The visible constellations<span> are definitely different
between the Northern and Southern Hemispheres. In general, at any given point
on Earth, only around 50% of the sky will be visible. We can understand this by
considering the atmosphere as a sphere around the earth. The sky any person can
view at one point can be compared to a giant dome equal to half of the sphere.
And because the Earth rotates, the dome we can see changes, unless one is
sitting directly on the North or South Pole.</span>
it's the last one because it's depended on the rock layers
<span>A colloid can be detected by using the Tyndall effect. The correct option among all the options that are given in the question is the second option. The other choices are incorrect and can be easily neglected. I hope that this is the answer that you were looking for and the answer has actually come to your desired help.</span>
The expected freezing point of the solution is -12.01 °C
<h3>What is the freezing point of a substance?</h3>
The freezing point of a substance is the temperature at which a liquid changes to a solid.
When solutes are dissolved in solvents, they depress the freezing point of the solvent.
The expected freezing point of the solution is calculated using the formula;
where:
- ΔT = freezing point depression
- K = Freezing point constant
- m = molality of the solution
- i = Van't Hoff factor
For water, K = 1.86 ∘c/m
molality of solution = moles of solute/ mass of water in Kg
moles of NaCl = 85/58.5 = 1.453 moles
mass of water in kg = 450/1000 = 0.45
molality of solution = 1.453 / 0.45
molality of solution = 3.23 molal
i = 2
ΔT = 1.86 × 3.23 × 2
ΔT = 12.01
Freezing point of solution = Freezing point of water - ΔT
Freezing point of solution = 0 - 12.01
Freezing point of solution = -12.01 °C
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