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Maslowich
3 years ago
8

An atom has 25 protons, 30 neutrons, and 25 electrons. What is the charge of the

Chemistry
1 answer:
Alexandra [31]3 years ago
5 0
I am not sure but i think the first option is the correct answer
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A solution contains 0.036 M Cu2+ and 0.044 M Fe2+. A solution containing sulfide ions is added to selectively precipitate one of
Ratling [72]

Answer:

The precipitate is CuS.

Sulfide will precipitate at  [S2-]= 3.61*10^-35 M

Explanation:

<u>Step 1: </u>Data given

The solution contains 0.036 M Cu2+ and 0.044 M Fe2+

Ksp (CuS) = 1.3 × 10-36

Ksp (FeS) = 6.3 × 10-18

Step 2:  Calculate precipitate

CuS → Cu^2+ + S^2-         Ksp= 1.3*10^-36

FeS → Fe^2+ + S^2-      Ksp= 6.3*10^-18

Calculate the minimum of amount needed to form precipitates:

Q=Ksp

<u>For copper</u>  we have:  Ksp=[Cu2+]*[S2-]

Ksp (CuS) = 1.3*10^-36 = 0.036M *[S2-]

[S2-]= 3.61*10^-35 M

<u>For Iron</u>  we have: Ksp=[Fe2+]*[S2-]

Ksp(FeS) = 6.3*10^-18 = 0.044M*[S2-]

[S2-]= 1.43*10^-16 M

CuS will form precipitates before FeS., because only 3.61*10^-35 M Sulfur Ions are needed for CuS. For FeS we need 1.43*10^-16 M Sulfur Ions which is much larger.

The precipitate is CuS.

Sulfide will precipitate at  [S2-]= 3.61*10^-35 M

3 0
3 years ago
Several scientists from different countries are asked to examine the results of an experiment before a journal will print it. Wh
maxonik [38]

Answer:

Peer Review

Explanation:

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DNA is one and Grow and Develop i think i could be wong  let me know i can read up on it some more


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Faraday's law calculates how many amperes are generated. True or false?
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Hmm well thinking of how amperes are generated it should be true
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True or false? The formation of a new state of matter is evidence of a chemical reaction
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Answer: true

Explanation: i think its true

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