04.09.2021

The freezing point of water is zero

. 5

Faq

Chemistry
Step-by-step answer
P Answered by PhD
Correct Option g: adding salt to water lowers its freezing point

Reason:
Freezing point is a colligative property. When a non-volatile solution is present in solution, it's freezing point decreases. This is referred as depression in freezing point (ΔTf). Extent of lowering in freezing point is dependent on number of particles present in system. Mathematically it is expressed as:

ΔTf = Kf X m

where, m = molality of solution
Kf = cryoscopic constant. 

Hence, adding salt to water lowers the freezing point of solution. 
Chemistry
Step-by-step answer
P Answered by PhD
Correct Option g: adding salt to water lowers its freezing point

Reason:
Freezing point is a colligative property. When a non-volatile solution is present in solution, it's freezing point decreases. This is referred as depression in freezing point (ΔTf). Extent of lowering in freezing point is dependent on number of particles present in system. Mathematically it is expressed as:

ΔTf = Kf X m

where, m = molality of solution
Kf = cryoscopic constant. 

Hence, adding salt to water lowers the freezing point of solution. 
Biology
Step-by-step answer
P Answered by PhD

D) The addition of different substances affects the freezing point of water.

Explanation:

The best answer would be letter D.

The short explanation would be, the other choices only involves the addition of 1 substance (salt or sugar).

The long explanation:

Susie is testing two types of solution: sugar + water and salt + water.  This means that she is testing the effect of both. An experiment is done to test certain variables and an addition of a variable that is not being tested is not advisable. But since she intentionally used both solutions, then it is reason enough to assume that she is testing both substances (sugar and salt) so the hypothesis should include both as well.

Chemistry
Step-by-step answer
P Answered by Specialist
The answer is
The ocean water will have a lower freezing point.

distilled water is 0 °C
ocean water is -1.33°C

Because the solute in the sea water decrease the freezing point
Chemistry
Step-by-step answer
P Answered by Master

The freezing point of water will be lowered 3°C

Explanation:

Remember that molality is generally the standard for calculating the concentration, between molarity and molality. In this question we have to apply molality, given the units as moles and kilograms.

We can start by receiving the molality of this solution through the following formula...

\mathrm{m}=\mathrm{(mass}\mathrm{/molar\:mass)} * (1000/\mathrm{mass\:of\:solvent)},

\mathrm{m} =\mathrm{(400.0 g / 62.07 g/mol) * (1000 / 4000.0 g)},

\mathrm{m} = (400/62.07) * (1000 / 4000) = \left(\frac{400}{62.07}\right)\left(\frac{1000}{4000}\right) = \frac{1000}{620.7} = 1.61108\dots\mathrm{m}

Now we can determine how much the freezing point of water will be lowered, given that the freezing-point depression constant for water is Kf= –1.86°C/m. Remember that " Kf " is the final temperature, so to determine how much the temperature of the water will decrease, we can note the change in temperature...

\mathrm{change\:in\:temperature} = ( - 1.86\mathrm{C/m})(1.61\mathrm{m}) = - 1.86 * 1.61 = -2.9946

-2.9946 = \mathrm{About\:-3C}

Hence the freezing point of water will be lowered 3°C.

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