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सी.आई.एस.सी.ई.आयसीएसई ICSE Class 7

Name the Terms for the Change of a Solid into Liquid. - Chemistry

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प्रश्न

Name the terms for the change of a solid into liquid.

एक शब्द/वाक्यांश उत्तर

उत्तर

Melting.

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पाठ 1: Matter and Its Composition - Exercise

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सेलिना Concise Chemistry [English] Class 7 ICSE
पाठ 1 Matter and Its Composition
Exercise | Q 12.1

संबंधित प्रश्‍न

The inter-molecular force is maximum in


Solids have definite shape and definite volume. 


Gases have definite volume but no definite shape.


Define the following term  of Atom .


Name the property which allows metals to be hammered into thin sheets.


Give reason why copper metal is used for making electric wires.


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 is yellow in colour.


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


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 which can be used to recover salt from an aqueous salt solution.


Fill in the following blanks with suitable words :

A heterogeneous mixture of liquid and solid is conveniently separated by...............


Which method is better for recovering sugar from sugar solution : evaporation or crystallisation ? Give reason
for your answer.


The boiling point of liquid argon is :


Which of the following statements are true for pure substances?

(i) Pure substances contain only one kind of particles

(ii) Pure substances may be compounds or mixtures

(iii) Pure substances have the same composition throughout

(iv) Pure substances can be exemplified by all elements other than nickel


Give some examples of the Tyndall effect observed in your surroundings?


Higher the temperature, the higher the kinetic energy of particles.


Define the term matter.


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