Question

plz give the and of these questions correctly
this is of ICSE board class 8​

Answer 1

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

• compounds: 1- the compound is the chemical combination of elements bounded together in specific proportion
• 2-the compound is pure substance
• 3- eg Water, carbon dioxide (CO2)

• Mixture:1- the mixture is the physical combination of substances bonded together in any proportion
• 2-The mixture is an impure substance
• 3- sand and water

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