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2 years ago

What changes the boiling point of different alkanes?

Chemistry

1 answer:

mote1985 [20]2 years ago

3 0

Answer:

Therefore, the boiling points of the alkanes increase with molecular size. For isomers, the more branched the chain, the lower the boiling point tends to be. Van der Waals dispersion forces are smaller for shorter molecules and only operate over very short distances between one molecule and its neighbors.

The boiling points of the normal alkanes increase with increasing molecular weight (Table 3.3). As the molecular weight increases, London forces increase because more atoms are present to increase the surface area or the molecules.

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Putting rock salt on the roads during a snowstorm is an example of: A. Boiling point elevation B. Vapor pressure raising C. Vapo

kvv77 [185]

Answer:

The correct answer is - D. Freezing point depression.

Explanation:

When rock salt is spread over snow-covered icy roads, it generates a liquid layer over it by melting from the surface thereby lowering or depression in the freezing point below the ice.

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3 years ago

Rearrange the equation for the area of a rectangle (A=l x w) to solve for length, L

Mariana [72]

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3 years ago

How many ions are in Li + Cl

Amanda [17]

It contains 5 ions.

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2 years ago

Compared to a sodium atom in the ground state a sodium atom in the excited state must have ?

kipiarov [429]

An electron with greater energy.

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2 years ago

A balloon filled with helium occupies 20.0 l at 1.50 atm and 25.0◦c. How many moles of helium will there be in the balloon at st

satela [25.4K]

Answer:

There will be 1.23 moles of helium in the balloon at STP

Explanation:

1) Initial conditions of the helium gas:

V = 20.0 liter
p = 1.50 atm
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2) Ideal gas equation:

pV = n RT
p, V, and T are given above
R is the Universal constant = 0.0821 atm-liter / ( K - mol)
n is the unknown number of moles

3) Solve for n:

n = pV / (RT) =

n = 1.50 atm × 20.0 liter / (0.0821 atm-liter /k -mol ×298.15K)

n = 1.23 mol

4) At STP:

STP stands for standard pressure and temperature.

The amount (number of moles) of the gas will not change because the change of pressure and temperature, so the number of moles reamain the same: 1.23 mol.

8 0

2 years ago