1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Ira Lisetskai [31]
3 years ago
11

Which of the following reactions occurs at the anode in a voltaic cell? Cu2+ (aq) + 2e– → Cu (s)

Mathematics
2 answers:
AleksAgata [21]3 years ago
7 0
Mg (s) -->Mg2+2e-
i know cause i took the test and got it wrong and that's what  it showed as the right answer lol
emmasim [6.3K]3 years ago
7 0

Answer : The correct option is, (3) Mg(s)\rightarrow Mg^{2+}(aq)+2e^-

Explanation :

Voltaic cell : It is a device which is used for conversion of the chemical energy produces in a redox reaction into the electrical energy.

Voltaic cell is also known as the galvanic cell or electrochemical cell.

In the voltaic cell, the oxidation occurs at an anode which is a negative electrode and the reduction occurs at the cathode which is a positive electrode.

From the given reactions,

Mg(s)\rightarrow Mg^{2+}(aq)+2e^- in this reaction, oxidation reaction takes place in which the oxidation of magnesium changes from (0) to (2+). This reaction reaction occurs at anode in voltaic cell.

While in the other reactions,

Cu^{2+}(aq)+2e^-\rightarrow Cu(s) and K^{+}(aq)+1e^-\rightarrow K(s) in both the reactions, the reduction reaction takes place.

And,

Cd^{2+}+Zn\rightarrow Zn^{2+}+Cd this reaction shows both oxidation and reduction reaction.

Hence, the correct option is, (3) Mg(s)\rightarrow Mg^{2+}(aq)+2e^-

You might be interested in
How does statement reason work? Follow up question, how do I know which reason fits which statement? Another question, how do I
mina [271]
<h2>Explanation:</h2>

<em>Statement/Reason</em> is a method of presenting your logical thought process as you go from the "givens" in a problem statement to the desired conclusion. Each <em>statement</em> expresses the next step in the solution process. It is accompanied by the <em>reason</em> why it is true or applicable.

For example, if you have an equation that says ...

... x + 3 = 5

Your next "statement" might be

... x + 3 - 3 = 5 - 3

The "reason" you can make that statement is that the <em>addition property of equality</em> allows you to add the same quantity to both sides of an equation without violating the truth of the equality. You know this because you have studied the properties of equality and how they relate to the solution of equations.

In geometry (where you're more likely to encounter statement/reason questions), you know the statements you're allowed to make because you have studied the appropriate postulates and theorems. The "reason" is generally just the name of the applicable postulate or theorem. The "statement" is the result of applying it to your particular problem.

For example, if you have ∠ABC and ∠CBD, you might want to say (as part of some problem solution) ...

... m∠ABC + m∠CBD = m∠ABD

The reason you can say this is the <em>angle addition postulate</em>, which you have studied. It will tell you that the measures of non-overlapping angles with a common side and vertex can be added to give the measure of the angle that includes them both. (Many such postulates seem obvious, as this one does.)

_____

<em>Side comment on geometric proofs</em>

As you go along in geometry, you study and develop more and more theorems that you can use to find solutions to problems. Sometimes, you're required to use a restricted subset of the ones you know in order to prove others.

As an example, in some problems, you may be able to use the fact that the midline of a triangle is parallel to the base; in other problems, you may be required to prove that fact.

I sometimes found it difficult to tell which theorems I was allowed to use for any given problem. It may help to keep a list that you can refer to from time to time. Your list would tell you the name of the theorem, axiom, or postulate, and what the meaning of it is, and where it might be applied.

_____

<em>Which reason fits which statement?</em>

The "reason" is telling how you know you can make the statement you made. It is anwering the question, "what allows you to make that statement?"

<em>How do I form true statements?</em>

The sequence of statements you want to make comes from your understanding of the problem-solving process and the strategy for solution you develop when you analyze the problem.

Your selection of statements is informed by your knowedge of the properties of numbers, order of operations, equality, inequality, powers/roots, functions, and geometric relationships. You study these things in order to become familiar with the applicable rules and properties and relationships.

A "true" statement will be one that a) gets you closer to a solution, and b) is informed by and respects the appropriate properties of algebraic and geometric relations.

In short, you're expected to remember and be able to use all of what you have studied in math—from the earliest grades to the present. Sometimes, this can be aided by remembering a general rule that can be applied different ways in specific cases. (For me, in Algebra, such a rule is "Keep the equal sign sacred. Whatever you do to one side of an equation, you must also do to the other side.")

4 0
3 years ago
The longest side of an acute isosceles triangle is 12 centimeters, Rounded to the nearest tenth, what is the
vodomira [7]

Answer:

8.5

Step-by-step explanation:

5 0
3 years ago
Suppose a study of population 400,000 has been growing at rate of 7% per year if this rate continues find the population of this
inessss [21]

Answer:

680,000

Step-by-step explanation:

Population before growing rate: 400,000

Growing rate: 7%

Duration: 10 years

___

First, you will have to calculate how much does the population increase each year with the said rate, so you will have to multiply the rate by the population to determine that amount.

400,000 x 7/100 = 28,000

So the population increases by 28,000 each year, now you will have to multiply that amount by the amount of years to determine how much the amount of increase.

28,000 x 10 = 280,000

This means that the population has increased by 280,000 in these 10 years. Finally, you will have to add that number to the population amount to get the answer.

400,000 + 280,000 = 680,000

4 0
2 years ago
The increase in a person’s body temperature T(t), above 98.6ºF, can be modeled by the function T(t)=4t/t^2+1, where trepresents
elena-14-01-66 [18.8K]
The meaning of the horizontal asymptote is that the increase in a person's body temperature is a constant value when long time passes.

You can obtain that value by calculating the limit of the function when t → ∞:

                 4t
T(t) =  ------------- => Lim T(t) when t → +∞ = 0.
             t^2 + 1

That means that at long term the Temperature tends to remain at 98.6°F.
7 0
3 years ago
How do i solve these?
never [62]
1/4

 and 6/4 there we go here is your answer
6 0
3 years ago
Read 2 more answers
Other questions:
  • The equation - 5x² + 72x + 378 models the number of students enrolled in a school where x is the number of years since the schoo
    13·1 answer
  • Help me !!!!!!!!!!!!!!!!
    6·2 answers
  • Algebra 1<br><br>I need to know how to do this step by step ​
    6·1 answer
  • A manufacturer of matches randomly and independently puts 24 matches in each box of matches produced. The company knows that one
    12·1 answer
  • Need help. Please need information
    9·1 answer
  • Find the surface area
    5·1 answer
  • Solve for r.<br><br> 19 = 7 − –3r
    5·2 answers
  • Whats 13⁵+234⁶=7⁹<br> Brainlest
    8·1 answer
  • 210 students were asked whether they want to go to a water park or a roller skating rink for a class party. 50 students are girl
    11·1 answer
  • Barbara spen $3,825 for care of her pets last year. Sam spent $2,450 last year. How much more Barbara spent then Sam?
    12·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!