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Elena L [17]
3 years ago
13

SCIENCEEEE!!!!! HELPPPP!!!!

Chemistry
2 answers:
Wittaler [7]3 years ago
7 0

Answer:

I would say Both are only physical changes.

Explanation:

Melting wax isn't creating a new substance, or changing the atomic structure. The wax is only changes from a solid to a liquid state. Sanding a piece if wood is usually done with sandpaper, which can physically be done with your hands. Hope this helped :)

IRINA_888 [86]3 years ago
5 0

pretty sure it's both are physical changes.

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According to Avogadro's Law, same volume of any gas at standard temperature and pressure will occupy same volume. And one mole of any Ideal gas occupies 22.4 dm³ (1 dm³ = 1 L).

Data Given:

                  n = moles = ?
                  V = Volume = 16.8 L

Solution:
               
As 22.4 L volume is occupied by one mole of gas then the 16.8 L of this gas will contain....

                           = ( 1 mole × 16.8 L) ÷ 22.4 L
                    
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Result:
           
16.8 L of Nitrogen gas will contain 0.75 moles at standard temperature and pressure.
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