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Veronika [31]
3 years ago
6

Check all examples that would a chemical property.

Chemistry
1 answer:
fenix001 [56]3 years ago
3 0

Answer:

d. reactivity to acid

f. reacts to air

Are chemical properties

Explanation:

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yes.

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Hotel: trivago

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When a baseball bat hits a baseball, what happens to the energy?<br> completo ancur
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Calculate the EMF of the following cell at standard conditions (temperature = 25o C, pressure = 1 atmosphere): Ni | Ni2+ | | Cu2
kakasveta [241]

Answer:

a) +0.574 V

b) +0.573V

Explanation:

The EMF is the electromotive force, which is the property of a device that intends to generate electrical current. The EMF of a cell can be calculated by the Nernst equation:

Emf = E° - (0.0592/n)*logQ

Where E° is the standard reduction potential of the cell, n is the number of electrons involved in the reaction, and Q is the reaction quotient ([products]/[reactants]).

In the cell, a redox reaction happens. One substance oxides (lose electrons and become a cation), and the other one reduces (gains electrons and becomes an anion). Each reaction has a reduction potential (E), which indicates how easily is to the reduction happens (as higher E as easy).

For the overall reaction, E° = Ereduction - Eoxidation. To the cell given, Ni is oxidizing, and Cu⁺² is reducing, so, the half-reactions with its E (which can be found at tables), and the overall reaction are:

Ni(s) → Ni⁺² + 2e⁻ E = -0.24 V

Cu⁺² + 2e⁻ → Cu(s) E = +0.337 V

Ni(s) + Cu⁺² → Ni⁺² + Cu(s)

E° = +0.337 - (-0.24)

E° = +0.577 V

As we can see, there're 2 electrons involved in the reaction, so n =2.

The solids don't take place in the Q value, so:

Q = [Ni⁺²]/[Cu⁺²]

a) Q = 0.1/0.08 = 1.25

Emf = 0.577 - (0.0592/2)*log(1.25)

Emf = 0.577 - 0.003

Emf = +0.574 V

b) Q = 0.4/0.3 = 1.33

Emf = 0.577 - (0.0592/2)*log(1.33)

Emf = 0.577 - 0.004

Emf = +0.573 V

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anzhelika [568]

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c

the cycling of water in and out of the atmosphere

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Darwin proposed the “theory of evolution by natural selection” in which he stated that certain members of species have adaptatio
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