The term ________ is used to describe the conversion of a solid directly to a gas, without passing through the liquid state.

1 answer:

6 0

The term sublimation is used to describe the conversion of a solid directly to a gas, without passing through the liquid state. This process is an endothermic process which means that it needs a supply of energy to happen. It happens at a temperature and pressure that is below the triple point of a substance. There are some substances that prefers sublimation rather than evaporation like arsenic and carbon. This is for the reason that the pressure for the triple point of these substances are very high and it would be difficult for them to be at the liquid state. The energy needed for sublimation to happen is calculated from the sum of enthalpy of vaporization and enthalpy of fusion.

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Which of the following characteristics is not a property of an acid?

s2008m [1.1K]

Increases the concentration of hydronium ions in an aqueous solution

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3 years ago

Electronegativity Values

My name is Ann [436]

Answer:

A and B

Explanation:

The ionic bond is formed when there is large electronegativity difference is present between the bonded atoms.

Ionic bond:

It is the bond which is formed by the transfer of electron from one atom to the atom of another element.

Both bonded atoms have very large electronegativity difference. The atom with large electronegativity value accept the electron from other with smaller value of electronegativity.

For example:

Sodium chloride is ionic compound. The electronegativity of chlorine is 3.16 and for sodium is 0.93. There is large difference is present. That's why electron from sodium is transfer to the chlorine. Sodium becomes positive and chlorine becomes negative ion. Both atoms are bonded together electrostatic attraction occur between anion and cations.

Now we will calculate the electronegativity difference between given atoms.

A -B (3.44 - 0.79)

A - B (2.65)

B - C (1.8 -0.79)

B - C (1.01)

A - D (3.44 - 1.8)

A - D (1.64)

C - D (2.0 - 1.8)

C - D (0.2)

So, A and B are most likely to form ionic bond.

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4 years ago

What is the mass of 4.5 moles of nitrogen gas

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n = m / M

m = n × M

Nitrogen (N2) - a gas is always with an index 2 if we don't have shown how many molecules are there

m (N2) = 4,5 mol × (2×14.007 g/mol)

m (N2) = 4,5 mol × 28.014 g/mol = 126.063g

if you don't solve with the decimals in class just replace 14.007 with 14

also if you haven't learned abour gasses aways having index 2 then:

m (N2) = 4,5 mol × 14.007 g/mol = 63.0315g

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Nitration: Nitration of benzene yield nitrobenzene.
Reduction: Reduction of Nitrobenzene yield Aniline.
Diazotization: Diazonium alt of benzene is formed from aniline.
At last diazonium salt is reacted with CuCl to yield chlorobenzene.