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Snowcat [4.5K]
2 years ago
12

3. Given the reaction:

Chemistry
1 answer:
sesenic [268]2 years ago
3 0

Answer:

Attached

Explanation:

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Which solute would be more effective at lowering the freezing point of water: MgCl2 and KNO3? Explain.
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Answer:

AlCl₃.

Explanation:

Adding solute to water causes depression of the boiling point.

The depression in freezing point (ΔTf) can be calculated using the relation:

ΔTf = i.Kf.m,

where, ΔTf is the depression in freezing point.

i is the van 't Hoff factor.

van 't Hoff factor is the ratio between the actual concentration of particles produced when the substance is dissolved and the concentration of a substance as calculated from its mass. For most non-electrolytes dissolved in water, the van 't Hoff factor is essentially 1.

Kf is the molal depression constant of water.

m is the molality of the solution (m = 1.0 m, for all solutions).

(1) NaCl:

i for NaCl = no. of particles produced when the substance is dissolved/no. of original particle = 2/1 = 2.

∴ ΔTb for (NaCl) = i.Kb.m = (2)(Kf)(1.0 m) = 2(Kf).

(2) MgCl₂:

i for MgCl₂ = no. of particles produced when the substance is dissolved/no. of original particle = 3/1 = 3.

∴ ΔTb for (MgCl₂) = i.Kb.m = (3)(Kf)(1.0 m) = 3(Kf).

(3) NaCl:

i for KBr = no. of particles produced when the substance is dissolved/no. of original particle = 2/1 = 2.

∴ ΔTb for (KBr) = i.Kb.m = (2)(Kf)(1.0 m) = 2(Kf).

(4) AlCl₃:

i for AlCl₃ = no. of particles produced when the substance is dissolved/no. of original particle = 4/1 = 4.

∴ ΔTb for (CoCl₃) = i.Kb.m = (4)(Kf)(1.0 m) = 4(Kf).

So, the ionic compound will lower the freezing point the most is: AlCl₃

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Recall that the value of K is small for reactions that form very little product. Reactions that form very little product are sai
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Answer:

Reversible reaction

Explanation:

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Sulfide would be an AWNSER but
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Answer:

In an earthquake, the initial seismic energy wave is called a primary wave. It compresses the material ahead of it; other types of subsequent waves travel in sideways and up-and-down motions. A primary wave travels at different speeds depending on what type of substance it is traveling through. In order to determine how long it will take to travel 2,000 km we have to do the math, using the speed in km/sec and setting up proportions. In a solid such as rock, the primary wave can travel at 5 km/sec; it would take 400 seconds, or about 6.7 minutes to travel 2,000 km. If traveling through water, the wave travels at about 1.45 km/sec and would need 1,379 seconds (23 minutes) to travel 2,000 km. Primary waves traveling through air travel at the speed of sound (.34 km/sec), and would take 5,882 seconds (98 minutes) to travel 2,000 km.

Explanation:

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