NCERT Solutions for Class 9 Science Chapter 2 Download PDF
NCERT Solutions for Class 9 Science Chapter 2 Chapter 2Matter Around Us Pure provide a deep understanding of each concept. It involves detailed answers and explanations about the important concepts that students can practice and score well in the final exam. These NCERT class 9 solutions are based on the latest CBSE guidelines.
The NCERT Solutions helps students comprehend some of the most important ideas covered in the CBSE Class 9 Science curriculum. Our professionals created these NCERT Solutions for Class 9 Science to assist students in fully comprehending the topics. Please continue reading to learn about NCERT Class 9 Science Solutions PDF and download them for free.
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NCERT Solutions for Class 9 Science Chapter 2: Exercises
There are 5 exercises on the class 9 Science chapter 2. Before getting into the detailed NCERT Solution Class 9 Science, let’s overview topics and subtopics included in Chapter 2: Is Matter Around Us Pure?. The different topics covered in this chapter are tabulated below. Click on any topic name to download the solutions as a PDF.
Chapter 2 Science Class 9 Solutions: Solved Questions
The solutions for Science Chapter 2 Class 9 provided here on Embibe are solved by experts in an easy-to-understand language for all CBSE Class 9 students. Thus, students can grasp all the concepts easily.
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In this chapter, you will learn about mixtures, solution, heterogeneous mixture, colloids and their uses, pure substances, compound, etc. A pure substance consists of a single type of particle. Mixtures contain more than one kind of pure form of matter. A solution is a homogeneous mixture of two or more substances.
Q1: What type of mixtures are separated by the technique of crystallization? Ans:The technique of crystallization is used to separate solids from a liquid solution.
Q2: Differentiate between homogenous and heterogeneous mixtures with examples Ans: The differences between homogenous and heterogeneous mixtures are tabulated below:
Q3: Classify each of the following as a homogeneous or heterogeneous mixture. soda water, wood, air, soil, vinegar, filtered tea. Ans: The materials are classified as follows:
Q4. What is the definition of Saturated solution, Pure substance, Colloid and Suspension? Ans:Saturated solution: In a given solvent, no solute that can dissolve further at a given temperature is called a saturated solution. Pure substance: When a single type of particle comprises an element, it is a pure substance. E.g., silver, gold. Colloid: A solution in which the size of solute particles is more significant than a proper solution. These kinds of particles cannot be seen with our naked eyes. e.g., ink, blood. Suspension: A heterogeneous mixture in which the solute particles are large enough to settle down, e.g., chalk-water, paints, etc.
Q5: To make a saturated solution, 36g of sodium chloride is dissolved in 100 g of water at 293 K. Find its concentration at this temperature. Ans: Mass of solute (NaCl) = 36 g Mass of solvent (H2O) = 100 g Mass of solution (NaCl + H2O) = 136 g Concentration = Mass of solute/Mass of solution x 100 Concentration = 36/136 x 100 = 26.47% Hence, the concentration of the solution is 26.47%
Q6. Give some examples of pure substances or mixtures that we use in our daily lives? Ans. Some examples of the substances we use in our daily lives. Pure substances—Water, bread, sugar and gold. Mixtures—Steel, plastic, paper, talc, milk and air.
Q7: Name the techniques used to separate the following: (i) Butter from curd. (ii) Salt from seawater (iii) Camphor from salt Ans: i) To separate butter from curd, a process called centrifugation is used. The process is governed by the principle of density. ii) We can use the simple evaporation technique to separate salt from seawater. Distillation causes water to evaporate leaving solid salt behind, hence the production of salt. iii) Sublimation can be used to separate camphor from salt as, during the phase change, camphor does not undergo a liquid phase.
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