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प्रश्न
Give a reason for the following statement:
Components in a mixture are present in varying proportions and not in a fixed proportion.
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उत्तर
A mixture is an impure substance containing more than one element or compound, mechanically mixed together in any proportion and the mixture retains the properties of its constituents i.e. elements or compounds.
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संबंधित प्रश्न
Give two examples for the following: Metals
What is the difference between a pure substance and a mixture ?
Define the term: Element
Why is it necessary to separate the constituents of a mixture.
Give two examples of the following.
Non-metals which are lustrous
State the number of atoms of C6H12O6
Name: Three different forms of carbon
Tick (√) the correct alternative from the choice given for the following statement.
Gold is used to make jewellery because
Classify substances into pure and impure substances in the form of a chart or tabulation.
Differentiate between the terms –
elements, compounds & mixtures.
The important physical properties of substances are colour, odour, nature, density & solubility in water.
Name – two coloured gases (with their colours)
Complete the statement – an element is a pure substance made up of ____________ atoms.
Draw a labelled diagram of an atom including its nucleus, orbits & their contents.
Complete the statement given below by filling in the blank with the correct word.
An element is a pure substance which cannot be broken down by physical or _________ methods.
Elements are broadly classified into metals and non-metals. State six general differences in the physical properties of metals and non-metals. State two metals and two non-metals which contradict with the general physical properties – giving reasons. State one difference in property between metalloids and noble gases.
Select the correct answer from A, B, C, D & E for the statement given below :
A diatomic molecule.
Higher Order Thinking Skills.
List out the metals, non-metals and metalloids which you use in your house, schools. Compare their properties.
Matter is its simplest form is called ______.
Name the element which is used for making computer chips.
Give an account of elements known to us.
