Dissolving is best described as ...

a. change from a solid to a liquid.
b. molecules breaking into ions.
c. breaking covalent bonds.
d. mingling of molecules and/or ions.
e. separation of molecules into neutral atoms.

i know insulin is primary but i dont know the others im sorry

explanation:

a gas, having a molecular weight of 13 kg/kmol and a kinematic viscosity of 0.25 cm2/s, flows through a pipe 0.25 m internal diameter and 5 km long at the rate of 0.4 m3/s and is delivered at atmospheric pressure.

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.