Which property is typical of a covalent compound?A. They are extremely hard solids.B. They have low melting and boiling points.C. They conduct electricity.D. They have rigid crystal structures.E. They exist only as gases and liquids.

Answers

Answer 1

Answer:

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.

Answer 2

Answer:

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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What is the pH of a solution with (H3O+)=5.6x10-2M?

Answers

Answer:

Explanation:

Given parameters:

Concentration of H₃O⁺ = 5.6 x 10⁻²M

Solution:

To solve for the concentration of H₃O⁺ in the solution, we simply use the expression below:

pH = -log₁₀[H₃O⁺]

where [H₃O⁺] = 5.6 x 10⁻²M is the concentration of H₃O⁺

pH = -log₁₀[5.6 x 10⁻²] = - x -1.25 = 1.25

Answer:

1.25 is the pH of the given solution

Explanation:

We can determine the acidity or the basicity of the solution using the pH value.

The solution is acidic if the pH value ranges from 0 to 6.9

The solution is Basic if the pH value ranges from 7.1 to 14

The solution is neutral if the pH value is 7.

pH is defined as the negative logarithm of the Hydrogen ion concentration, that’s why the formula to find pH is given by

$pH=-log[H^+]$

$pH=-log[H_3O^+]$

$pH=-log[5.6*10^(-2) M]$

$=-(1.25)$

$pH=1.25$

(Answer)

Please note:

When an hydrogen atom loses an electron, Hydrogen ion is formed, which will contain 1 positive proton and 0 negative electron and 0 neutral neutron.

Thus Hydrogen ion has a + charge.

Hydrogen ion is also called as a proton since it has only 1 proton in it.

Hydrogen ion in water that is,

$H^++H_2 O> H_3 O^+$

H_3 O^+ is called as Hydronium ion.

The _______ of a wave is a measure of the amount of energy it carries

Answers

The word that best fits is frequency. The sentence is The frequency of a wave is a measure of the amount of energy it carries. There is a direct relationship between frequency and energy of a wave. The constant of proportionality is h, Planck's constant. So, Energy = h * frequency. So, the answer is frequency. Although you should know that wavelength is related to frequency and so it is also a measure of the amount of energy and it should also be other valid answer.

The word that best fits is frequency. Thus,the sentence is,the frequency of a wave is a measure of the amount of energy it carries.

The electromagnetic radiation consists of waves made up of electromagnetic field which are capable of propogating through space and carry the radiant electromagnetic energy.

The radiation are composed of electromagnetic waves which are synchronized oscillations of electric and magnetic fields . They are created due to change which is periodic in electric as well as magnetic fields.

There is a direct relationship between frequency and energy of a wave. The constant of proportionality is h, Planck's constant. So, Energy = h frequency. So, the answer is frequency.

Learn more about electromagnetic radiation,here:

brainly.com/question/29646884

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Consider the following reversible reaction. 2H2O(g)<—>2H2(g)+O2(g) What is the equilibrium constant expression for the given system?

Answers

Answer : The equilibrium constant expression will be,

$k_(eq)=([H_2]^2[O_2])/([H_2O]^2)$

Explanation :

The given balanced chemical reaction is,

$2H_2O(g)\rightleftharpoons 2H_2(g)+O_2(g)$

The equilibrium expression for the reaction is determined by multiplying the concentrations of products and divided by the concentrations of the reactants and each concentration is raised to the power that is equal to the coefficient in the balanced reaction.

The concentrations of pure solids are constant that is they do not change. Thus, they are not included in the equilibrium expression.

So, the equilibrium constant expression will be,

$k_(eq)=([H_2]^2[O_2])/([H_2O]^2)$

Answer: D

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