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3 years ago

Not including the noble gases, which area of the periodic table has the highest electronegativities?

Chemistry

2 answers:

Anna71 [15]3 years ago

8 0

The answer is the upper right Fluorine is the most electronegative.

alekssr [168]3 years ago

3 0

Answer: Option (a) is the correct answer.

Explanation:

It is known that when we move across a period from left to right in a periodic table then there will be decrease in size of elements. This is because of addition of electrons into the same sub-shell.

Whereas when we move down a group then there occurs an increase in size of atoms due to addition of new sub-shells.

As electronegativity is the ability of an atom to attract an electron towards itself. Hence, smaller is the size of an atom more will be the ability of its nucleus to attract a proton towards itself. As a result, higher will be its electronegativity.

For example, fluorine is the most electronegative element present in the periodic table.

Thus, we can conclude that upper right area of the periodic table has the highest electronegativities.

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Ephedrine, a central nervous system stimulant, is used in nasalsprays as a decongestant. this compound is a weak organic base: {

sashaice [31]

Ephedrine, a central nervous system stimulant, is used in nasal sprays as a decongestant. This compound is a weak organic base:

C10H15ON (aq) + H2O (l) -> C10H15ONH+ (aq) + OH- (aq)

A 0.035 M solution of ephedrine has a pH of 11.33.

a) What are the equilibrium concentrations of C10H15ON, C10H15ONH+, and OH-?

b) Calculate Kb for ephedrine.

c(C₁₀H₁₅NO) = 0,035 M.
pH = 11,33.
pOH = 14 - 11,33 = 2,67.
[OH⁻] = 10∧(-2,67) = 0,00213 M.
[OH⁻] = [C₁₀H₁₅NOH⁺] = 0,00213 M.
[C₁₀H₁₅NO] = 0,035 M - 0,00213 M = 0,03287 M.
Kb = [OH⁻] · [C₁₀H₁₅NOH⁺] / [C₁₀H₁₅NO].
Kb = (0,00213 M)² / 0,03287 M = 1,38·10⁻⁴.

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3 years ago

What is the importance of a special habitat?

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They meet all the environmental conditions an organism needs to survive

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2 years ago

When I2 and FeCl2 are mixed together, iodine (I) cannot replace chlorine (Cl) in the compound because iodine is lower on the per

Nata [24]

Answer: The given statement is true.

Explanation: If this reaction would have occurred, then this reaction would be considered as displacement reaction.

Displacement reactions are the reaction in which more reactive element displaces the less reactive element in a chemical reaction. This is based on the reactivity of elements.

Reactivity of elements is the tendency of the elements to gain or loose electrons. The reactivity decreases down the group in a periodic table.

In the given reaction, Iodine and chlorine are the elements of the same group in the periodic table and iodine lies below chlorine in the group. So, the reactivity of iodine is less than the reactivity of chlorine.

Hence, in the given reaction, iodine will not replace chlorine because it lies below in the periodic table.

$FeCl_2+I_2\rightarrow \text{No reaction}$

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4 years ago