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search for the melting point of the given substance, arrange the substance in the order of increasing melting point. explain your answer. Br2, He, H2S, NH3.

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Sagot :

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Answer:

How do you arrange H20, H2S, Br2, and NaCI in increasing melting points?

Let’s review the basics: strong intermolecular (or inter-ion in the case of ionic solids) forces increase mp. Also, because it takes more energy to increase the kinetic energy of a molecule with increasing mass (KE = 1/2*m*v^2), increasing molecular weight generally increases MP within a common group (like alkanes).

So, strongest interactions are ionic. This makes NaCl the highest of the group (only ionic material). All others are molecules (non-ionic).

Let’s look at H2O and H2S. If you went by mass, H2O would have the lower MP. But molecules with O, N, and F are capable of strong intermolecular forces called hydrogen bonds. If you think “NO, I won’t Forget” you can remember that only N, O & F do this in combination with a hydrogen atom on the adjacent molecule. Water, due to hydrogen bonds has a much higher melting point than H2S.

This leaves Br2 and H2S. You may remember that Br2 is a liquid at room temperature. This suggests that it is next as H2S is a gas at room temperature. Br2 is very heavy and although it has no net dipole, the mass should make it worth consideration for the next spot.

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