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trapecia [35]
3 years ago
8

Are these physical or chemical changes?

Chemistry
2 answers:
Mnenie [13.5K]3 years ago
6 0
Chemical i pretty sure! please do more searching if u think i’m wrong.
Darya [45]3 years ago
5 0
All are chemicalllllllll
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Question: which voice sings lowest in a SATB choir?

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When gas particles collide with a surface
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Answer: A woman kicks a soccer ball and scores a goal.

Explanation:

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3 years ago
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At a given temperature the vapor pressure of pure liquid benzene and toluene are 745 torr and 290 torr, respectively. A solution
IRISSAK [1]

Answer:

Vapour pressure of benzene over the solution is 253 torr

Explanation:

According to Raoult's law for a mixture of two liquid component A and B-

vapour pressure of a component (A) in solution = x_{A}\times P_{A}^{0}

vapour pressure of a component (B) in solution = x_{B}\times P_{B}^{0}

Where x_{A},x_{B} are mole fraction of component A and B in solution respectively

P_{A}^{0},P_{B}^{0} are vapour pressure of pure A and pure B respectively

Here mole fraction of benzene in solution is 0.340 and vapour pressure of pure benzene is 745 torr

So, vapour pressure of benzene in solution = 0.340\times 745 torr

                                                                         = 253 torr

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