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3 years ago

Voltalc cells produce a positive overall charge. What does this indicate?

Chemistry

2 answers:

PtichkaEL [24]3 years ago

8 0

Answer:

B. The reaction is spontaneous.

Explanation:

Edmentum

Harman [31]3 years ago

7 0

Answer:

The reaction is spontaneous.

Explanation:

If voltaic cell show positive charge it means reaction is spontaneous taking by itself.

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jasenka [17]

B the answer is letter b

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3 years ago

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Do you think a written explanation or a detailed drawing is most useful in explaining rain shadows

galina1969 [7]

I would say detailed drawing, but it is up to you

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4 years ago

When 0.5141 g of biphenyl (C12H10) undergoes combustion in a bomb calorimeter, the temperature rises from 25.823 °C to 29.419 °C

natka813 [3]

Answer:

$\Delta_{r}U$ of the reaction is -6313 kJ/mol

$\Delta_{r}H$ of the reaction is -6312 kJ/mol

Explanation:

$Temperature\,\,change= \Delta U = 29.419-25.823 =3.506^{o}C$

$q_{cal}= C \times \Delta T$

$=5.861 \times 3.596 = 21.076\,kJ$

$q_{rxn}= -q_{cal}= -21.076\,kJ$

$\Delta_{r}U= -21.076 \times \frac{154}{0.5141}= -6313\, kJ/mol$

Therefore, $\Delta_{r}U$ of the reaction is -6313 kJ/mol.

The chemical reaction in bomb calorimeter is as follows.

$C_{12}H_{10}(s)+\frac{27}{2}O_{2}(g)\rightarrow 12CO_{2}(g)+5H_{2}O(g)$

$Number\,of\,moles\Delta n=(12+5)-\frac{27}{2}=3.5$

$\Delta_{r}H=\Delta E+ \Delta n. RT$

$=-6313+3.5\times 8.314\times 10^{-3} \times 3.596=-6312\,kJ/mol$

Therefore, $\Delta_{r}H$ of the reaction is -6312 kJ/mol.

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3 years ago

An electromagnetic wave has a wavelength of 4000 meters. What is this wave length and scientific notation?

zubka84 [21]

Answer:

Wavelength of electromagnetic wave = 4.0 × 10³

Explanation:

Given:

Wavelength of electromagnetic wave = 4000 meter

Find:

Write, Wavelength of electromagnetic wave into scientific notation

Computation:

Wavelength of electromagnetic wave = 4000 meter

Wavelength of electromagnetic wave = 4.0 × 1,000 meter

Wavelength of electromagnetic wave = 4.0 × 10³

So,

Option "B" is the correct answer to the following question.

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3 years ago

Which of the following statements is true?

frez [133]

Answer: D

Explanation: Convection transfers heat by movement such as air and water.

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3 years ago