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3 years ago

A) What is an ELECTRIC CELL? DEL

2 answers:

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Answer:Una célula eléctrica es un dispositivo simple capaz de suministrar una corriente eléctrica. Uno o más células eléctricas que trabajan en conjunto para entregar una corriente constituyen una batería. La reacción química de una célula eléctrica se clasifica como "de oxidación-reducción". Los electrones se transfieren, la oxidación de una especie química a través de la eliminación de electrones, mientras que la reducción de otra mediante la adición de electrones. La reacción en una celda eléctrica puede ser a veces, obviamente, química, como para la batería de cobre y zinc; en otros casos, tales como la célula solar, puede ser menos obvio.

Células eléctricos pueden encontrar aplicación inversa, como en el proceso de galvanoplastia, lo que se aplica un voltaje externo que transfiere electrones en la dirección inversa, lo que resulta en la deposición de metal sobre los sustratos. Entre los yacimientos más comunes son el níquel, soldadura, cromo, cobre, plata y oro. Curiosamente, las células solares pueden tener su acción invierte. En lugar de luz que incide en sus superficies para producir electricidad, la corriente puede ser introducido que los resultados en la emisión de luz, aunque a una frecuencia diferente, a saber, el infrarrojo. Este es el principio del diodo emisor de luz

Explanation:ese es broo

leonid [27]3 years ago

4 0

Answer:

an electric cell is a device that is used to generate electricity, or one that is used to make chemical reactions possible by applying electricity.

Explanation:

Hope this helps

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These four ELEMENTS were found in early earth and they make up all living things.

VladimirAG [237]

Answer: True

Air is a mixture of many things; it's not just Oxygen, but Hydrogen, Carbon, and Nitrogen as well are made up of air. Fun fact: Nitrogen is actually more abundant in air

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3 years ago

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2 years ago

One kilogram of water at 100 0C is cooled reversibly to 15 0C. Compute the change in entropy. Specific heat of water is 4190 J/K

mina [271]

Answer:

The change in entropy is -1083.112 joules per kilogram-Kelvin.

Explanation:

If the water is cooled reversibly with no phase changes, then there is no entropy generation during the entire process. By the Second Law of Thermodynamics, we represent the change of entropy ( $s_{2} - s_{1}$ ), in joules per gram-Kelvin, by the following model:

$s_{2} - s_{1} = \int\limits^{T_{2}}_{T_{1}} {\frac{dQ}{T} }$

$s_{2} - s_{1} = m\cdot c_{w} \cdot \int\limits^{T_{2}}_{T_{1}} {\frac{dT}{T} }$

$s_{2} - s_{1} = m\cdot c_{w} \cdot \ln \frac{T_{2}}{T_{1}}$ (1)

Where:

$m$ - Mass, in kilograms.

$c_{w}$ - Specific heat of water, in joules per kilogram-Kelvin.

$T_{1}$ , $T_{2}$ - Initial and final temperatures of water, in Kelvin.

If we know that $m = 1\,kg$ , $c_{w} = 4190\,\frac{J}{kg\cdot K}$ , $T_{1} = 373.15\,K$ and $T_{2} = 288.15\,K$ , then the change in entropy for the entire process is:

$s_{2} - s_{1} = (1\,kg) \cdot \left(4190\,\frac{J}{kg\cdot K} \right)\cdot \ln \frac{288.15\,K}{373.15\,K}$

$s_{2} - s_{1} = -1083.112\,\frac{J}{kg\cdot K}$

The change in entropy is -1083.112 joules per kilogram-Kelvin.

7 0

3 years ago

If an equal number of moles of the weak acid HF and the strong base KOH are added to water, is the resulting solution acidic, ba

s344n2d4d5 [400]

Answer:

Being a weak acid and a strong base, where it is diluted in a neutral medium such as water, the basic medium predominates, almost alkaline pH.

Explanation:

The acidity of the solution, being weak, means that its pH is not so low, therefore it will be easier to reach the values of 7 or 7 where alkalinity or basity is indicated.

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3 years ago

12a. How does the model of the volcano provide evidence for the cycling of Earth materials through the rock cycle?

Bond [772]

Answer:

lava is coming from the crust

Explanation:

volcano's explode with lava because the crust pushes it out

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2 years ago