Which of the following does NOT show a chemical change of matter? A. rust forming on a metal swingcooking an egg
B. cooking an egg
C. ice cracking
D. burning a piece of firewood

C. Ice cracking

Explanation:

The composition of the ice is still the same therefore, it is an example of a physical change.

if you're asking what comes out, it's steam.

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.