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4 years ago

QUICKEST GETS BRAINLIEST AND 7 POINTS

1 answer:

3 0

Hello there.

Thomson's atomic model is best described by which of the following statements?

A nucleus with electrons moving around it like planets.

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A chemist designs a galvanic cell that uses these two half-reactions:

sergey [27]

<u>Answer:</u> The reaction is spontaneous and there is not enough information to calculate the cell voltage.

Explanation:

The substance having highest positive $E^o$ reduction potential will always get reduced and will undergo reduction reaction.

Oxidation reaction occurs at anode and reduction reaction occurs at cathode.

<u>For a:</u>

The half reactions for the cell occurring at cathode follows:

$O_2(g)+4H^+(aq)+4e^-\rightarrow H_2O(l);E^o_{cathode}=+1.23V$

<u>For b:</u>

The half reactions for the cell occurring at anode follows:

$Zn(s)\rightarrow Zn^{2+}+2e^-;E^o_{anode}=-0.763V$ ( × 2)

<u>For c:</u>

The balanced equation for the overall reaction of the cell follows:

$O_2(g)+4H^+(aq)+2Zn(s)\rightarrow H_2O(l)+2Zn^{2+}(aq)$

For the reaction to be spontaneous, the Gibbs free energy of the reaction must come out to be negative.

Relationship between standard Gibbs free energy and standard electrode potential follows:

$\Delta G^o=-nFE^o_{cell}$

For a reaction to be spontaneous, the standard electrode potential must be positive.

To calculate the $E^o_{cell}$ of the reaction, we use the equation:

$E^o_{cell}=E^o_{cathode}-E^o_{anode}$

Putting values in above equation, we get:

$E^o_{cell}=1.23-(-0.763)=1.993V$

As, the standard electrode potential of the cell is coming out to be positive, the reaction is spontaneous in nature.

To calculate the EMF of the cell, we use the Nernst equation, which is:

$E_{cell}=E^o_{cell}-\frac{0.059}{n}\log \frac{[Zn^{2+}]^2}{[H^{+}]^4\times p_{O_2}}$

As, the concentrations and partial pressures are not given. So, there is not enough information to calculate the cell voltage.

Hence, the reaction is spontaneous and there is not enough information to calculate the cell voltage.

7 0

4 years ago

What is the force required to move a bowling ball with a mass of 6kg at an

NeX [460]

Answer: 15N

Explanation:

The formula to calculate force in this scenario will be:

Force = Mass × Acceleration

where,

Mass = 6kg

Acceleration = 2.5m/s

We then put the values of mass and the acceleration in the formula. This will be:

F = ma

F = 6 × 2.5

F = 15N

Therefore, the force required to move the bowling ball will be 15Newton.

5 0

3 years ago

Krypton has a higher melting point than argon because of its:

dezoksy [38]

<h3>Answer:</h3>

Krypton has a higher melting point than argon because of its stronger dispersion forces.

<h3>Explanation:</h3>

Dispersion forces also known as London Dispersion forces are found in non polar compounds. These interactions take place in two steps.

Step 1: Instantaneous Dipole:

In non polar compounds the electron density on atom is symmetrical. When these symmetrical atoms approaches second symmetrical atom, a disturbance in electron densities occur due to repulsion between electrons. Due to repulsion the electrons density change there position and for a small period of time and instantaneous dipole is produced on an atom.

Step 2: Induced Dipole:

The dipole produced in step one when approaches another symmetrical atom, the partial positive part (low electron density site) attracts the electron from symmetrical atom and induces polarity in it. In this way the non polar atoms become polar and interacts with each other.

<h3>Factors Effecting Strength of Dispersion Forces:</h3>

i) Size of Atom / Molecule:

Greater the size of an atom greater will be the dispersion forces and vice versa.

ii) Shape of Molecules:

Greater the branching on molecule, weaker will be the dispersion forces and vice versa.

<h3>Conclusion:</h3>

As the size of Krypton is greater than Argon therefore, it will have stronger dispersion forces and will melt at higher temperature than Argon.

5 0

3 years ago

what order does covalent bond, dipole-dipole, hydrogen bond, ionic bond, metalic bond, and london dispersion bond for strength?

jarptica [38.1K]

Answer:The major types of solids are ionic, molecular, covalent, and metallic. ... (network) , or metallic, where the general order of increasing strength of interactions. ... In ionic and molecular solids, there are no chemical bonds between the ... by dipole –dipole interactions, London dispersion forces, or hydrogen ...

Explanation:

Hope this will help you

7 0

3 years ago

How many neutrons does an atom of<br> Copper have in its nucleus?

klasskru [66]

Answer:34.55
explanation:number of neutrons=mass number-atomic number
the mass number for copper is 63.55 so you do 63.55-29 (29 is the atomic number) and you would get 34.55

4 0

3 years ago