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प्रश्न
Define the term: Element
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उत्तर
Element is a substance which cannot be split up into two or more simple substances by usual chemical methods of applying heat, light or electric energy; for example, hydrogen, oxygen and chlorine.
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संबंधित प्रश्न
Write true or false
All pure substances have characteristic melting and boiling points.
Write true or false
A heterogeneous mixture has a uniform composition throughout the mixture
Name: a Metal Which is brittle
Give two examples of the following.
Elements which are liquids
Define: Atom
Give one use of the following substance:
Iron
Answer the following question:
Give the advantages of using symbols instead of names of elements or compounds.
Fill in the blank
A metal which is a poor conductor of electricity is _______.
Tick (√) the correct alternative from the choice given for the following statement.
Atoms of different kinds combine to form molecules of
Give the name of the radical - NO3
Select the correct answer from the choice given below.
The unreactive non-metallic element
Write the names of elements from the following symbol:
Br
Write the names of elements from the following symbol:
Cu
Define the term ‘compound’. In the compound carbon dioxide – the elements carbon & oxygen are combined in a fixed ratio. Explain.
Select the correct answer from A, B, C, D & E for the statement given below :
A non-metal that is lustrous.
Select the correct answer from the choice given below to complete the sentence :
Dust in air is an example of _________ mixture.
Give a reason for the following statement :
The filter paper made into a cone & placed in a funnel for filtering out the solid particles in a solid-liquid mixture should be moistened before placing it.
State true of false. If false, give the correct statement.
Two different elements may have similar atoms.
Classify the following as elements and compounds.
Water, Common salt, Sugar, Carbon dioxide, Iodine and Lithium
What are elements? What are they made of?
