3. Which statement descobes a chemical change? 1) Alcohti evaporates
2) Table salt (NaCl) is crushed into powder
3) Water vapor forms snowflakes
4) Glucose (C6H12O6) and oxygen produce CO2 and H2O

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.