In the following electrochemical cell, what is the reduction half-reaction? Mn(s) | Mn2+(aq) || Fe3+(aq), Fe2+(aq) | Pt(s)

Answers

Answer 1

Answer: In the given electrochemical cell, the reduction half-reaction occurs at the electrode on the right side of the double vertical line (||).

To determine the reduction half-reaction, we need to compare the standard reduction potentials (E°) of the species involved. The half-reaction with the more positive E° value will be the reduction half-reaction.

Looking up the standard reduction potentials in a reference table, we find that the standard reduction potential for the Mn2+/Mn couple is -1.18 V, and the standard reduction potential for the Fe3+/Fe2+ couple is +0.77 V.

Since the Fe3+/Fe2+ couple has a more positive standard reduction potential, it will undergo reduction. Therefore, the reduction half-reaction is:

Fe3+(aq) + e- → Fe2+(aq)

I hope this helps!

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To calculate the amount of heat absorbed as a substance melts, which of the following information is NOT needed?a.
the mass of the substance
c.
the change in temperature
b.
the specific heat of the substance
d.
the density of the sample

Answers

To calculate the amount of heat absorbed as a substance melts, the information which we don't need is density.

What is the formula to calculate absorbed heat?

The formula which we used to calculate the amount of involved heat in a chemical reaction is:

Q = mcΔT, where

Q = absorbed heat
m = mass
c = specific heat
ΔT = change in temperature

Hence the information which we don't need is density.

To know more about heat absorbed, visit the below link:
brainly.com/question/8828503

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The answer is d. hope it helps!

What is special about nitrogen?
and what is it main function?

Answers

Nitrogen is present in many spheres of the Earth, including the atmosphere and biosphere. Nitrogen makes up around 80% of the atmosphere (more than oxygen), and exists as a diatomic molecule. it's also essential in the function of plants, as the most commonly used mineral nutrient. It is also used in photosynthesis and is a major component of amino acids which make protein.

Which of the following is represented in the highest percentage by volume in dry air?a. Carbon dioxide
b. Oxygen
c. Hydrogen
d. Nitrogen

Answers

Answer: The correct answer is Option d.

Explanation:

Dry air is composed of a mixture of gases like argon, oxygen, nitrogen, carbon dioxide and many other gases present in trace amount.

The percentage of these gases by volume in dry air is:

Carbon dioxide = 0.03%

Argon = 0.93%

Oxygen = 20.95%

Nitrogen = 78.09%

Hydrogen = Trace amounts

From the above percentage values, we can easily say that nitrogen has the highest percentage by volume in dry air. Hence, the correct option is d.

nitrogen is the highest percent of 93%

Which tool is used to measure a single, specific volume of liquid?

Answers

The answer is a volumetric flask.

there a various tool that can be used to measure a specific volume of liquid, such as eyedroppers, cups, liter bottles, graduated cylinders, and beakers.

Which of the following statements is not true regarding acids?Most fruits contain weak acids.

Acids react with bases in neutralization reactions to produce water.

Acids can be both highly and mildly corrosive.

Active metals will react with acids in double replacement reactions.

Answers

The correct answer is the last option. Active metals will not react with acids in double replacement reactions. Instead, it reacts with metals via sing replacement reactions. It will displace hydrogen from the acid.

Active metals will react with acids in double replacement reactions.

NH4+

increase the volume
add a catalyst

Which is true about fossil fuels? A.
Coal came from ancient plants, while oil and natural gas came from marine organisms.

B.
Oil and coal came from dinosaurs, while natural came from marine organisms.

C.
Coal came from marine organisms, while oil and natural gas came from fish.

D.
Natural gas and oil came from ancient plants, while coal came from dinosaurs.

Answers

A. i just did this test

The correct answer would be D. Natural gas and oil came from ancient plants, while coal came from dinosaurs.

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How many moles of chlorine, cl, are there in 8 moles of carbon tetrachloride, ccl4?

How many electrons are in Al3+?

The internal energy of a gas decreases by 1.65 kJ when it transfers 1.87 kJ of energy in the form of heat to the surroundings.(a) Calculate the work done by the gas on the surroundings. (b) Does the volume of gas increase or decrease?

What is the most likely reason that nonmetals are electrical insulators?