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Alenkinab [10]
1 year ago
5

A high school girl was getting ready for a big date but discovered with horror that her silver necklace was tarnished. having ju

st studied about redox reactions and electrochemical cells in chemistry class, she grabbed some aluminum foil, put it in a dish, and placed her necklace on top of the foil. then she added some baking soda, a little salt, and hot water. within a few minutes, her necklace was bright and shiny again.
the formula for silver tarnish is ag2s. use the balanced equation to answer the following questions:
3ag2s + 2al(s) al2s3 + 6ag(s)

a. what makes this an oxidation-reduction reaction? (1 point)
b. write the half-reactions showing the oxidation and reduction reactions. identify which is the oxidation reaction and which is the reduction reaction. (3 points)
c. what is oxidized in the reaction? what is reduced? (2 points)
d. in this simple electrochemical cell, what functions as the anode? what is the cathode? (3 points)
e. is this a galvanic cell or electrolytic cell? explain your answer. (2 points)
f. what would the overall potential for this cell be? (4 points)
Chemistry
1 answer:
OLga [1]1 year ago
7 0

Answer:

a. What makes this an oxidation-reduction reaction? (1 point)

Loss of electron by the aluminum and the gain of electron by the silver

b. Write the half-reactions showing the oxidation and reduction reactions. Identify which is the oxidation reaction and which is the reduction reaction. (3 points)

oxidation half reaction: Al → Al3+ + 3e-

Reduction half reaction: Ag+ + e- → Ag

c. What is oxidized in the reaction? What is reduced? (2 points)

Aluminum is oxidized and silver is reduced

d. In this simple electrochemical cell, what functions as the anode? What is the cathode? (3 points)

In a simple electrochemical cell the electrode where oxidation takes place is the anode. And the electrode where reduction reaction happens is the cathode.

e. Is this a galvanic cell or electrolytic cell? Explain your answer. (2 points)

An electrolytic cell because the reaction converts electrical energy into chemical energy

Not sure about e and f!

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Consider the molecule BF3. (a) What is the electron config- uration of an isolated B atom? (b) What is the electron con- figurat
anzhelika [568]

For the given molecule, we are asked to give-

  1. The electron configuration of an isolated B atom
  2. The electron configuration of an isolated F atom
  3. Hybrid orbitals should be constructed on the B atom to make the B–F bonds in Boron tri flouride
  4. valence orbitals, if any, remain unhybridized on the B atom.
  • The electron configuration of an isolated B atom:

as atomic number of B is 5

electronic configuration will be [He] 2s² 2p¹

  • The electron configuration of an isolated F atom:

as atomic number of F is 9

electronic configuration will be  [He] 2s² 2p5

  • Hybrid orbitals should be constructed on the B atom to make the B–F bonds in Boron tri flouride will be sp2.

as the one s and two of p orbital from the valance shell will hybridised to make 3 hybrid orbital of B resulting in 3 B-F bonds.

  • valence orbitals, if any, remain unhybridized on the B atom will be 1

To know more about hybrisisation:

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8 0
11 months ago
Please help meeee ;-;
Elena-2011 [213]

Answer:

number (12 is c)  (13 is 5) (14 is 5)

Explanation:

3 0
2 years ago
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Henry Moseley organized the periodic table by A. atomic weight. B. atomic number. C. electronegativity. D. overall charge of ato
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B - Atomic number. Dmitri Mendeleev organised the table according to atomic weight, however this caused problems with elements such as iodine and tellurium, Iodine has a higher mass, but a lower atomic number. And to make iodine in the same group as similar elements (halogens), Mendeleev had to break his own rules and put it before tellurium in the table. Moseley fixed this problem by ordering the elements according to atomic (proton) number.
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6 0
3 years ago
5. What volume of silver metal will weigh exactly 4500.0 g. The density of silver is 20.5 g/cm.
Vitek1552 [10]

Answer:

The answer is

<h2>219.5 mL</h2>

Explanation:

The volume of a substance when given the density and mass can be found by using the formula

volume =  \frac{mass}{density} \\

From the question

mass = 4500 g

density = 20.5 g/cm³

We have

volume =  \frac{4500 }{20.5}  \\  = 219.51219...

We have the final answer as

<h3>219.51 mL</h3>

Hope this helps you

8 0
3 years ago
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