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3 years ago

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Chemistry

1 answer:

kvasek [131]3 years ago

3 0

Answer:

0.1 M

Explanation:

Please see the attached picture for full solution.

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[cu(nh3)4]2 forms a blue solution. when concentrated hcl is added to this solution, what color will the solution change to

g100num [7]

[Cu(NH3)4]2+ forms a blue solution. When concentrated HCl is added to this solution, what color will the solution change to yellow.

Reason:
When conc. HCl is added to the solution containing [Cu(NH3)4]2+, Cl- ions will replace NH3 and form [Cu(Cl)4]2- complex. This can be understood for the following reaction:

[Cu(NH3)4]2+ + Cl- ↔ [Cu(Cl)4]2- + NH3

The Cl- ion is a weak field ligand, while NH3 is a strong field ligand. Hence, Cl- will in less splitting of d-orbitals, as compared to NH3. Due to this, photons of different energies will be absorbed by these complexes, and hence they display different colours.

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3 years ago

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The line spectrum of lithium has a red line at 670.8 nm. Calculate the energy of a photon with this wavelength.

skad [1K]

3x10^8 / (670.8 * 10^-9) =4.47x10^14 Hz 4.47x10^14 Hz multiplied by plank's constant = 2.9634x10^-19

2.96 x10-19 J

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3 years ago

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0.20dm

Alex_Xolod [135]

Answer:

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3 years ago

The energy needed to start a chemical reaction is called

vodomira [7]

Activation Energy. All chemical reactions, even exothermic reactions, need a certain amount of energy to get started. This energy is called activation energy. For example, activation energy is needed to start a car.

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In the following reaction, Zn is Zn(s) H2SO4(aq) --> ZnSO4(aq) H2(g) A.Reduced B.Oxidized C.This is not a redox reaction D.An

Svetlanka [38]

Answer: The correct option is B) oxidized

Explanation:

Redox reaction is defined as the reaction in which oxidation and reduction take place simultaneously.

The oxidation reaction is defined as the reaction in which a chemical species loses electrons in a chemical reaction. It occurs when the oxidation number of a species increases.

A reduction reaction is defined as the reaction in which a chemical species gains electrons in a chemical reaction. It occurs when the oxidation number of a species decreases.

For the given chemical reaction:

$Zn+H_2SO_4+S\rightarrow ZnSO_4+H_2$

On the reactant side:

Oxidation number of H = +1

Oxidation number of Zn = 0

Oxidation number of S = +6

Oxidation number of O = -2

On the product side:

Oxidation number of H = 0

Oxidation number of Zn = +2

Oxidation number of S = +6

Oxidation number of O = -2

As the oxidation number of Zn is increasing from 0 to +2. Thus, it is getting oxidized. Similarly, the oxidation number of H is decreasing from +1 to 0. Thus, it is getting reduced.

Hence, the correct option is B) oxidized

4 0

3 years ago

Please HELPPPPP ME ASAP!​

Please HELPPPPP ME ASAP!