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Mice21 [21]
2 years ago
10

In sediments and waterlogged soil, dissolved O2 concentrations are so low that the microorganisms living there must rely on othe

r sources of oxygen for respiration. Some bacteria can extract the oxygen in sulfate ions, reducing the sulfur in them to hydrogen sulfide gas and giving the sediments or soil a distinctive rotten-egg odor.
Required:
a. What is the oxidation number of sulfur in these compounds?
b. Write the net ionic equation for the reaction under acidic conditions (H3O+) that releases O2 from sulfate and forms hydrogen sulfide gas. Use water as the reactant In the hall-reaction that describes the formation of oxygen.
Chemistry
1 answer:
kakasveta [241]2 years ago
3 0

Answer:

1) SO₄ ²⁻ : (+6)

  H₂S : (-2)

Explanation:

a) <u>Sulfate reducers</u> are widespread in muds and other sediments, water-logged soils, etc., environments that contain SO₄ ²⁻ and become anoxic as a result of microbial decomposition.

Sulfate (SO₄ ²⁻), the most oxidized form of sulfur (+6), <u>is reduced</u> by these

sulfate-reducing bacteria. The end product of sulfate reduction is hydrogen sulfide, H₂S, (oxidation number -2) an important natural product that participates in many biogeochemical processes. The H₂S they generate is responsible for the pungent smell (like that of rotten eggs) often encountered near coastal ecosystems. When sulfate-reducing bacteria grow, the H₂S formed from SO₄ ²⁻ reduction combines with the ferrous iron to form black, insoluble ferrous sulfide, which is not toxic. This is important for the conservation of the environment.

b) The net ionic equation under acidic conditions is:

              4 H₂ + SO₄²⁻ + H⁺ → HS⁻ + 4 H₂O

    Global reaction:  SO₄²⁻ + 2H⁺ → H₂S + O₂

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Galina-37 [17]

Answer:

physical change

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7 0
3 years ago
When an acid like HCl dissociates in water, it essentially is ________.Select one:a. making the water more basicb. raising the p
jeyben [28]

1) Acidic solution. An acidic solution has a high concentration of H+ ions.

2) Basic solution. A basic solution has a high concentration of OH- ions.

3) HCl chemical reaction.

HCl+H_2O\rightarrow H_3O^++Cl^-

You can also write it as follows

HCl+H_2O\rightarrow H^++Cl^-

4) pH scale.

When the concentration of H+ is high, the solution is acidic. H+ lowers the pH of the solution.

Option D.

3 0
1 year ago
1.I make my cup of coffee in the morning by pouring boiling water over ground-up coffee beans held in a special piece of paper a
777dan777 [17]

Answer:

Filtration

Explanation:

Filtration is a physical separation technique that is used to separate solids from liquids or gases. The process involves the use of a filter which allows just the liquid to pass through.

In this case, the coffee beans is the solid and the boiling water is the liquid. The special piece of paper is the medium (filter) through which the coffee is collected.

The coffee coming through the special piece of paper (filter) is called a filtrate.

Filtration is used in the preparation of the cup of coffee.

5 0
3 years ago
Suppose that, from measurements in a microscope, you determine that a certain layer of graphene covers an area of 1.50μm2. Conve
Serhud [2]
.0000015 meters squared. just got to move the decimal


3 0
3 years ago
As the magnesium reacts, the hydrogen gas produced is collected by water displacement at 23.0oC. The pressure of the gas in the
stiv31 [10]

Answer: The pressure that the H_2(g) produced in the reaction would have if it were dry will be 728 torr

Explanation:

According to Dalton's law, the total pressure is the sum of individual pressures.

p_{total}=p_{H_2}+p_{H_2O}

Given : p_{total}  =total pressure of gas = 749 torr

p_{H_2} = partial pressure of hydrogen = ?

p_{H_2O} = partial pressure of water = 21 torr

putting in the values we get:

749=p_{H_2}+21

p_{H_2}=728torr

Thus the pressure that the H_2(g) produced in the reaction would have if it were dry will be 728 torr

3 0
3 years ago
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