Answer: The change in volume will be 9.30 L
Explanation:
To calculate the new pressure, we use the equation given by Boyle's law. This law states that pressure is directly proportional to the volume of the gas at constant temperature.
The equation given by this law is:
where,
are initial pressure and volume.
are final pressure and volume.
We are given:
Putting values in above equation, we get:
The change in volume will be (44.3-35.0)L = 9.30 L
The answer is D) one unit of a balanced chemical equation
Number 2 is correct answers
Answer is: adding NaCl will lower the freezing point of a solution.
A solution (in this example solution of sodium chloride) freezes at a lower temperature than does the pure solvent (deionized water).
The higher the solute concentration (sodium chloride), freezing point depression of the solution will be greater.
Equation describing the change in freezing point:
ΔT = Kf · b · i.
ΔT - temperature change from pure solvent to solution.
Kf - the molal freezing point depression constant.
b - molality (moles of solute per kilogram of solvent).
i - Van’t Hoff Factor.
Dissociation of sodium chloride in water: NaCl(aq) → Na⁺(aq) + Cl⁻(aq).
Light rays from the sun only strikes the surface of the Earth facing it, and since the Earth is not flat, but geoid, or spherical, then there will always be places backing the light rays of the sun. Now, had the Earth not been rotating about its axis, the place facing the sun would forever remain facing the sun, likewise for the other part backing it. So, there would never be night for those living on the side of Earth facing the sun, and there would never be day for those backing it.
However, since the Earth rotates, then the part facing the sun would slowly move away from it, and the part of the sun backing it would slowly move towards it, causing night time for the former, and day time to the latter.
Now, the place once backing the sun, B, is now facing the sun, and the place once facing the sun, A, is now backing it. But since the Earth continuously rotates, then B would now be slowly inching away from the sun, and A would be slowly inching towards it.
Thus, causing night at B, and day at A, and thus the circle continues, until some external force slows the Earth's rotation to a halt.