Balance this reaction if necessary
Answer is C

NH3 + CO2 + H2O → NH4HCO3

This reaction is already balanced.

Explanation:

Balanced chemical reaction :

It is defined as the chemical reaction in which the number of individual atoms of an element in the reactant side always be equal to the number of individual atoms of an element in the product side.

The given balanced reaction will be,

By this equation, we can say that,

1 mole of    +  mole of  + 1 mole of  combines to give 1 mole of as a product.

ca has a crystalline lattice with positive ions (since it is a metal, metals are positively charged) and electrons flow freely in its structure since the ca atoms have a large nuclear radius so the electrons are not tightly held, therefore the electrons can flow freely since they are not being highly attracted by the nucleus. moreover, one of the properties of metals are that they are conductors of electricity, thus proving ca is the element.