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3 years ago

An electrical company charges 15 p per unit of energy (kWh).

Chemistry

1 answer:

Alja [10]3 years ago

4 0

Answer:

180 p

Explanation:

Energy refers to the capacity of doing work.

Amount charged by an electrical company = 15 p per unit of energy (kWh)

As 1 W = 1000 kW,

$500W=\frac{500}{1000}kW=0.5\,kW$

Also, 1 day = 24 hours.

Cost of running a 500 W freezer = 0.5 kW freezer for 1 hour = $15\times 0.5=7.5\,p$

Therefore,

cost of running a 0.5 kW freezer for a day ( 24 hours ) = $7.5\times 24=180\,p$

Amount charged by an electrical company = 15 p per unit of energy (kWh)

As 1 W = 1000 kW,

$500W=\frac{500}{1000}kW=0.5\,kW$

Also, 1 day = 24 hours.

Cost of running a 500 W freezer = 0.5 kW freezer for 1 hour = $15\times 0.5=7.5\,p$

Therefore,

cost of running a 0.5 kW freezer for a day ( 24 hours ) = $7.5\times 24=180\,p$

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Explanation:

The water evaporated when heat was added causing the water to go.

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Draw the structure with the molecular formula C6H14O that most likely produced the below IR and 1H NMR. The 13C NMR data is 78.3

spayn [35]

Answer:

The answer is 2,3-dimethylbutan-2-ol and the structure is attached below.

Explanation:

Although we are not provided with ¹H-NMR spectrum and IR spectrum but still we can elucidate the ¹³C-NMR data and finalize a plausible structure.

First of all we look at the molecular formula, we can conclude from the formula that the structure given is saturated in nature because the hydrogen deficiency index of this formula is zero. Hence, we can say that there is no double bond either between Carbon atoms or between carbon and oxygen atom. This can also be proved by the absence of peaks in downfield as unsaturated compounds and carbonyl compounds give value above 100 and 200 ppm respectively.

Secondly, we can also conclude that among the six carbon atom two pairs of them are having same electronic environment because we are having only 4 signals hence we can conclude that two pairs have same chemical shift values.

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2 years ago

GIVING THE BRAINLIEST

Allushta [10]

The correct answer is A. Charging by friction

Explanation

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3 years ago

Rank the following elements by increasing atomic radius: carbon, aluminum, oxygen, potassium. Rank the following elements by inc

Lapatulllka [165]

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3 years ago

El pH de una solución acuosa 10^-14 M de ácido acético, a 25°C, es igual a, teniendo en cuenta que Ke = 1.76x10^-5

frez [133]

Answer:

$pH=14$

Explanation:

Hola!

En este caso, consideramos que la disociación de ácido acético ocurre:

$CH_3COOH\rightarrow CH_3COO^-+H^+$

Así, mediante la solución del equilibrio ácido, podemos calcular la concentración de iones hidronio que posteriormente sirven para calcular el pH de la solución, por tal razón, debemos calcular el equilibrio dada la constante de equilibrio y por medio de la ley de acción de masas en términos del cambio $x$ como cualquier problema de equilibrio:

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Resolviendo para $x$ , tenemos $x=0.999x10^{-14}$

Así, la concentración de hidrógeno es igual a x, por lo que el pH:

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Dicho valor tiene sentido desde que la concentración de hidrógeno es casi despreciable, por lo que se puede asumir que tiende a ser básica.

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