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Aleksandr [31]
3 years ago
13

(just want to check my answer)

Chemistry
1 answer:
tresset_1 [31]3 years ago
6 0
<span>The answer is B) A precipitate is formed. In the reaction Ni(No3)2)aq) + K2S(aq) -> NiS(s) + 2KNO3(aq), nickel(II) sulfide (NiS) is solid substance as indexed (s) while KNO3 is dissolved in water presented as index (aq). Therefore, if the reaction is successful, a precipitate (the solid substance NiS) will be formed,</span>
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During the cold winter months the surface Of a lake becomes hard Ice this is due to which change of state
nikitadnepr [17]

Freezing

Explanation:

This change in state when surface of a lake changes to hard ice is known as freezing.

  • When a solid is heated, it melts and changes to a liquid. On further heating, it changes to vapor and the randomness increases.
  • When a liquid is cooled below its freezing point, it changes to a solid such as ice for water.
  • The phase change is known as freezing.

Learn more:

Phase change brainly.com/question/1875234

#learnwithBrainly

8 0
3 years ago
If you repeat an experiment and the result are very different from the result you got the first time the next step would be to w
Bess [88]
You would want to make sure that you have controlled the variables properly, and if you determine that you did then you would repeat the experiment to be sure of the results.
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3 years ago
The air you breathe is made of 21% oxygen and 78% nitrogen. The oxygen in air is the _____ and the nitrogen is the _____.
jarptica [38.1K]
The answer is solute, solvent 

<span>In a solution, a solute the component which is present in lesser amount while a solvent is present in greater amount.  </span>Since nitrogen is present in a greater amount than oxygen (78% > 21%), then the oxygen must be the solute and the nitrogen must be the solvent in the air.
5 0
3 years ago
What is the difference between 5.0 and 5.00??
insens350 [35]
The only difference between 5.0 and 5.00 is the that, 5.0 has 2 significant digits and 5.00 has 3
8 0
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If you put hydrogen (H1+) and Hydroxide (OH1) together what it’s it called?
Tamiku [17]

Answer:

The hydroxyl ions (OH-) released will combine with any hydrogen ions (H+) in the solution to form water molecules (OH- + H+ = H2O).

Explanation:

3 0
3 years ago
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