Answer
a) Water is pure
b) Blood is mixture
c) The oceans are mixture
d) Iron is pure
e) Brass is mixture
f) Uranium is pure
g) Wine is mixture
h) Leather is mixture
i) Table salt is mixture
Work Step by Step
Pure substances are samples of matter with properties that can not be changed by further purification. A mixture is simply a combination of two or more substances.
b) Blood is mixture because blood is a mixture of many chemical compounds, including cells and biological compounds, in plasma.
c) Sea water is a homogeneous mixture of water and many soluble salts of sodium, calcium, magnesium, potassium etc.
e) Various proportions of the two metals can be combined to give a range of brasses with varying properties, depending on the application.
g) Wine is mostly a solution of water, alcohol and sugar (add sulfites for most red wines) with some solid impurities, such as yeast and bacteria.
h) leather is a mixture of untanned skin and tanning agents.
i) Table salt is mixture because it is composed of sodium and chlorine
