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How was viscosity measured in the "Viscosity" lab?

directly with a viscosity meter

indirectly by measuring the distance a liquid flowed in a given time

indirectly by measuring the volume of honey

directly with a spring scale

The viscosity can be measured in viscosity lab indirectly by measuring the distance a liquid flowed in a given time.

Option B

Explanation:

Viscosity is the measure of drift velocity of any fluid. So depending upon viscosity, the thickness or the density of the fluid can be understood. A fluid with high density will be highly viscous in nature and so that fluid will be flowing slowly.

In lab, we can measure the viscosity by measuring the distance a liquid flowed in a given time. If the viscosity of fluid is high, then that fluid will be taking more time to cross the given distance. And if the fluid is having less viscosity then, the liquid will be flowed easily.

  the   balanced   equation   for   reaction of   ca metal   with   o2 to   produce   cao   is as below

2 ca+ o2→ 2 cao2

  explanation

the reaction is   balanced     since the   number of atoms   in reactant side is   equal to   number of atoms   in   product side.   for   example   they   are 2   atom of   ca in   reactant   side   and   2   atoms of ca   in   the product side.

  the   process   is a   meet the   requirement   of   redox   reaction because :     calcium   is   oxidized   from   oxidation state 0   to 2+   while   oxygen   is reduced from   oxidation   state   0   to 2-