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grigory [225]
3 years ago
15

Which of the following is an example of a hypothesis?

Chemistry
2 answers:
Marrrta [24]3 years ago
7 0

Answer: A). a prediction that a tire's air pressure will increase if the tire's temperature is raised

Explanation:

A hypothesis is a proposed explanation for a phenomenon. For a hypothesis to be a scientific hypothesis, the scientific method requires that one can test it. Scientists generally base scientific hypotheses on previous observations that cannot satisfactorily be explained with the available scientific theories.

A hypothesis can be define as the presumed or predicted statement for a natural phenomena which is required to be testified by using suitable experimental methodology or observatory approaches.

A). a prediction that a tire's air pressure will increase if the tire's temperature is raised. is the correct answer this is because of the fact that the statement involves a prediction that can be proved by using suitable experimental methodology.

nevsk [136]3 years ago
5 0
The answer would be A.
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This is my own explanation:

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What is more soluble, ammonium chloride or sodium chloride?
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Answer:

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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.

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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
4 0
3 years ago
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Answer:

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Explanation:

Hope it helps! :)

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2 years ago
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