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सी.आई.एस.सी.ई.आयसीएसई ICSE Class 7

What Are Molecules ? - Chemistry

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प्रश्न

What are molecules ?

एका वाक्यात उत्तर
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उत्तर

Molecules are made of atoms. Molecules exhibit the properties of that kind of matter and has independent exi stance.

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पाठ 1: Matter and Its Composition - Additional questions

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सेलिना Concise Chemistry [English] Class 7 ICSE
पाठ 1 Matter and Its Composition
Additional questions | Q 7

संबंधित प्रश्‍न

Define the term matter. What is it composed of?


What is the scientific name of particles which make up mater?


State any two properties for believing that aluminium is a metal.


You are given two liquids, one a solution and the other a compound. How will you distinguish the solution from the compound ?


Name a metal which forms amalgams.


What is meant by (i) elements (ii) compounds, and (iii) mixtures ?Write down the names of two elements, two compounds and two mixtures.


Which of the two will scatter light : soap solution or sugar solution ? Why ?


Choose the correct answer.

A 15% alcohol solution means :


Name the different types of solutions. Give one example of each.


Classify the following into solutions, suspensions and colloids :

Soda-water, Milk, Brine, Blood, Ink, Smoke in air, Chalk water mixture, Milk of Magnesia, Shaving cream, Muddy river water.


21.5 g of sodium chloride dissolves in 60 g of water at 25°C. Calculate the solubility of sodium chloride in water at that temperature.


100 mL of water at room temperature of 25°C is taken in a beaker and a little of solid S is dissolved in it by stirring to obtain a solution X. More and more of solid S is added to the solution with constant stirring, while keeping the temperature of solution constant at 30°C. After some time it is observed that no more solid dissolves in water and at the same time some solid is also left undissolved at the bottom of the beaker.

  1. The contents of beaker are filtered through a filter paper to obtain solution Y in the form of a filtrate.
  2. What name is given to solutions like X ?
  3. What name is given to solutions like Y ?
  4. What will you observe if the solution Y at 30°C is cooled down to 10°C by keeping the beaker in crushed ice ? Why ?
  5. What term is used to denote the amount of solid dissolved in 100 grams of water in a solution lie Y ?

Name the process you would use to separate a mixture of water and alcohol.


Name the process by which common salt is purified.


Which technique can be used to detect and identify traces of poison present in the stomach wash of a person ?


Explain how, nitrogen , oxygen and argon gases are separated from air.


Tincture of iodine is a mixture of two materials X and Y. The material Y has a property that its solid form can be converted directly into vapours on heating by a process called Z.

  1. What could X be ?
  2. What could Y be ?
  3. Name the process Z.
  4. Which process would you use to recover both the components X and Y from tincture of iodine ?
  5. Which process can be used to recover only component Y from tincture of iodine ?

What's the solution?

We need to rub salt on a corncob, but only salt crystals are available.


Matter is made up of ______.


Evaporation does form bubbles.


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