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(a) The molecules in a solid vibrate about a fixed position (b) The molecules in liquid are arranged in a regular pattern 3 years ago BidishaKashayap1333 class 9 matter our surroundings lakhmir singh When a gas jar containing colourless air is kept upside down over a gas jar full of brown coloured bromine vapour, then after some time, the brown colour of bromine vapour spreads into the upper gas jar making both the gas jar appears brown in colour... 3 years ago BidishaKashayap1333 class 9 matter our surroundings lakhmir singh When a gas jar full of air is placed upside down on a gas jar full of bromine vapours, the red-brown vapour of bromine from the lower jar go upward into the jar containing air. 3 years ago BidishaKashayap1333 class 9 matter our surroundings lakhmir singh Which of the following statement is correct? (a) The particles of matter are very, very small (b) The particles of matter attract one another 3 years ago BidishaKashayap1333 class 9 matter our surroundings lakhmir singh A form of matter has no fixed shape but it has a fixed volume. An example of this form of matter is 3 years ago BidishaKashayap1333 class 9 matter our surroundings lakhmir singh The best evidence for the existence and movement of particles in liquids was provided by 3 years ago BidishaKashayap1333 class 9 matter our surroundings lakhmir singh Out of the following, an example of matter which can be termed as fluid is 3 years ago BidishaKashayap1333 class 9 matter our surroundings lakhmir singh In which of the following conditions, the distance between the molecules of hydrogen gas would increase? (i) Increasing pressure on hydrogen contained in a closed container 3 years ago BidishaKashayap1333 class 9 matter our surroundings lakhmir singh A few substances are arranged in the increasing order of ‘forces of attraction’ between their particles. Which one of the following represents the correct arrangement? 3 years ago BidishaKashayap1333 class 9 matter our surroundings lakhmir singh Which one of the following statements is correct in respect of fluids? (a) Only gases behave as fluids (b) Gases and solids behave as fluids 3 years ago BidishaKashayap1333 class 9 matter our surroundings lakhmir singh When a crystal of potassium permanganate is placed at the bottom of water in a beaker, the water in the whole beaker turns purple on its own, even without stirring. This is an example of 3 years ago BidishaKashayap1333 class 9 matter our surroundings lakhmir singh What is Brownian motion? Draw a diagram to show the movement of a particle (like a pollen grain) during Brownian motion. (b) In a beam of sunlight entering a room, we can sometimes see dust particles moving in a haphazard way in the air. 3 years ago BidishaKashayap1333 class 9 matter our surroundings lakhmir singh (a) Define matter. Give four examples of matter. (b) What are the characteristics of matter? 3 years ago BidishaKashayap1333 class 9 matter our surroundings lakhmir singh (a) Why does a gas exert pressure? (b) Why does a gas fill a vessel completely? (c) Why are gases so easily compressible whereas it is almost impossible to compress a solid or a liquid? 3 years ago BidishaKashayap1333 class 9 matter our surroundings lakhmir singh (a) Compare the properties of solids, liquids and gases in tabular form. (b) Give two reasons for saying that wood is a solid. 3 years ago BidishaKashayap1333 class 9 matter our surroundings lakhmir singh What is meant by ‘diffusion’? Give one example of diffusion in gases. (b) Why do gases diffuse very fast? (c) Name two gases of air which dissolve in water by diffusion. 3 years ago BidishaKashayap1333 class 9 matter our surroundings lakhmir singh Explain why, diffusion occurs more quickly in a gas than in a liquid. 3 years ago BidishaKashayap1333 class 9 matter our surroundings lakhmir singh Explain why: (a) Air is used to inflate tyres. (b) Steel is used to make railway lines. 3 years ago BidishaKashayap1333 class 9 matter our surroundings lakhmir singh Honey is more viscous then water. Can you suggest why? 3 years ago BidishaKashayap1333 class 9 matter our surroundings lakhmir singh When a crystal of copper sulphate is placed at the bottom of a beaker containing water, the water slowly turns blue. why? 3 years ago BidishaKashayap1333 class 9 matter our surroundings lakhmir singh Page 1 / 5 1 2 3 4 5 Next Share: Super Globals Requests: Server: Options and Features route: community use_home_url: url: https://eanshub.com/community/ pageid:187 default_groupid: 3 2022 How Can We Help? 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