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4 years ago

Which property is typical of a covalent compound?

Chemistry

2 answers:

rjkz [21]4 years ago

7 0

Answer: Option (B) is the correct answer.

Explanation:

A covalent compound is a compound whose atoms are bonded together by sharing of electrons.

Also it is known that in covalent compounds weak inter molecular forces of attraction exists. Due to which it is easy to break the bond between atoms.

Hence, covalent compounds have low melting and boiling point .

Other properties of covalent compounds are as follows.

They are brittle in nature.

The do not have a rigid crystal structure.

They exist as solids, liquids and gases.

Covalent compounds do not conduct electricity.

Thus, we can conclude that out of the given options property that is typical of a covalent compound is that they have low melting and boiling points.

Anestetic [448]4 years ago

5 0

Answer: the correct option is (C).

Explanation:

Covalent compounds have lower melting and boiling points due to presence of weak inter-molecular forces by which molecules are weakly associated to each other. Hence, melting and boiling of covalent compounds occurs at low temperatures.

Usually, Covalents compounds have following properties:

They are brittle solids
They do not conduct electricity
They do not have rigid crystal structure.
They exist in all states: solids, liquids and gases.

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3 years ago

Which element among these has the most negative electron affinity (i.e., has most exothermic electron affinity). A. H B. Li C. C

OleMash [197]

Answer:

D. F

Explanation:

Electron affinity is defined as the change in energy (in kJ/mole) of a neutral atom (in the gaseous phase) when an electron is added to the atom to form a negative ion. In other words, the neutral atom's likelihood of gaining an electron.

The electron affinity values of the following elements is given;

Electron Affinity of Hydrogen is 72.8 kJ/mol.

Electron Affinity of Lithium is 59.6 kJ/mol

electron affinity of carbon is 153.9 kJ mol‑1

Electron Affinity of Fluorine is 328 kJ/mol

The electron affinity of neon is 0 kJ mol‑1.

When nonmetals gain electrons, the energy change is usually negative because they give off energy to form an anion (exothermic process); thus, the electron affinity will be negative.

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7 0

4 years ago

Calculate the mole fraction of the ionic species kcl in the solution.

sp2606 [1]

The question is incomplete, here is the complete question:

Calculate the mole fraction of the ionic species KCl in the solution A solution was prepared by dissolving 43.0 g of KCl in 225 g of water.

Answer: The mole fraction of KCl in the solution is 0.044

Explanation:

To calculate the number of moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$ .....(1)

For water:

Given mass of water = 225 g

Molar mass of water = 18 g/mol

Putting values in equation 1, we get:

$\text{Moles of water}=\frac{225g}{18g/mol}=12.5mol$

For KCl:

Given mass of KCl = 43 g

Molar mass of KCl = 74.55 g/mol

Putting values in equation 1, we get:

$\text{Moles of KCl}=\frac{43g}{74.55g/mol}=0.577mol$

Mole fraction of a substance is given by:

$\chi_A=\frac{n_A}{n_A+n_B}$

For KCl:

Moles of KCl = 0.577 moles

Total moles = [0.577 + 12.5] = 13.077 moles

Putting values in above equation, we get:

$\chi_{(KCl)}=\frac{0.577}{13.077}=0.044$

Hence, the mole fraction of KCl in the solution is 0.044

8 0

3 years ago