Foundations of Chemistry S. Do you expect Explain Enp tht ding llys groups to a

Question

Foundations of Chemistry S. Do you expect Explain Enp tht ding llys groups to a molecule will ncrease or decrease the boiling point? Why is the boiling point of ammonia higher than the boiling point of methane? H+ 6. 7. What type of interaction leads to the very high melting point of sodium chloride? 8. What type of interaction leads to the high boiling point of water? PROBLEMS 1. Of the following (a through e), which increase and which decrease, as the strength of the attractive noncovalent interactions increases? Explain. Deviations from the ideal gas law b) Boiling temperature c) Sublimation d) Vapor pressure e) The energy it takes to vaporize 1 mol of the substance Chapter 10: Phases of Matter 190

Explanation / Answer

5. Yes..!!! Of course..!!! Addition of alkyl group to a molecule will increase the boiling point.Because with addition of alkyl group (Such as methyl, ethyl etc.) then the overall molecular mass( or, molecular weight) increases and as well the boiling point increases.

6. The boiling point of NH3 is higher than the boiling point of CH4. This is because NH3 is more polar than CH4 ( it is non-polar). With the increase in polarity the molecular attraction forces increases and as well Vander Waals force of attraction and all other forces (like H-bonding, dipole-dipole attraction forces) increases. That's the reason polar compound has a higher boiling point.

7. Sodium chloride is an ionic compound. Sodium ion and chloride ion is held by strong interionic attraction forces. To break the attraction force, we need to pay more energy. That's the reason Sodium chloride has a high melting point.

8. Non-covalent interaction (more specifically H-bonding) leads to high boiling point of water.

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