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सी.आई.एस.सी.ई.आयसीएसई ICSE Class 7

What is an Amalgam? How Does an Amalgam Different from an Alloy? - Chemistry

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प्रश्न

What is an amalgam? How does an amalgam different from an alloy?  

टीपा लिहा

उत्तर

An amalgam is a homogeneous mixture of a metal in mercury whereas an alloy is a homogeneous mixture of two or more molten metals (or a non-metal) generally made for improving one or more properties of metals.
Example: When sodium dissolves in mercury, it forms sodium amalgam.
When zinc and copper are combined, alloy named brass is formed.

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पाठ 6: Metals and Non-metals - Additional questions 2

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सेलिना Concise Chemistry [English] Class 7 ICSE
पाठ 6 Metals and Non-metals
Additional questions 2 | Q 10

संबंधित प्रश्‍न

Can you store lemon pickle in an aluminium utensil? Explain.


 Name one non-metal which is stored under water.


Name a non-metal having a very high melting point.


 Choose the acidic oxides, basic oxides and neutral oxides from the following:
Na2O; CO2; CO; SO2; MgO; N2O; H2O.


Metals are said to be shiny. Why do metals generally appear to be dull? How can their brightness be restored?


Name a metal that is the best conductor of electricity 


Name a non-metal that is hardest naturally occurring substance  


Name a non-metal that is used to kill germs in water 


Write ‘True’ or ‘False’ in front of following statements. 

Non-metals are poor conductors of electricity.     


State any five physical properties of a non-metal.


`Mg -—  → Mg^(2+)`


Make pairs of substances and their properties

Substance Property
a. Potassium bromide (KBr) 1. Combustible
b. Gold 2. Soluble in water
c. Sulphur 3. No chemical reaction
d. Neon 4. High ductility.

Explain the term Minerals.


Explain the term  Gangue .


From the list of characteristics given below, select the five which are relevant to non-metals and their compounds:

  1. Ductile
  2. Conduct electricity
  3. Brittle
  4. Acidic Oxides
  5. Basic Oxides
  6. Discharged at anode
  7. Discharged at cathode
  8. Ionic chlorides
  9. Covalent chlorides
  10. Reaction with dilute sulphuric acid yields hydrogen
  11. 1, 2 or 3 valence electrons
  12. 5, 6, 7 valence electrons

(Write the five letters corresponding to the correct characteristics).


Ankita bought some Glucose Powder. She felt is was adulterated with starch powder. How would she test it?


With reference to the physical properties of metals and non-metals, state the following exception.

A non-metal which has low tensile strength


The metal is stored in kerosene ______.


Compounds obtained from non–living sources are called ______.


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