What are the factors that determine the boiling points of different substances?

In summary, boiling point is the temperature at which a substance changes from a liquid to a gas. It can be determined experimentally or calculated using theoretical methods. Factors that affect boiling point include atmospheric pressure, intermolecular forces, and molecule mass. Knowing the boiling point of a substance is important for identification and industrial processes. It can also provide information about the substance's physical properties.
  • #1
babbagee
74
0
How do i find out which substance has a higher boiling point.

Which substance has the higher boiling point? Explain.

a.) LiCl or HCl
b.) NH3 or PH3
c.) Xe or I2

I also have a question on vaporization

Which forces oppose vaporization of each substance?
a.) hexane
b.) water
c.) SiCl4
 
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  • #2
is this for homework?
 
  • #3
Look at the intermolecular bonding (VdW, H-bonds, etc.)

and for part 2:

the same.

this is not for homework u have to give it a go b4
 

1. What is the definition of boiling point?

The boiling point of a substance is the temperature at which it changes from a liquid to a gas. It is the temperature at which the vapor pressure of the liquid is equal to the atmospheric pressure.

2. How is boiling point determined?

Boiling point can be determined experimentally by heating a sample of the substance and measuring the temperature at which it starts to boil. It can also be calculated using theoretical methods such as the Clausius-Clapeyron equation.

3. What factors affect boiling point?

The boiling point of a substance is affected by several factors, including atmospheric pressure, intermolecular forces between molecules, and the mass of the molecules. Generally, substances with stronger intermolecular forces and larger molecule mass will have a higher boiling point.

4. Why is it important to know the boiling point of a substance?

The boiling point of a substance is important for several reasons. It can be used to identify a substance, as different substances have different boiling points. It is also important in industrial processes, such as distillation, where different substances can be separated based on their boiling points.

5. Can boiling point be used to predict the physical properties of a substance?

Yes, the boiling point of a substance can provide information about its physical properties, such as its volatility and solubility. It can also give insight into the strength of intermolecular forces present in the substance.

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