Solutions are always formed when: a) one substance dissolves uniformly in another substance b) liquids are mixed together c) a compound is created d) solids and liquids are mixed together

a.One substance dissolves uniformly in another substance.

Explanation:

Solution: It is consist of solute and solvent.

Solute is present in solution in small quantity and solvent present in large quantity in comparison to solute.

When we dissolve solute completely in the solvent  then the solution is formed.

Solute and solvent can not be separated by filtration.

It is homogeneous mixture of two or more substance.

a.One substance dissolves uniformly in another substance.

It is true because when we dissolve one substance uniformly in another substance .Then substance dissolve completely and form solution.

b.liquid are mixed together

It is not true because if we mix oil and water then they will not form homogeneous mixture.

c.a compound is created.

It is not true because when a compound is formed then it is not necessary that solution is always formed.

d.Solids and liquids are mixed together

It is not true when we mix stone and water then the mixture is not homogeneous.Therefore, it is false.

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explanation:

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number of molecules / avogadro's number * molecule molecular = mass

explanation:

we define a gram-molecular weight as the mass of one mole of any element or compound. a mole contains avogadro's number of units (molecules) –  

6.022

x

10

23

. so, dividing the number of molecules by avogadro's number gives us the number of moles. multiplying that by the molecular weight gives us the mass. from the periodic table we find the gram-molecular weight of u to be238 and of f to be19. so,  

u

f

6

will have a gram-molecular weight of 352g.