Skip to main content

New answers tagged

0 votes

How can reduction and oxidation occur separately in batteries if they're meant to be one reaction?

A balanced chemical or physical process requires conservation of Mass-Energy and Momentum. The balanced chemical equation must demonstrate that. The chemical equation is a STATE FUNCTION; it does not ...
jimchmst's user avatar
  • 2,179
1 vote

How can reduction and oxidation occur separately in batteries if they're meant to be one reaction?

This will probably be too short of an answer, but the ones you have got are good though. However, this is fundamentally true: IF something is oxidized... something else must be reduced! When a redox ...
Stian's user avatar
  • 2,815
2 votes

How can reduction and oxidation occur separately in batteries if they're meant to be one reaction?

[OP] According to this page along with many others, oxidation and reduction must occur simultaneously. However, in a battery, it seems like they actually occur separately Simultaneously means at the ...
Karsten's user avatar
  • 40.7k
1 vote

How can reduction and oxidation occur separately in batteries if they're meant to be one reaction?

Taking electrons away is oxidation. Providing electrons is reduction. As both happen at different places, oxidation and reduction occur separately. The general requirement of simultaneous (and often ...
Poutnik's user avatar
  • 42.3k
1 vote

How do I create a highly conductive vapor cloud

This is a bad idea. Mercury as a liquid or plasma is conductive, but not as a vapor. Light a candle and blow it out. The smoke will be conductive.
Paul Kolk's user avatar
  • 188
2 votes

What occurs at the atomic level when two batteries are connected in series, resulting in their voltages being added together?

Your understanding is already pretty good. It is sufficient to add two important points: The voltages are added only in the ideal case of open circuit (in the example given in OP, lightbulb having a ...
Paul Kolk's user avatar
  • 188
1 vote

What occurs at the atomic level when two batteries are connected in series, resulting in their voltages being added together?

... I do not understand why the voltages get added together when two batteries/voltaic cells are connected in series. TL; DR - Connecting of any two independent voltage sources in a series leads to ...
Poutnik's user avatar
  • 42.3k
1 vote

Why does resistance increase with increase in temperature?

Actually, electrical conductance decreases with increase in temperature, while ionic conductance increases with increase in temperature. For metals, the thermal conductivity is mainly a function of ...
Maths lover's user avatar
2 votes
Accepted

Why does resistance increase with increase in temperature?

Resistance does change with temperature. However, it changing due to the cross-sectional area increase is not possible, unless the mass of the conductor changes as well. Understanding how temperature ...
Ronith's user avatar
  • 1,339
3 votes

Why does resistance increase with increase in temperature?

It depends on the material: For semiconductors, such as germanium, resistance decreases with an increase in temperature. Semiconductors have a band-gap, and thermal energy promotes the number of ...
DrMoishe Pippik's user avatar
0 votes
Accepted

Determining an unknown E° from two similar half ox/redox reactions

First the equation of the reduction of $\ce{Cr2O7^{2-}}$ into $\ce{Cr^{3+}}$ does not produce basic ions $\ce{OH-}$ as given in Robertson's text. The reason is that, if such basic ions were produced, ...
Maurice's user avatar
  • 28.6k
2 votes

Effect of temperature on voltage of a galvanic cell can't use Nernst equation?

TL;DR; version: Testing the EMF dependence on temperature does make sense, because it is not the matter just of the term $\dfrac{RT}{nF} \ln {Q}$. But you cannot use the Nernst equation directly as ...
Poutnik's user avatar
  • 42.3k
10 votes
Accepted

Electrolysis experiment with CuSO4

During electrolysis, the graphite electrode can undergo a process called exfoliation. This happens when the strong electrical field and the chemical environment at the electrode surface cause the ...
Ronith's user avatar
  • 1,339
8 votes

Electrolysis experiment with CuSO4

It is the graphite electrode turning into less compact form of graphite. Not really a chemical reaction. Copper oxide cannot form at the cathode. Copper can appear black, depending on conditions. See:...
Paul Kolk's user avatar
  • 188
8 votes
Accepted

Is the positive electrode of voltaic cell actually positive or just less negative?

Is the positive electrode of voltaic cell actually positive or just less negative? Because it seems to me that the positive electrode is just less negative relative to the negative electrode and that ...
AChem's user avatar
  • 41.1k
4 votes
Accepted

Why Is HOI a weaker acid than HOCl?

$\ce{HOCl}$ is a stronger acid then $\ce{HOI}$ for similar reasons as why $\ce{HOI}$ is a stronger acid than $\ce{HOH}$. Because the electronegativity decreases $\ce{Cl > I > H}$. For the ...
Poutnik's user avatar
  • 42.3k

Top 50 recent answers are included