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NemiM [27]
3 years ago
9

Sand dunes are created when the wind carrying the sand runs into an obstacle A. True B. False

Chemistry
1 answer:
Troyanec [42]3 years ago
3 0

A. True

They are formed behind an obstacle when the wind blows the sand up to it.

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Calculate the vapor pressure at 25 ?c of hexane above the solution. the vapor pressure of pure hexane at 25 ?c is 151 torr.
Studentka2010 [4]
One of the many ways in order to solve for the vapor pressure of pure components at a given temperature is through the Antoine's equation which is written below,
                                    P = 10^(A - B/C+T)
where A, B, and C are constants and T is the temperature in °C and P is the vapor pressure in mm Hg. 
For hexane,
                             A = 7.01
                             B = 1246.33
                             C = 232.988

Substituting the known values,
                            P = 10^(7.01 - 1246.33/232.988+25)
                             <em> P = 151.199 mm Hg</em>
8 0
3 years ago
A balloon filled with helium occupies 21.0ft³ at 55.0°F. Find the temperature of the helium if the volume of the balloon decreas
harkovskaia [24]

Answer:

Assuming pressure is held constant,the question reduces to a ratio and proportion type of question where;

At constant pressure,

21.0ft³-55.0°F

11.0fy³=11.0ft³/21.0ft³×55°F

The temperature is 28.809°F≈29°F

6 0
3 years ago
Why does half a mole of water molecules have more mass than 2 moles of helium atoms?
Fantom [35]

Answer:

everything (matter) is made up of molecules(atoms)

Explanation:

6 0
3 years ago
Read 2 more answers
As long as a substance ________, it is considered a physical change.
-BARSIC- [3]

Answer:

as long as a substance becomes a new substance it will be considered a physical change

7 0
2 years ago
Conduction, convection and radiation can occur in variety of ways. Give another example, like the campfire picture above, where
Lyrx [107]

Answer: Boiling water

Explanation:

4 0
3 years ago
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