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IrinaK [193]
2 years ago
10

A student claims that water's polarity is the reason it has a high specific heat.

Chemistry
1 answer:
Komok [63]2 years ago
8 0

Answer:

Perform research to see if other polar molecules have high specific heat

Explanation:

The specific heat of a substance is the amount of heat required to raise the temperature of a unit mass of the substance by 1°C.

In this question, the student is trying to establish a relationship between polarity and specific heat of substances. This claim can be tested by performing a research to see if other polar molecules have high specific heat.

If the research shows that a large number of other polar molecules  have high specific heat, then the claim is confirmed to be true.

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Assuming equal concentrations and complete dissociation, rank these aqueous solutions by their freezing points. nh4cl cobr3 k2so
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Answer: CoBr3 < K2SO4 < NH4 Cl

Justification:

1) The depression of the freezing point of a solution is a colligative property, which means that it depends on the number of particles of solute dissolved.

2) The formula for the depression of freezing point is:

ΔTf = i * Kf * m

Where i is the van't Hoof factor which accounts for the dissociation of the solute.

Kf is the freezing molal constant and only depends on the solvent

m is the molality (molal concentration).

3) Since, you are assuming equal concentrations and complete dissociation of the given solutes, the solute with more ions in the molecular formula will result  in the solution with higher depression of the freezing point (lower freezing point).

4) These are the dissociations of the given solutes:

a) NH4 Cl (s) --> NH4(+)(aq) + Cl(-) (aq) => 1 mol --> 2 moles

b) Co Br3 (s) --> Co(3+) (aq) + 3Br(-)(aq) => 1 mol --> 4 moles

c) K2SO4 (s) --> 2K(+) (aq) + SO4 (2-) (aq) => 1 mol --> 3 moles

5) So, the rank of solutions by their freezing points is:

CoBr3 < K2SO4 < NH4 Cl
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                         Hope this helped!ヾ(•ω•`)o❤

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