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3 years ago

Which of the following is not a phase change?

Chemistry

1 answer:

sweet [91]3 years ago

6 0

C. Diffusion is not a phase change.

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Think about all that your feet do. They walk

Burka [1]

Answer:

squamous cells

basal cells

and melanocytes

7 0

3 years ago

How do you balance C6H12O6 + O2 --> CO2 + H2O?

Contact [7]

C6H12O6 + O2 --> CO2 +H2O 

In the balancede form we have: 

C6H12O6 + 6O2 ---> 6CO2 + 6H2O 

C -6 , H -12 and O - 18 
in both sides.

3 0

4 years ago

The partial pressure of CH4 is 0.175 atm and that of O2 is 0.250 atm in a mixture of the two gases. What is the mole fraction of

tresset_1 [31]

Answer:

The total number of moles of gas in the mixture is 0.16939.

1.25550 grams of methane gas and 3.18848 grams of oxygen gas.

Explanation:

Total volume of the mixture = V = 10.5 L

Temperature of the mixture = T = 35°C = 308.15K

Pressure of the mixture = P

Total moles of mixture = n = $n_1+n_2$

Using an ideal gas equation :

$PV=nRT$

$P\times 10.0 L=n\times 0.0821 atm L/mol K\times 308.15 K$

$P=2.509 n$

Partial pressure of the methane= $p_1=0.175 atm$

Moles of the methane= $n_1$

Partial pressure of the oxygen gas= $p_2=0.250 atm$

Moles of the methane= $n_2$

Mole fraction of the methane= $\chi_1=\frac{n_1}{n_1+n_2}$

Mole fraction of the oxygen gas= $\chi_2=\frac{n_2}{n_1+n_2}$

$p_1=p\times \chi_1$ (Dalton's law)

$0.175 atm=P\times \frac{n_1}{n_1+n_2}$

$0.175 atm=(2.509 n)\times \frac{n_1}{n}$

$n_1=0.06975 mol$

Mass of 0.06975 moles of methane gas :

0.06975 mol × 18 g/mol =1.25550 g

$p_2=p\times \chi_2$ (Dalton's law)

$0.250 atm=P\times \frac{n_2}{n_1+n_2}$

$0.250 atm=(2.509 n)\times \frac{n_2}{n}$

$n_2=0.09964 mol$

Mass of 0.06975 moles of oxygen gas :

0.09964 mol × 32 g/mol =3.18848 g

Total moles of mixture = n = $n_1+n_2$

[/tex]=0.06975 mol+0.09964 mol=0.16939 mol[/tex]

7 0

3 years ago

Select the correct statement to describe when a sample of liquid water vaporizes into water vapor.

UNO [17]

The answer is a am sure

8 0

4 years ago

0.50 mole of KCI, a strong electrolyte, is added to 2.0kg of water. The boiling point of the solution will be _____ the boiling

steposvetlana [31]

Answer:

Higher than

Explanation:

The boiling point of a solution is a colligative property

Atoms present ∝ Colligative Property (Boiling Point)

Since KCl is a strong electrolyte, it completely dissociates into K⁺ and Cl⁻ ions, which doubles the number of atoms as compared to what was initially added

Now it's competition is very weak, Pure water has nothing else dissolved in it. which means that our solution will have much higher boiling point as compared to Pure Water

5 0

3 years ago