Question

Which are mixtures and pure substances
from the following ?
i. sea water
ii. gasoline
iii. skin
iv, a rusty nail
v. a page of the textbook.
vi. diamond​

Answer 1

Answer:

i mixture

ii. pure substance

iii. pure substance

iv. mixture

v. pure substance

vi. pure substance

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Answer 2

Solution:  

• Seawater: A mixture of dissolved organic and inorganic compounds, solid particulates, biologic organisms and remains, and some gases.
• Gasoline: A homogenous mixture of petroleum compounds or hydrocarbons (lightweight – C4-C12) with alkanes like paraffin, alkenes like olefin etc.
• Skin: A complex mixture of many substances like carbohydrates, lipids and fatty acids, proteins like pigments, multiple minerals, organic compounds like esters etc.
• A rusty nail: A mixture of iron and oxygen since the iron gets oxidized in the presence of moisture
• A page of the textbook: A mixture of many elements or chemicals that are used for making the paper, ink, adhesives, for printing and binding etc
• Diamond: is a pure substance since it is made up of molecules of a single type which is carbon molecules.