution by mixing ethanol and water, a key example of a homogeneous mixture.
Sodium Chloride (NaCl) + Water (H₂O) → Sodium Chloride Solution
Demonstrates how sodium chloride dissolves in water to form a homogeneous solution.
Copper(II) Sulfate (CuSO₄) + Water → Copper(II) Sulfate Solution
Illustrates the dissolution of copper(II) sulfate in water to form a homogeneous mixture.
Boiling Point Elevation: ΔT_b = K_b * m
Here, ΔT_b is the elevation of the boiling point, K_b is the ebullioscopic constant, and m is the molality of the solution. Useful in understanding colligative properties.
Rust = Iron (Fe) + Oxygen (O₂) + Water (H₂O) → Iron Oxide (Fe₂O₃)
This chemical reaction shows the process of rust formation, highlighting that chemical changes occur in mixtures.
This chapter explains matter, its properties, and its different states. Understanding matter is essential as it forms the basis of all physical substances around us.
Start chapterThis chapter explores the concepts of atoms and molecules, including their definitions, properties, and significance in understanding matter.
Start chapterThis chapter discusses the structure of atoms, including the particles they are composed of and the models that describe their arrangement. Understanding atoms is crucial for grasping the nature of matter around us.
Start chapterThis chapter explores the fundamental unit of life, the cell, its structure, functions, and significance in living organisms.
Start chapterThis chapter introduces tissues, groups of similar cells in plants and animals that work together for specific functions. Understanding tissues is crucial for studying the structure and functions of living organisms.
Start chapterThis chapter explores the concept of motion, detailing how different objects move and how we perceive their motion relative to a reference point.
Start chapterThis chapter explains the concepts of force and motion, exploring how forces affect the movement of objects and the principles behind these interactions.
Start chapterThis chapter covers the concept of gravitation and its significance in the universe, particularly the universal law of gravitation and its effects on objects on Earth and in space.
Start chapterThis chapter focuses on the concepts of work, energy, and power, and their significance in understanding physical processes and activities.
Start chapterThis chapter explores how sound is produced, transmitted, and perceived. Understanding sound is essential as it plays a vital role in communication and many technologies we use daily.
Start chapter
