plz give the and of these questions correctly
this is of ICSE board class 8
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plz give the and of these questions correctly
this is of ICSE board class 8
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Explanation:
the answer to the first question will be
element:1 -an element is a pure chemical substance made of same type of atom
2- elements contain one type of atom each atom has the same atomic number i.e the same number of proton in their nucleus
3- eg: Hydrogen (H), Oxygen (O)
Compound:1- A compound contains different elements chemically combined together in a fixed ratio
2: compounds contain different elements in a fixed ratio arranged in a defined manner through chemical bonds .They contain one type of molecule
3: eg Water(H2O), Sodium bicarbonate (NaCO3)
the 2nd question answer will be
Fractional distillation is the separation of a mixture into its component parts or fractions chemical compounds are separated by heating them to a temperature at which one or more fractions of the mixture will vapour.
To separate dyes of an ink we can use chromatography which is a method of separting out materials from a mixture. Ink is a mixture of several dyes and therefore we can separate those colors from one another using chromatography. When ink is exposed to certain solvents the colours dissolve and can be separated