Describe how phospholipids form a barrier between water inside the cell and water outside the cell.
2 answers:
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Answer:
a)
In Boyle's Law, the variable that remains constant is the absolute temperature of the gas.
In Charle's Law, the variable that remains constant is the pressure of the gas.
In Avogadro's Law, the variables that remain constant are pressure and temperature of the gas.
b)
In Boyle's Law, the variables involved are pressure and volume: the law states that for a fixed mass of ideal gas at constant temperature, the pressure of the gas is inversely proportional to the volume:
where p is the pressure of the gas and V the volume.
In Charle's Law, the variables involved are volume and temperature: the law states that for a fixed mass of ideal gas at constant pressure, the volume of the gas is directly proportional to the temperature:
where V is the volume of the gas and T the temperature.
In Avogadro's Law, the variables involved are the volume and the number of moles: the law states that for an ideal gas kept at constant pressure and temperature, the volume of the gas is directly proportional to the number of moles:
Where V is the volume of the gas and n the number of moles.
c)
See the graphs of the three Laws in attachment:
- First graph: Boyle's Law, which shows that the pressure of the gas is inversely proportional to the volume
- Second Graph: Charle's Law, which shows that the volume of the gas is directly proportional to the absolute temperature
- Third graph: Avogadro's Law, which shows that the volume of the gas is directly proportional to the number of moles of the gas
d)
Here we want to re-write the three laws by making V the subject.
For Boyle's law, we get:
For Charle's Law, we get:
For Avogadro's Law, we get:
Therefore, we see that the two laws that show a direct proportionality are Charle's Law and Avogadro's Law, while Boyle's Law shows an inverse proportionality between the two variables.
Answer: acceleration
a = 5.36 m/s²
Explanation: solution attached:
Convert first 60 mi/h to m/s
Use the formula for acceleration
a = vf - vi /t
Answer:
The solution's new volume is 1.68 L
Explanation:
Dilution is the procedure to prepare a less concentrated solution from a more concentrated one, and simply consists of adding more solvent. So, in a dilution the amount of solute does not vary, but the volume of the solvent varies.
In summary, a dilution is a lower concentration solution than the original.
The way to do the calculations in a dilution is through the expression:
Ci*Vi=Cf*Vf
where C and V are concentration and volume, respectively; and the i and f subscripts indicate initial and final respectively.
In this case, being:
- Ci= 7 M
- Vi= 0.60 L
- Cf= 2.5 M
- Vf=?
Replacing:
7 M*0.60 L= 2.5 M* Vf
Solving:
Vf= 1.68 L
<u><em>The solution's new volume is 1.68 L</em></u>