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mina [271]
3 years ago
5

Justin Bleeber is conducting a calorimetry experiment in chemistry class. He fills an empty soda can with water and hangs it fro

m an iron ring. The can hangs above a cracker that is resting on a stand. Justin uses his striker to light a Bunsen burner. He uses the flame from the Bunsen burner to light a wooden splint. The wooden splint is used to ignite the cracker. As the cracker burns it heats up the water in the soda can. Waves of gas are seen coming out of the top of the can. How many chemical changes did Justin observe?
Chemistry
2 answers:
Elodia [21]3 years ago
4 0
<h2>Answer:</h2>

Justin Bleeber noticed almost 4 chemical changes while conducting his experiment with a soda can. He noticed chemical changes in cracker burns when it heats the water in a soda can. He observed the chemical change when the waves of the gas are seen coming out on the top of the can. He also observes changes while he uses the flame from Bunsen burner to light a wooden split.

baherus [9]3 years ago
4 0

The correct answer is 3 or three !!!

Why ?

Because : The burning of gas in the Bunsen burner, lighting of the splint, and ignition of the cracker are all chemical changes. The heating of the water is a physical change.

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Calculate the molarity of a solution prepared by diluting 7.0 mL of 4.0 M solution to a volume of 30 mL.
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Considering the definition of dilution, the molarity of a solution prepared by diluting 7.0 mL of 4.0 M solution to a volume of 30 mL is 0.93 mL.

<h3>What is diluion</h3>

First of all, you have to know that when it is desired to prepare a less concentrated solution from a more concentrated one, it is called dilution.

Dilution is the process of reducing the concentration of solute in solution, which is accomplished by simply adding more solvent to the solution at the same amount of solute.

In a dilution the amount of solute does not change, but as more solvent is added, the concentration of the solute decreases, as the volume (and weight) of the solution increases.

A dilution is mathematically expressed as:

Ci×Vi = Cf×Vf

where

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  • Vf: final volume

<h3>Molarity of the solution in this case</h3>

In this case, you know:

  • Ci= 4 M
  • Vi= 7 mL
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Replacing in the definition of dilution:

4 M× 7 mL= Cf× 30 mL

Solving:

(4 M× 7 mL)÷ 30 mL= Cf

<u><em>Cf= 0.93 mL</em></u>

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