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Georgia [21]
3 years ago
11

Phase changes are chemical changes. True False ...?

Chemistry
2 answers:
tekilochka [14]3 years ago
8 0
False
Phase changes are physical changes and can be easily reverted by adjusting pressure or temperature. 
marusya05 [52]3 years ago
5 0
Hi , the answer is false.
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Find the volume of a gas at STP, if its volume is 80.0 mL at 109 kPa and -12.5°C.​
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Answer:

= 913.84 mL

Explanation:

Using the combined gas laws

P1V1/T1 = P2V2/T2

At standard temperature and pressure. the pressure is 10 kPa, while the temperature is 273 K.

V1 = 80.0 mL

P1 = 109 kPa

T1 = -12.5 + 273 = 260.5 K

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V2 = ?

T2 = 273 K

Therefore;

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     = (109 kPa × 80 mL × 273 K)/(10 kPa× 260.5 K)

     <u>= 913.84 mL</u>

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