<span>Cr3+ O2- ; the formula is Cr2O3 ( criss cross)</span>
CaCl2
All of the other choices are elements
All the energy goes into melting the ice. Ice and water are <em>at equilibrium</em> during melting, so the temperature does not change.
Once all the ice has melted to water, the temperature will rise.
As temperatures increase, additional heat energy is applied to the constituent parts of a solid, which causes additional molecular motion. Molecules begin to push against one another and overall volume of a substance increases. When thermal energy is added to a substance, it’s temperature increases.
Calcium. Elements in the same group (vertical column of the periodic table) have similar properties because they share the same number of valence electrons.
