Tag: chemistry

Mixtures can be obtained by a combination of elements and compounds. Thus when they are separated, it can give both elements and compounds, depending upon the constituents of a mixture.
Example: Air is the mixture of various gases. It on separation gives oxygen, nitrogen, carbon dioxide, etc. 

$BaCl _2+H _2S\longrightarrow BaS+2HCl$
                                  $1.69$ $g$
For $1$ $mole$ of $H _2S$ produce $1$ $mole$ of $BaS$
So, $1$ $mole$ $H _2S\longrightarrow 1$ $mole$ $BaS$
            $34$ $g$                      $169$ $g$
                      $(x)\longleftarrow 1.69$ $g$
$\implies x=\cfrac {1.69\times 34}{169}=0.34$ $g$
Amount of $H _2S$ needed $=0.34$ $g$

Mixture, a physical combination of two or more pure substances. A mixture is distinguished from a compound, which is formed by the chemical combination of two or more pure substances in a fixed, definite proportion. 

A true solution (or simply a solution) is a homogeneous mixture, i.e., in a true solution, the solute and solvent molecules cannot be distinguished even under a microscope because the size of the particle is very small.

A ) Brass is an alloy made of copper and zinc.
B) Dry ice, sometimes referred to as "cardice" (chiefly British chemists), is the solid form of carbon dioxide, so it is a compound.
C) Aerated drink would be anything that would have fizz (gas) filled in it. For example, your pepsi, coke, thums up, mirinda etc.
D) Diesel is mixture of many hydrocarbons.
Options C & D are correct.