Which is an ionic compound and which is a molecular compound? (picture #9)

OK. One of the properties of an ionic compound is that it conducts a current in aqueous (water) solution.

The ionic compound is held together by virtue of the opposing charges; plus and minus. In water, they may just crumble away into solution! But if you Heat a solid piece of a salt, an ionic compound, it takes a great deal of Energy! So look at Compound Y.

WOW! 455°C to melt. That is high. To boil it? 1550°C. That is very high! Especially compared to compound X!

It melts at -90°C, and boils at 82°C. So it is X that is your molecular compound, one of covalent bonding, or sharing electrons, VERY different than the ionic compound held together by opposing charges.

Explanation:

the atomic number will stay the same no matter how many electrons it has, so it doesn’t decrease nor increase. it’ll only change with a different number of protons

definition

                    entropy is a measure of the randomness or the extent of disorder of a chemical process.

                      enthalpy is a measure of the heat change of a reaction occurring at a constant pressure.

measurement units:

                        entropy is measured in joule per kelvin (jk⁻¹)   whereas enthalpy is measured in joule per mole (jmol⁻¹)

requirements:

                            entropy has no requirements or limits, and its change is measured by the division between the heat change of the chemical process and the temperature.

                              in contrast, enthalpy can only be related to the heat change of the reaction under standard conditions.