Answer:
air is not a mixture because of scientists freezing it and finding different liquids, it is a mixture because the compounds that make up air e.g. oxygen (o2), Carbon dioxide (co2) and the most important Nitrogen which is an element and makes up 78.09% of air are not chemically bound in the way that compounds are
Explanation:
Multiply this number by avogadro's number- 6.02 times 10^23
Answer:
represents the additional driving force required to overcome barriers such as the large activation energy for the formation of a gas at a metal surface.
Answer :
(A) 
: It is soluble in water.
(B) 
: It is insoluble in water.
Explanation :
Solubility : It is defined as the amount of solute dissolved in a solvent at a given temperature.
According to the solubility rules:
All chlorides are soluble except 
All sulfates are soluble except 
From this we conclude that,
(A) : It is soluble in water.
(B) : It is insoluble in water.
