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Lorico [155]
3 years ago
7

Which one is NOT true about chemical changes? *

Chemistry
2 answers:
sukhopar [10]3 years ago
6 0

Answer:

The second answer

Explanation:

Phase changes is an example of physical change because it only changes the substance's appearance.

Natali5045456 [20]3 years ago
3 0

Answer: 1 and 4 are the answers

Explanation: because when you mix a sub since and it will have a chemical change

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3 years ago
Why wouldn’t you use Avogadro’s number to change 32.4 grams of Lithium into moles of Lithium?
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3 years ago
A 13.5 g sample of an unknown gas occupies 5.10 L at 149.83 kPa and 301 K. What is the molar mass of the gas ?
alisha [4.7K]

Answer:

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Assuming the gas is behaving as an ideal gas

\textrm{PV} =\textrm{nRT} \\\textrm{PV} = \displaystyle \frac{m}{M}\textrm{ RT } \\1.48 \textrm{ atm}\times 5.10 \textrm{ L} = \displaystyle \frac{13.5 \textrm{ g}}{M}\times 0.0821 \textrm{ L.atm.mol}^{-1}.K^{-1}\times 301\textrm{K} \\M = 44.19 \textrm{ g/mol}

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