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miv72 [106K]
2 years ago
12

Why do molecular compounds have low melting points and low boiling points relative to ionic substances?​

Chemistry
1 answer:
kap26 [50]2 years ago
4 0

Answer:

The melting and boiling points of molecular compounds are generally quite low compared to those of ionic compounds. This is because the energy required to disrupt the intermolecular forces between molecules is far less than the energy required to break the ionic bonds in a crystalline ionic compound

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Place the following substances in order of increasing vapor pressure at a given temperature.
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Answer:

NH3 < NF3 < BCl3

Explanation:

The vapour pressure of a substance has something to do with the nature of intermolecular forces between its molecules. If the molecules of a substance are held together by strong intermolecular forces, the substance will display a low vapour pressure at a given temperature and vice versa.

Ammonia has the lowest vapour pressure because of strong intermolecular hydrogen bonds that hold its molecules together.

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What kind of metal is Cu?
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What is transition element
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3 years ago
A gas originally occupying 10.1 L at 0.925 atm and 25 C is changed to 12.2 L at 625 torr. What is the new temperature?
IrinaVladis [17]
We can use the combined gas law equation to find the new temperature 
\frac{P1V1}{T1} =  \frac{P2V2}{T2}
parameters for the first instance are on the left side and parameters for the second instance are on the right side of the equation 
P - pressure 
P1 - 0.925 atm x 101 325 Pa/atm = 93 726 Pa
P2 - 625 torr x 133 Pa/torr = 83 125 Pa
V - volume 
V1 - 10.1 L
V2 - 12.2 L
T - temperature in kelvin
T1 -  25 °C + 273 = 298 K
substituting these values in the equation
\frac{93726Pa * 10.1L }{298K} =  \frac{83125 Pa*12.2L}{T2}
T = 319 K
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What causes electric shielding?
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Answer:

The shielding effect arises from superposition of the field from the outside charge distribution and the opposing charge distribution that was induced on the copper strips. This induced charge distribution, or "back-field," can be "frozen in place" by removing the wire interconnecting the strips.

Explanation:

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2 years ago
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