For an experiment, a student needs a compound that has the following properties.
• it dissolves in water.
• it is an electrolyte.
• it is excellent conductor of electricity.
which substance would be the best choice for the experiment?

Sodium chloride (Table Salt)

Explanation:

When two or more elements combine with or without the application of heat, a compound is formed. Any compound in which the elements have a complete gain and loss of electron is termed as ionic compound.

Ionic compounds have the excellent property of dissolving in water. They form ions, both positively charged and negatively charged, which conduct electricity in aqueous medium and therefore can be called as electrolytes.

Sodium chloride (Table Salt) is a common example of ionic compound. It dissolves in water. It is an electrolyte and it is an excellent conductor of electricity. So, the best choice would be Sodium chloride.

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  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-