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सी.आई.एस.सी.ई.आयसीएसई ICSE Class 7

Define the Following Term Atom . - Chemistry

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प्रश्न

Define the following term  of Atom .

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उत्तर

Atom — An atom is the smallest part of an element that takes place in a chemical reaction.

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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 22.4

संबंधित प्रश्‍न

The inter-molecular space is maximum in


Give one difference between atoms and molecules.


Name a metal which has a low melting point.


There are three substances X, Y and Z. The substance X does not have a fixed melting point or boiling point and it still shows the individual properties of its constituents. The substance Y is a pure substance which occurs in nature as such. The substance Y has a fixed melting point and boiling point but it cannot be broken down into simpler substances by any chemical means. The substance Z is also a pure substance whose properties are entirely different from those of its constituents. The substance Z can, however, be divided by electrolysis into two substances which belong to the same class of substances as Y.

  1. What type of substance could X be ? Name one substance like X.
  2. What type of substance could Y be ? Name one substance like Y.
  3. What type of substance could Z be ? Name one substance like Z.
  4. Which process involves absorption or release of an appreciable amount of energy : formation of substance X or formation of substance Z ?
  5. Name the three groups into which all the substances like Y are divided on the basis of their properties.

What is the concentration of a solution which contains 16 g of urea in 120 g of solution ?


In what respects does a true solution differ from a colloidal solution ?


Explain what happens when a beam of light is passed through a colloidal solution.


You have been given a suspension and a solution. How could you tell the difference between them by their appearance ?


One of the following liquids will leave behind a residue on heating. This one is :


State whether the following statement are true or false :

Alcohol can be separated from a mixture of alcohol and water by a separating funnel.


What difference in the properties of oil and water enable their separation by a separating funnel ?


Fill in the following blanks with suitable words :

Miscible liquids are separated by .....................


Fill in the following blanks with suitable words :

A mixture of kerosene and petrol can be separated by .....................


With the help of a labelled diagram, describe the method of separating ammonium chloride from a mixture of ammonium chloride and common salt. Mention the difference in the properties of ammonium chloride and sodium chloride which has made this separation possible.


Which of the following mixture cannot be separated by using water as the solvent ?


The non S I and S I units of some physical  quantities are given in column A and column B respectively. Match the units belonging to the same physical quantity: 

(A) (B)
(a) degree celsius (i) kilogram
(b) centimetre (ii) pascal
(c) gram per centimetre cube (iii) metre
(d)  bar (iv) kelvin
(e) milligram (v)  kilogram per metre cube

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


Complete the following table:

S.No. CELSIUS KELVIN
1. 90°C 363 K
2. ______ 283 K
3. 63 °C ______
4. 250°C ______
5. ______ 303 K

Gases change to liquid by the process of ______.


Define the term matter.


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