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Scrat [10]
3 years ago
5

Insoluble sulfide compounds are generally black in color.

Chemistry
1 answer:
AfilCa [17]3 years ago
5 0
<h3>Answer:</h3>

Li₂S(aq)+Pb(NO₃)₂(aq) → PbS(s) + LiNO₃(aq)

K2S(aq)+Sn(NO₃)₄(aq→ SnS(s) + KNO₃(aq)

<h3>Explanation:</h3>
  • According to solubility rules, metal sulfides are insoluble except Calcium sulfide(CaS), Magnesium sulfide(MgS), Barium sulfide(BaS), and those of potassium, sodium, and ammonium.
  • Therefore, when all the other sulfides are formed during a reaction they form a precipitate that is shown to be in solid-state.
  • Precipitates are formed during precipitation reactions when cations and anions combine to form a compound that is insoluble in water.

In our case; In the equations given, some reactions will take place to form a precipitate while others will not occur.

That is;

  • Na₂S(aq)+KCl(aq) → No reaction
  • Li₂S(aq)+Pb(NO₃)₂(aq) → PbS(s) + LiNO₃(aq)
  • Pb(ClO₃)₂(aq)+NaNO₃(aq) → No reaction
  • AgNO₃(aq)+KCl(aq) →AgCl(s) + KNO₃(aq)
  • K2S(aq)+Sn(NO₃)₄(aq→ SnS(s) + KNO₃(aq)

The first reaction will not occur.

The second equation is a precipitation reaction that forms lead(ii)sulfide which is a black precipitate.

The third reaction will not take place.

The fourth reaction will be a precipitation reaction forming silver chloride precipitate.

The fifth equation is also a precipitation reaction that forms tin(ii) sulfide, SnS which is a black precipitate.

Therefore; the equations that answers our question are;

  • Li₂S(aq)+Pb(NO₃)₂(aq) → PbS(s) + LiNO₃(aq)
  • K2S(aq)+Sn(NO₃)₄(aq→ SnS(s) + KNO₃(aq)
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Gold forms face-centered cubic crystals. The atomic radius of a gold atom is 144 pm. Consider the face of a unit cell with the n
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Answer:

The length of an edge of this unit cell is 407.294 pm

Explanation:

Face centered cubic structure contains 4 atoms in each unit cell and 12 coordination number, occupying about 74% volume of the total cell. Face centered cubic structure is known for efficient use of space for atom packing.

To determine the edge length, a relationship between the radius of the atom and edge length is used.

X = R√8

Where;

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R is the radius of the gold atom = 144 pm = 144 X 10⁻¹² m

X = 144 X 10⁻¹²√8

X = 407.294 X 10⁻¹² m

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Therefore, the length of an edge of this unit cell is 407.294 pm

8 0
2 years ago
The nucleus of an atom consists of
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Answer:

The nucleus of an atom consists of Protons and Neutrons.-A.

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HELP PLEASE!!!!The graph below compares the volume occupied by 100 g of liquid water and 100 g of water vapor.
soldier1979 [14.2K]

Particles are farther apart in gases so substance X is water vapor

Explanation:

The best statement that fits the two described substances is that particles are farther apart in gases so substance X is water vapor. For a give mass of substance, gases occupies more volume.  

Gases do not have specific volumes, occupy space randomly and fills whichever container they are found in.  

Liquids on the other hand like solids have specific volume because their particles are very close together.  

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states of matter  brainly.com/question/10954198

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3 0
3 years ago
When 20 milliliters of 1.0m hcl is diluted to a total volume of 60 milliliters, the concentration of the resulting solution is?
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In preparing diluted solutions from concentrated solutions we can use the following formula
c1v1 = c2v2
c1 and v1 are the concentration and volume of the concentrated solution respectively
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Substituting these values ,
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3 years ago
When 1.00 g of boron is burned in o2(g) to form b2o3(s), enough heat is generated to raise the temperature of 733 g of water fro
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