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Pani-rosa [81]
2 years ago
13

Martin slowly pours an unknown liquid into a container that originally had some water in it. He is measuring the temperature in

the container as he does this.
The temperature in the container rises very fast.


What kind of change is likely to be happening in the container?
A chemical change.

A physical change.

Both a chemical and a physical change.

Neither a chemical nor a physical change.
Chemistry
1 answer:
S_A_V [24]2 years ago
7 0

Answer:

A chemical change.

Explanation:

As the temperature rises fast, the kind of change that can be said to be occurring is a chemical change.

One of the way to know of a chemical change is occurring is that new kinds of  matter is formed and also, there is either an evolution or absorption of heat energy in the process.

Since heat is liberated in this change, an exothermic chemical reaction is taking place.

So this is a chemical change.

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Answer:

See explanation

Explanation:

For a substance to dissolve in another, there must be some sort of interaction between the substances.

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2 years ago
A sample of 19 mg of 9-fluorenone is dissolved in 5 mL of diethyl ether. The resulting organic
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Answer:

15.70mg would remain

Explanation:

Partition coefficient is used to extract or purify a solute from a solvent selectively to avoid interference from other substances. For the problem, formula is:

Kp = Concentration 9-fluorenone in ether / Concentration of solute in H₂O

After the solute, 9-fluorenone, is extracted with water, the mass that remains in ether is:

(19mg - X)

<em>Where X is the mass that now is in the aqueous phase</em>

Replacing in Kp formula:

9.5 = (19mg - X) / 5mL / (X /10mL)

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X = 3.30mg

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19mg - 3.30mg =

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