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Ainat [17]
3 years ago
9

Moth balls gradually vaporize, is this a physical change?

Chemistry
1 answer:
AlladinOne [14]3 years ago
3 0
Hey There!

No, this would be considered a chemical change. :)
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How does the number of molecules in 1 mol of oxygen compare with the number of molecules in 1 mol of nitrogen?
vfiekz [6]
The answer is C.) Each sample has the same number of molecules. 
4 0
3 years ago
Read 2 more answers
which of the following measurements represents the most matter? 3.5 kg 350 g 3.5 x 103 hg 3.5 x 104 cg
LiRa [457]
The measurement with the highest weight has more matter.  
We shall convert all expression to kg.  
350g to kg = 0.350 kg 
1 kg is equals 100000 cg 
Then x kg is equals 3.5 * 104 cg. 
Hence 3.5 * 10^4 cg = 0.35kg 
Also 1 kg equals 10 hg 
Then x kg equals 3.5 * 103 
So x = 350 kg. Hence 3.5 * 103 hg is the answer
4 0
3 years ago
If you evaporated 125 mL of a 3.5 M solution of iron(II) nitrite, how many moles of iron(II) nitrite would you recover?
Verizon [17]

Considering the definition of molarity, 0.4375 moles of iron(II) nitrite you would recover.

In order to find the moles of the solid that can be recovered from this solution, you need to use the definition of molarity.

<h3>Definition of molarity</h3>

Molar concentration or molarity is a measure of the concentration of a solute in a solution and indicates the number of moles of solute that are dissolved in a given volume.

The molarity of a solution is calculated by dividing the moles of solute by the volume of the solution:

Molarity=\frac{number of moles}{volume}

Molarity is expressed in units \frac{moles}{liters}.

Moles of iron(II) nitrite

In this case, you evaporated 125 mL of a 3.5 M solution of iron(II) nitrite​. Then you know:

  • Molarity= 3.5 M
  • number of moles= ?
  • volume= 125 mL= 0.125 L (being 1000 mL= 1 L)

Replacing in the definition of molarity:

3.5 M=\frac{number of moles}{0.125 L}

Solving:

number of moles= 3.5 M× 0.125 L

<u><em>number of moles= 0.4375 moles</em></u>

Finally, 0.4375 moles of iron(II) nitrite you would recover.

Learn more about molarity:

brainly.com/question/9324116

brainly.com/question/10608366

brainly.com/question/7429224

3 0
2 years ago
Based on my previous question.. What is the op for acid in this experiment? ​
maria [59]

Answer:

Acid is a substance which water solution turns blue litmus paper to a red color.

Explanation:

The operational definition means what acid did in the experiment.

Acid is a substance which water solution turns blue litmus paper to red color.

3 0
3 years ago
All stars evolve the same up through the red giant phase. What determines the life cycle path a star will take from there?
ELEN [110]

Answer:

the star’s mass

Explanation:

the bigger the mass, the different lifestyle it will go through, our star will swell into a red giant then shed its outer layers until its a white dwarf then fade into a burned out cinder core.

4 0
2 years ago
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